CM-FX6: Linux: Kernel

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Overview

The Linux kernel for the CompuLab CM-FX6 System-on-Module / Computer-on-Module provides support for on-board peripherals and abstracts the functionality provided by the hardware.
Current support coverage is specified at O/S support coverage map page.
CompuLab provides ready-to-run binary kernel images, and source code of the modifications and additions made to the Linux kernel to work properly with CM-FX6 modules.

Building kernel for CM-FX6

Admolition note.png The instructions below assume that the /home/development/CM-FX6 directory has been created for CM-FX6 kernel development.

Getting kernel sources

Linux git tree can be cloned or downloaded as a tarball from Freescale public git repository.

Snapshot download

cd /home/development/CM-FX6
wget http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/snapshot/linux-2.6-imx-rel_imx_4.1.15_1.1.0_ga.tar.bz2
tar -xvf linux-2.6-imx-rel_imx_4.1.15_1.1.0_ga.tar.bz2
mv linux-2.6-imx-rel_imx_4.1.15_1.1.0_ga kernel
  • Apply the CM-FX6 patch.
cd /home/development/CM-FX6/kernel
patch -p1 < /path/to/CM-FX6/kernel/linux-4.1.15-cm-fx6-8.0.patch

Git clone

  • Install git version control system.
  • Create a clone of the CM-FX6 Linux kernel tree
cd /home/development/CM-FX6/
git clone git://git.freescale.com/imx/linux-2.6-imx.git
mv linux-2.6-imx kernel
cd /home/development/CM-FX6/kerel
  • Apply the CM-FX6 patch. Create a development branch and apply CompuLab patches.
git checkout -b development rel_imx_4.1.15_1.1.0_ga
git am /home/development/CM-FX6/kernel/patches/*.patch

Building the kernel

export ARCH=arm
export CROSS_COMPILE=arm-none-linux-eabi-
export DTB=$(ls -al arch/arm/boot/dts | awk '(/fx6.*dts$/)&&($0=$NF)&&(gsub(/dts/,"dtb"))' ORS=" ")
make cm_fx6_defconfig
make menuconfig
make zImage modules ${DTB} && INSTALL_MOD_PATH=/home/development/CM-FX6/rootfs make modules_install

In the example above:

  • Linux kernel image (zImage) will be created in /home/development/CM-FX6/kernel/arch/arm/boot
  • device tree blobs will be created in /home/development/CM-FX6/kernel/arch/arm/boot/dts
  • loadable kernel modules will be installed into the /home/development/CM-FX6/rootfs/lib/modules directory.

When the CM-FX6 is booted with the kernel image created as described above and with networked root filesystem at /home/development/CM-FX6/rootfs/, the system will be able to load the kernel modules properly, thus avoiding module version problems.

zImage, DTB files and modules locations

  • In the example above, the Linux kernel image (zImage) will be created in the /home/development/CM-FX6/kernel/arch/arm/boot directory.
ls -al /home/development/CM-FX6/kernel/arch/arm/boot/zImage
  • DTB files
ls -al /home/development/CM-FX6/kernel/arch/arm/boot/dtb/*fx6*.dtb
  • The loadable kernel modules will be installed into the /home/development/CM-FX6/rootfs/lib/modules directory.
ls -al /home/development/CM-FX6/rootfs/lib/modules

Kernel Version

  • In the example above, the Linux kernel release version number will be saved in /home/development/CM-FX6/kernel/include/config/kernel.release
cat /home/development/CM-FX6/kernel/include/config/kernel.release

Prepare kernel and modules tarball

  • In the example below, the Linux kernel and modules are packed into the tar archive for deploying onto the CM-FX6.
mkdir -p /home/development/CM-FX6/rootfs/boot
cp -v /home/development/CM-FX6/kernel/arch/arm/boot/zImage /home/development/CM-FX6/rootfs/boot/zImage-cm-fx6
cp -v /home/development/CM-FX6/kernel/arch/arm/boot/dtb/*fx6*.dtb /home/development/CM-FX6/rootfs/boot/
tar -C /home/development/CM-FX6/rootfs -czvf /home/development/CM-FX6/linux-image-CM-FX6.tar.gz .

Basic platform support

The CM-FX6 basic platform support is implemented in the arch/arm/boot/dts/*fx6* files of the Linux kernel source tree.

These files contain:

  • default setup of multi-functional pins;
  • registration of the devices integrated in the CM-FX6 module;
  • definitions of platform-specific configuration for these devices.

Deploying the CM-FX6 kernel and modules

Boot up the CM-FX6 computer. Copy the previously created linux-image-CM-FX6.tar.gz to /root directory of the CM-FX6.

Mount boot partition

  • Use the below command to mount the boot partition for installing the CM-FX6 Linux kernel binary:
boot_partition=$(awk '!/nfs/ { for (i=1;i<=NF;i++) { if($i~/^root=/) { print substr($i,6,length($i)-6)"1" } } }' /proc/cmdline)
mount $boot_partition /boot

Back up old kernel

  • It is essential to backup the old (known to work) kernel binary.
mkdir /boot/$(uname -r)
mv /boot/uImage-cm-fx6 /boot/zImage-cm-fx6 /boot/*.dtb /boot/$(uname -r)/

Installing kernel and modules

Assuming that the linux-image-CM-FX6.tar.gz tar ball has been copied to the CM-FX6 /root directory.

  • Extract and install the Linux kernel binary:
tar -C / -xvf /root/linux-image-CM-FX6.tar.gz

U-Boot Environment

Common parameters

setenv loadaddr 0x10800000
setenv dtbaddr  0x15000000
setenv bootm_low 0x15000000
setenv zimage zImage-cm-fx6
setenv console console=ttymxc3,115200
setenv rootopt rootfstype=ext4 rw rootwait
setenv netopt ip=dhcp
  • SB-FX6 (Evaluation Board)

In order to boot up an SB-FX6 make use of the imx6q-sbc-fx6.dtb blob file.

setenv dtb imx6q-sbc-fx6.dtb

In order to boot up an SB-FX6m make use of the imx6q-sbc-fx6m.dtb blob file.

  • SB-FX6m (Utilite)
setenv dtb imx6q-sbc-fx6m.dtb

SATA Boot Parameters

setenv satadev 0
setenv rootdev root=/dev/sda2

sata init
fatload sata ${satadev} ${loadaddr} ${zimage}
fatload sata ${satadev} ${dtbaddr} ${dtb}

setenv bootargs ${console} ${rootdev} ${rootopt} ${netopt}
bootz ${loadaddr} - ${dtbaddr}

MMC Boot Parameters

setenv mmcdev 2
setenv rootdev root=/dev/mmcblk2p2

mmc dev ${mmcdev}
fatload mmc ${mmcdev} ${loadaddr} ${zimage}
fatload mmc ${mmcdev} ${dtbaddr} ${dtb}

setenv bootargs ${console} ${rootdev} ${rootopt} ${netopt}
bootz ${loadaddr} - ${dtbaddr}

NFS Boot Parameters

setenv nfsserver <nfs server ip address>
setenv tftpserver <tftp server ip address>
setenv rootdev root=/dev/nfs rw

dhcp
tftpboot ${loadaddr} ${tftpserver}:${zimage}
tftpboot ${dtbaddr} ${tftpserver}:${dtb}

setenv bootargs ${console} ${rootdev} nfsroot=${nfsserver}:${nfsroot} ${netopt}
bootz ${loadaddr} - ${dtbaddr}

Kernel configuration

System Support

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> System Type > Freescale i.MX family

Enable:

  • i.MX6 Quad/DualLite support
  • CompuLab CM-FX6 Support
 ┌──────────────────────────────────────────────── Freescale i.MX family ────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      --- Freescale i.MX family                                                                    │ │  
 │ │                            *** Device tree only ***                                                               │ │  
 │ │                      [ ]   i.MX50 support                                                                         │ │  
 │ │                      [ ]   i.MX51 support                                                                         │ │  
 │ │                      [*]   i.MX53 support                                                                         │ │  
 │ │                      [*]   i.MX6 Quad/DualLite support                                                            │ │  
 │ │                      [*]   i.MX6 SoloLite support                                                                 │ │  
 │ │                      [ ]   i.MX6 SoloX support                                                                    │ │  
 │ │                      [ ]   i.MX6 UltraLite support                                                                │ │  
 │ │                      [ ]   i.MX7 Dual support                                                                     │ │  
 │ │                      [*]   Vybrid Family VF610 support                                                            │ │  
 │ │                              Clocksource for scheduler clock (Use ARM Global Timer)  --->                         │ │  
 │ │                      [ ]   Freescale LS1021A support                                                              │ │  
 │ │                      [*]   CompuLab CM-FX6 Support                                                                │ │  
 │ │                                                                                                                   │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

Bus Support

PCIE

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Bus support > PCI host controller drivers

Enable:

  • Freescale i.MX6 PCIe controller
 ┌───────────────────────────────────────────── PCI host controller drivers ─────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      [*] Freescale i.MX6 PCIe controller                                                          │ │  
 │ │                      [ ]   Enable pcie compliance tests on imx6                                                   │ │  
 │ │                      [ ]   PCI Express EP mode in the IMX6 RC/EP interconnection system                           │ │  
 │ │                      [ ]     PCI Express RC mode in the IMX6 RC/EP interconnection system                         │ │  
 │ │                      [ ] Generic PCI host controller                                                              │ │  
 │ │                      [ ] Freescale Layerscape PCIe controller                                                     │ │  
 │ │                      < > Broadcom iProc PCIe controller                                                           │ │  
 │ │                                                                                                                   │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

I2C

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > I2C support > I2C Hardware Bus support

Enable:

  • IMX I2C interface
 ┌────────────────────────────────────────────── I2C Hardware Bus support ───────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                          *** I2C system bus drivers (mostly embedded / system-on-chip) ***                        │ │  
 │ │                      < > CBUS I2C driver                                                                          │ │  
 │ │                      < > Synopsys DesignWare Platform                                                             │ │  
 │ │                      < > Synopsys DesignWare PCI                                                                  │ │  
 │ │                      < > GPIO-based bitbanging I2C                                                                │ │  
 │ │                      <*> IMX I2C interface                                                                        │ │  
 │ │...................................................................................................................│ │  
 │ │                          *** Other I2C/SMBus bus drivers ***                                                      │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘  

SPI

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > SPI support

Enable:

  • Freescale i.MX SPI controllers
 ┌───────────────────────────────────────────────────── SPI support ─────────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      --- SPI support                                                                              │ │  
 │ │                      [ ]   Debug support for SPI drivers                                                          │ │  
 │ │                            *** SPI Master Controller Drivers ***                                                  │ │  
 │ │                      < >   Altera SPI Controller                                                                  │ │  
 │ │                      -*-   Utilities for Bitbanging SPI masters                                                   │ │  
 │ │                      < >   Cadence SPI controller                                                                 │ │  
 │ │                      < >   GPIO-based bitbanging SPI Master                                                       │ │  
 │ │                      <*>   Freescale i.MX SPI controllers                                                         │ │  
 │ │                            *** SPI Protocol Masters ***                                                           │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

SATA

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > Serial ATA and Parallel ATA drivers (libata)

Enable:

  • AHCI SATA support
  • Platform AHCI SATA support
  • Freescale i.MX AHCI SATA support
 ┌──────────────────────────────────── Serial ATA and Parallel ATA drivers (libata) ─────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      --- Serial ATA and Parallel ATA drivers (libata)                                             │ │  
 │ │                      <*>   AHCI SATA support                                                                      │ │  
 │ │                      <*>   Platform AHCI SATA support                                                             │ │  
 │ │                      <*>   Freescale i.MX AHCI SATA support                                                       │ │  
 │ │                                *** SATA SFF controllers with BMDMA ***                                            │ │  
 │ │                      < >       Intel ESB, ICH, PIIX3, PIIX4 PATA/SATA support                                     │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ 

USB

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > USB support

Enable:

  • Support for Freescale i.MX on-chip EHCI USB controller
  • Generic EHCI driver for a platform device
 ┌───────────────────────────────────────────────────── USB support ─────────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                              *** USB Host Controller Drivers ***                                                  │ │  
 │ │                      <*>     Support for Freescale i.MX on-chip EHCI USB controller                               │ │  
 │ │                      <*>     Generic EHCI driver for a platform device                                            │ │  
 │ │...................................................................................................................│ │
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

MMC/SD/SDIO

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > MMC/SD/SDIO card support

Enable:

  • Secure Digital Host Controller Interface support
  • SDHCI platform and OF driver helper
  • SDHCI support for the Freescale eSDHC/uSDHC i.MX controller
 ┌────────────────────────────────────────────── MMC/SD/SDIO card support ───────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      --- MMC/SD/SDIO card support                                                                 │ │  
 │ │...................................................................................................................│ │
 │ │                      <*>   MMC block device driver                                                                │ │  
 │ │                      (8)     Number of minors per block device                                                    │ │  
 │ │                      [*]     Use bounce buffer for simple hosts                                                   │ │  
 │ │                      < >   SDIO UART/GPS class support                                                            │ │  
 │ │                      < >   MMC host test driver                                                                   │ │  
 │ │                            *** MMC/SD/SDIO Host Controller Drivers ***                                            │ │  
 │ │                      <*>   Secure Digital Host Controller Interface support                                       │ │  
 │ │                      < >     SDHCI support on PCI bus                                                             │ │  
 │ │                      <*>     SDHCI platform and OF driver helper                                                  │ │  
 │ │                      < >       SDHCI OF support for the Arasan SDHCI controllers                                  │ │  
 │ │                      <*>       SDHCI support for the Freescale eSDHC/uSDHC i.MX controller                        │ │  
 │ │...................................................................................................................│ │
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ 

NetWork

CAN

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Networking support > CAN bus subsystem support > CAN Device Drivers

Enable:

  • Support for Freescale FLEXCAN based chips
 ┌───────────────────────────────────────────────── CAN Device Drivers ──────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      < > Virtual Local CAN Interface (vcan)                                                       │ │  
 │ │...................................................................................................................│ │
 │ │                      <*>   Support for Freescale FLEXCAN based chips                                              │ │  
 │ │...................................................................................................................│ │
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ 

FEC/IGB

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > Network device support > Ethernet driver support

Enable:

  • Freescale devices
  • FEC ethernet controller (of ColdFire and some i.MX CPUs)
  • Intel devices
  • Intel(R) 82575/82576 PCI-Express Gigabit Ethernet support
 ┌─────────────────────────────────────────────── Ethernet driver support ───────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      [ ]   Faraday devices                                                                        │ │  
 │ │                      [*]   Freescale devices                                                                      │ │  
 │ │                      <*>     FEC ethernet controller (of ColdFire and some i.MX CPUs)                             │ │  
 │ │...................................................................................................................│ │  
 │ │                      [*]   Intel devices                                                                          │ │  
 │ │                      < >     Intel(R) PRO/100+ support                                                            │ │  
 │ │                      < >     Intel(R) PRO/1000 Gigabit Ethernet support                                           │ │  
 │ │                      < >     Intel(R) PRO/1000 PCI-Express Gigabit Ethernet support                               │ │  
 │ │                      <M>     Intel(R) 82575/82576 PCI-Express Gigabit Ethernet support                            │ │  
 │ │...................................................................................................................│ │
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘  

WiFi

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > Network device support > Wireless LAN

Enable:

  • Marvell WiFi-Ex Driver
  • Marvell WiFi-Ex Driver for SD8786/SD8787/SD8797/SD8887/SD8897
 ┌──────────────────────────────────────────────────── Wireless LAN ─────────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │...................................................................................................................│ │  
 │ │                      < >   ZyDAS ZD1211/ZD1211B USB-wireless support                                              │ │  
 │ │                      <M>   Marvell WiFi-Ex Driver                                                                 │ │  
 │ │                      <M>     Marvell WiFi-Ex Driver for SD8786/SD8787/SD8797/SD8887/SD8897                        │ │  
 │ │                      < >     Marvell WiFi-Ex Driver for PCIE 8766/8897                                            │ │  
 │ │...................................................................................................................│ │
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

Bluetooth

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Networking support > Bluetooth subsystem support > Bluetooth device drivers

Enable:

  • Marvell Bluetooth driver support
  • Marvell BT-over-SDIO driver
 ┌────────────────────────────────────────────── Bluetooth device drivers ───────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      < > HCI USB driver                                                                           │ │  
 │ │                      < > HCI SDIO driver                                                                          │ │  
 │ │                      < > HCI UART driver                                                                          │ │  
 │ │                      < > HCI BCM203x USB driver                                                                   │ │  
 │ │                      < > HCI BPA10x USB driver                                                                    │ │  
 │ │                      < > HCI BlueFRITZ! USB driver                                                                │ │  
 │ │                      < > HCI VHCI (Virtual HCI device) driver                                                     │ │  
 │ │                      <M> Marvell Bluetooth driver support                                                         │ │  
 │ │                      <M>   Marvell BT-over-SDIO driver                                                            │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘  

Multimedia

IPU

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

> Device Drivers > MXC support drivers Enable:

  • Image Processing Unit Driver
 ┌───────────────────────────────────────────────── MXC support drivers ─────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      [*] Image Processing Unit Driver                                                             │ │  
 │ │                          MXC Media Local Bus Driver  --->                                                         │ │  
 │ │                      < > i.MX IPUv3 prefetch engine                                                               │ │  
 │ │                          MXC Vivante GPU support  --->                                                            │ │  
 │ │                          MXC SIM Support  --->                                                                    │ │  
 │ │                          MXC MIPI Support  --->                                                                   │ │  
 │ │                          MXC VPU(Video Processing Unit) support  --->                                             │ │  
 │ │                          MXC HDMI CEC (Consumer Electronics Control) support  --->                                │ │  
 │ │                                                                                                                   │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘  

GPU

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > MXC support drivers > MXC Vivante GPU support

Enable:

  • MXC Vivante GPU support
 ┌─────────────────────────────────────────────── MXC Vivante GPU support ───────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      <M> MXC Vivante GPU support                                                                  │ │  
 │ │                                                                                                                   │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘  

VPU

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > MXC support drivers > MXC VPU(Video Processing Unit) support

Enable:

  • Support for MXC VPU(Video Processing Unit)
 ┌─────────────────────────────────────── MXC VPU(Video Processing Unit) support ────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      <*> Support for MXC VPU(Video Processing Unit)                                               │ │  
 │ │                      [ ]   MXC VPU debugging                                                                      │ │  
 │ │                      [ ]   MX6 VPU 352M                                                                           │ │  
 │ │                                                                                                                   │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘  

Frame buffer Devices

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

> Device Drivers > Graphics support > Frame buffer Devices Enable:

  • MXC Framebuffer support
  • Synchronous Panel Framebuffer
  • MXC MIPI_DSI
  • TRULY WVGA Panel
  • MXC LDB
  • MXC HDMI driver support
  • MXC EDID support
  • Hannstar CABC function
 ┌──────────────────────────────────────────────── Frame buffer Devices ─────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌──────────────────────^(-)─────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      < > AUO-K190X EPD controller support                                                         │ │  
 │ │                      <*> MXS LCD framebuffer support                                                              │ │  
 │ │                      [ ] Simple framebuffer support                                                               │ │  
 │ │                      <*> MXC Framebuffer support                                                                  │ │  
 │ │                      <*>   Synchronous Panel Framebuffer                                                          │ │  
 │ │                      <*>     MXC MIPI_DSI                                                                         │ │  
 │ │                      < >     MXC MIPI_DSI_SAMSUNG                                                                 │ │  
 │ │                      <*>     TRULY WVGA Panel                                                                     │ │  
 │ │                      <*>     MXC LDB                                                                              │ │  
 │ │                      <*>     MXC HDMI driver support                                                              │ │  
 │ │                      <*>   MXC EDID support                                                                       │ │  
 │ │                      <*> Si Image SII9022 DVI/HDMI Interface Chip                                                 │ │  
 │ │                      < > MXC DCIC                                                                                 │ │  
 │ │                      <*> Hannstar CABC function                                                                   │ │  
 │ │                      <*> E-Ink Panel Framebuffer                                                                  │ │  
 │ │                      < > E-Ink Panel Framebuffer based on EPDC V2                                                 │ │  
 │ │                      [ ] E-Ink Auto-update Mode Support                                                           │ │  
 │ │                      < > Solomon SSD1307 framebuffer support                                                      │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘  

Audio

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > Sound card support > Advanced Linux Sound Architecture > ALSA for SoC audio support > SoC Audio for Freescale CPUs

Enable:

  • SoC Audio support for i.MX boards with S/PDIF
  • SoC Audio support for i.MX boards with HDMI port
  • SoC Audio support for i.MX boards with WM8731
 ┌──────────────────────────────────────────── SoC Audio for Freescale CPUs ─────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                          *** Common SoC Audio options for Freescale CPUs: ***                                     │ │  
 │ │...................................................................................................................│ │  
 │ │                      <*> SoC Audio support for i.MX boards with S/PDIF                                            │ │  
 │ │                      <*> SoC Audio support for i.MX boards with HDMI port                                         │ │  
 │ │                      <*> SoC Audio support for i.MX boards with WM8731                                            │ │  
 │ │...................................................................................................................│ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ 

MXC MIPI

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > MXC support drivers > MXC MIPI Support

Enable:

  • MIPI CSI2 support
 ┌────────────────────────────────────────────────── MXC MIPI Support ───────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      <*> MIPI CSI2 support                                                                        │ │  
 │ │                                                                                                                   │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘  

MIPI Camera

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > Multimedia support > V4L platform devices > MXC Camera/V4L2 PRP Features support

Enable:

  • OmniVision ov5640 camera support using mipi
 ┌──────────────────────────────────────── MXC Camera/V4L2 PRP Features support ─────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      <M> OmniVision ov5640 camera support                                                         │ │  
 │ │                      <M> OmniVision ov5642 camera support                                                         │ │  
 │ │                      <M> OmniVision ov5640 camera support using mipi                                              │ │  
 │ │                      <M> Analog Device adv7180 TV Decoder Input support                                           │ │  
 │ │                      <*> Select Overlay Rounting (Queue ipu device for overlay library)  --->                     │ │  
 │ │                      <*> Pre-processor Encoder library                                                            │ │  
 │ │                      <*> IPU CSI Encoder library                                                                  │ │  
 │ │                                                                                                                   │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

Input Device

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > Input device support > Touchscreens

Enable:

  • ADS7846/TSC2046/AD7873 and AD(S)7843 based touchscreens
 ┌──────────────────────────────────────────────────── Touchscreens ─────────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      --- Touchscreens                                                                             │ │  
 │ │                      <M>   ADS7846/TSC2046/AD7873 and AD(S)7843 based touchscreens                                │ │  
 │ │...................................................................................................................│ │  
 │ │                                                                                                                   │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘  

OTG

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > USB support

Enable:

  • OTG support
 ┌───────────────────────────────────────────────────── USB support ─────────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      --- USB support                                                                              │ │  
 │ │                      <*>   Support for Host-side USB                                                              │ │  
 │ │...................................................................................................................│ │  
 │ │                      [*]     OTG support                                                                          │ │  
 │ │                      [ ]     Rely on OTG and EH Targeted Peripherals List                                         │ │  
 │ │...................................................................................................................│ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘  

USB Gadget Support

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > USB support > USB Gadget Support

Enable:

  • USB Gadget Drivers
  • Audio Gadget
  • UAC 1.0 (Legacy)
  • Ethernet Gadget (with CDC Ethernet support)
  • Mass Storage Gadget
  • Serial Gadget (with CDC ACM and CDC OBEX support)
 ┌───────────────────────────────────────────────── USB Gadget Support ──────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      --- USB Gadget Support                                                                       │ │  
 │ │...................................................................................................................│ │  
 │ │                      <M>   USB Gadget Drivers                                                                     │ │  
 │ │                      <M>     Audio Gadget                                                                         │ │  
 │ │                      [*]       UAC 1.0 (Legacy)                                                                   │ │  
 │ │                      <M>     Ethernet Gadget (with CDC Ethernet support)                                          │ │  
 │ │                      <M>     Mass Storage Gadget                                                                  │ │  
 │ │                      <M>     Serial Gadget (with CDC ACM and CDC OBEX support)                                    │ │    
 │ │...................................................................................................................│ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘  

Serial Console

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > Character devices > Serial drivers

Enable:

  • IMX serial port support
  • Console on IMX serial port
 ┌─────────────────────────────────────────────────── Serial drivers ────────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │...................................................................................................................│ │  
 │ │                      < > MAX310X support                                                                          │ │  
 │ │                      <*> IMX serial port support                                                                  │ │  
 │ │                      [*]   Console on IMX serial port                                                             │ │  
 │ │                      < > Digi International NEO and Classic PCI Support                                           │ │  
 │ │...................................................................................................................│ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ 

LED

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > LED Support > LED Trigger support

Enable:

  • LED Heartbeat Trigger
 ┌───────────────────────────────────────────────── LED Trigger support ─────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │                      --- LED Trigger support                                                                      │ │  
 │ │...................................................................................................................│ │  
 │ │                      <*>   LED Heartbeat Trigger                                                                  │ │  
 │ │...................................................................................................................│ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ 

RTC

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Device Drivers > Real Time Clock
  • EM Microelectronic EM3027
 ┌─────────────────────────────────────────────────── Real Time Clock ───────────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted letters are      │  
 │  hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help,    │  
 │  </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > module capable                                  │  
 │                                                                                                                       │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │...................................................................................................................│ │  
 │ │                      <*>   EM Microelectronic EM3027                                                              │ │  
 │ │...................................................................................................................│ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                               <Select>    < Exit >    < Help >    < Save >    < Load >                                │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

CMDLINE

make menuconfig 
.config - Linux/arm 4.1.15 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> Boot options
  • Edit CONFIG_CMDLINE
Admolition note.png The latest release procedure deploys the rootfs onto the 2-nd boot device partition.
This screen short reflects it.
 ┌──────────────────────────────────────────── Boot options ─────────────────────────────────────────────┐
 │  Arrow keys navigate the menu.  <Enter> selects submenus ---> (or empty submenus ----).  Highlighted  │  
 │  letters are hotkeys.  Pressing <Y> includes, <N> excludes, <M> modularizes features.  Press          │  
 │  <Esc><Esc> to exit, <?> for Help, </> for Search.  Legend: [*] built-in  [ ] excluded  <M> module    │  
 │  < > module capable                                                                                   │  
 │ ┌───────────────────────────────────────────────────────────────────────────────────────────────────┐ │  
 │ │              -*- Flattened Device Tree support                                                    │ │  
 │ │              [*]   Support for the traditional ATAGS boot data passing                            │ │  
 │ │              [ ]     Provide old way to pass kernel parameters                                    │ │  
 │ │              (0) Compressed ROM boot loader base address                                          │ │  
 │ │              (0) Compressed ROM boot loader BSS address                                           │ │  
 │ │              [ ] Use appended device tree blob to zImage (EXPERIMENTAL)                           │ │  
 │ │              (console=ttymxc3,115200 root=/dev/mmcblk2p2 rootwait) Default kernel command string  │ │  
 │ │                    Kernel command line type (Use bootloader kernel arguments if available)  --->  │ │  
 │ │              [ ] Kexec system call (EXPERIMENTAL)                                                 │ │  
 │ │              [ ] Build kdump crash kernel (EXPERIMENTAL)                                          │ │  
 │ │              -*- Auto calculation of the decompressed kernel image address                        │ │  
 │ │                                                                                                   │ │  
 │ │                                                                                                   │ │  
 │ │                                                                                                   │ │  
 │ └───────────────────────────────────────────────────────────────────────────────────────────────────┘ │  
 ├───────────────────────────────────────────────────────────────────────────────────────────────────────┤  
 │                       <Select>    < Exit >    < Help >    < Save >    < Load >                        │  
 └───────────────────────────────────────────────────────────────────────────────────────────────────────┘
                ┌───────────────────── Default kernel command string ─────────────────────┐
                │  Please enter a string value. Use the <TAB> key to move from the input  │  
                │  field to the buttons below it.                                         │  
                │ ┌─────────────────────────────────────────────────────────────────────┐ │  
                │ │console=ttymxc3,115200 root=/dev/mmcblk2p2 rootwait                  │ │  
                │ └─────────────────────────────────────────────────────────────────────┘ │  
                │                                                                         │  
                ├─────────────────────────────────────────────────────────────────────────┤  
                │                         <  Ok  >      < Help >                          │  
                └─────────────────────────────────────────────────────────────────────────┘

See also