Mike: CM-T3530: U-Boot: Firmware Overview moved to CM-T3x: U-Boot: Firmware Overview

2010-12-15T13:55:37Z

CM-T3530: U-Boot: Firmware Overview moved to CM-T3x: U-Boot: Firmware Overview

Mike at 15:17, 22 December 2009

2009-12-22T15:17:22Z

New page

CM-T3530 firmware consists of two components: X-Loader and U-Boot. X-Loader is the bootstrap utility invoked by the boot ROM code of OMAP35x processor. X-Loader performs minimal hardware initialization and loads stage two bootloader, namely U-Boot. U-Boot initializes hardware modules necessary for system boot and loads the operating system.

== X-Loader ==
X-Loader should reside in the first erase block of the system NAND flash or in a file on MMC/SD card. It is loaded into OMAP35x internal SRAM immediately after system reset. The OMAP35x internal boot ROM determines what storage media to use in accordance with BOOT_SOURCE signal value (pin 65 of connector P1 on CM-T3530). SB-T35 allows easy switch between NAND and MMC/SD boot.

X-Loader is responsible for initial clock setup, DDR initialization and boot media controller initialization. After basic hardware setup X-Loader loads U-Boot bootloader into the system RAM and transfers control to the U-Boot bootloader.

== U-Boot ==
U-Boot is the stage two bootloader used on CM-T3530. It allows flexible selection of operating system boot modes, provides scripting facilities and command line interface through serial port.

U-Boot should reside in the system NAND flash starting from offset 0x80000. In addition, two blocks at offset 0x260000 are used by the U-Boot environment. In case an MMC/SD card is used as boot media, U-Boot binary should be present in card's root directory and named {{filename|u-boot.bin}}.

U-Boot allows booting operating system from the on-board NAND flash, MMC/SD card or from network.
Please consult [[U-Boot quick reference]] and [http://www.denx.de/wiki/U-Boot/Documentation U-Boot project documentation] for U-Boot features and commands description.

== Boot sources ==
CM-T3530 can boot either from on-board NAND flash or from MMC/SD card. The boot source can be selected using jumper E6 or button SW1 on SB-T35.
* To boot the system from the on-board NAND flash make sure that jumper E6 is not present.
* To boot the system from the MMC/SD card install jumper E6 before power-on or hold button SW1 during system startup.
Please refer to [[CM-T3530: Linux: Booting from MMC/SD card]] for further details.

== Default NAND flash mapping ==
{| cellpadding="3" border="1" style="border: 1px solid rgb(85, 85, 85); border-collapse: collapse;"
|+ CM-T3530 NAND flash mapping
|-
! Offset
! Description
! Size (kilobytes)
|-
| 0x0
| X-Loader
| 512
|-
| 0x80000
| U-Boot
| 640
|-
| 0x12000
| Reserved
| 1280
|-
| 0x260000
| U-Boot environment
| 256
|-
| 0x2a0000
| Linux kernel
| 4096
|-
| 0x6a0000
| Linux filesystem
| remaining NAND flash space
|}

== Know issues ==
* If U-Boot environment variable {{parameter|bootdelay}} is set to 0 or an invalid value, automatic OS boot cannot be stopped.

[[Category:U-Boot|Firmware Overview]]
[[Category:CM-T3530|U-Boot: Firmware Overview]]

← Older revision		Revision as of 13:55, 15 December 2010
Line 1:		Line 1:
−	CM-T3530 firmware consists of two components: X-Loader and U-Boot. X-Loader is the bootstrap utility invoked by the boot ROM code of OMAP35x processor. X-Loader performs minimal hardware initialization and loads stage two bootloader, namely U-Boot. U-Boot initializes hardware modules necessary for system boot and loads the operating system.	+	#REDIRECT [[CM-T3x: U-Boot: Firmware Overview]]
−
−	~~== X-Loader ==~~
−	X-Loader should reside in the first erase block of the system NAND flash or in a file on MMC/SD card. It is loaded into OMAP35x internal SRAM immediately after system reset. The OMAP35x internal boot ROM determines what storage media to use in accordance with BOOT_SOURCE signal value (pin 65 of connector P1 on CM-T3530). SB-T35 allows easy switch between NAND and MMC/SD boot.
−
−	X-Loader is responsible for initial clock setup, DDR initialization and boot media controller initialization. After basic hardware setup X-Loader loads U-Boot bootloader into the system RAM and transfers control to the U-Boot bootloader.
−
−	~~== U-Boot ==~~
−	~~U-Boot is the stage two bootloader used on CM-T3530. It allows flexible selection of operating system boot modes, provides scripting facilities and command line interface through serial port.~~
−
−	U-Boot should reside in the system NAND flash starting from offset 0x80000. In addition, two blocks at offset 0x260000 are used by the U-Boot environment. In case an MMC/SD card is used as boot media, U-Boot binary should be present in card's root directory and named {{filename\|u-boot.bin}}.
−
−	~~U-Boot allows booting operating system from the on-board NAND flash, MMC/SD card or from network.~~
−	~~Please consult [[U-Boot quick reference]] and [http://www.denx.de/wiki/U-Boot/Documentation U-Boot project documentation] for U-Boot features and commands description.~~
−
−	~~== Boot sources ==~~
−	~~CM-T3530 can boot either from on-board NAND flash or from MMC/SD card. The boot source can be selected using jumper E6 or button SW1 on SB-T35.~~
−	* To boot the system from the on-board NAND flash make sure that jumper E6 is not present.
−	* To boot the system from the MMC/SD card install jumper E6 before power-on or hold button SW1 during system startup.
−	~~Please refer to~~ [[CM-~~T3530: Linux: Booting from MMC/SD card]] for further details.~~
−
−	~~== Default NAND flash mapping ==~~
−	~~{\| cellpadding="3" border="1" style="border: 1px solid rgb(85, 85, 85); border-collapse: collapse;"~~
−	~~\|+ CM-T3530 NAND flash mapping~~
−	\|-
−	~~! Offset~~
−	~~! Description~~
−	~~! Size (kilobytes)~~
−	\|-
−	~~\| 0x0~~
−	~~\| X-Loader~~
−	~~\| 512~~
−	\|-
−	~~\| 0x80000~~
−	~~\| U-Boot~~
−	~~\| 640~~
−	\|-
−	~~\| 0x12000~~
−	~~\| Reserved~~
−	~~\| 1280~~
−	\|-
−	~~\| 0x260000~~
−	~~\| U-Boot environment~~
−	~~\| 256~~
−	\|-
−	~~\| 0x2a0000~~
−	~~\| Linux kernel~~
−	~~\| 4096~~
−	\|-
−	~~\| 0x6a0000~~
−	~~\| Linux filesystem~~
−	~~\| remaining NAND flash space~~
−	\|}
−
−	~~== Know issues ==~~
−	* If U-Boot environment variable {{parameter\|bootdelay}} is set to 0 or an invalid value, automatic OS boot cannot be stopped.
−
−	~~[[Category:U-Boot\|Firmware Overview]]~~
−	~~[[Category~~:~~CM-T3530\|~~U-Boot: Firmware Overview]]

CM-T3530: U-Boot: Firmware Overview - Revision history

Mike: CM-T3530: U-Boot: Firmware Overview moved to CM-T3x: U-Boot: Firmware Overview

Mike at 15:17, 22 December 2009