Transclusion: CL-SOM-iMX7: U-Boot: Building Images

Snapshot download

• Download v2017.07 snapshot with your web browser.
• Extract the downloaded archive u-boot-d85ca02.tar.gz

cd /home/development/cl-som-imx7/u-boot
tar xvf /path/to/downloaded/u-boot-d85ca02.tar.gz
mv u-boot* u-boot-cl-som-imx7

This will create /home/development/cl-som-imx7/u-boot/u-boot-cl-som-imx7 directory containing U-Boot source code tree.

• Apply the CL-SOM-iMX7 patch

cd /home/development/cl-som-imx7/u-boot/u-boot-cl-som-imx7
patch -p1 < /path/to/cl-som-imx7-u-boot-package/u-boot/u-boot-*.patch

Git clone

• Install git version control system.
• Create a clone of U-Boot tree

cd /home/development/cl-som-imx7/u-boot
git clone git://git.denx.de/u-boot.git u-boot-cl-som-imx7
cd /home/development/cl-som-imx7/u-boot/u-boot-cl-som-imx7

• Create a branch for CL-SOM-iMX7 development. The CL-SOM-iMX7 patches are generated vs. v2017.07 tag (d85ca029f257b53a96da6c2fb421e78a003a9943 commit) in the U-Boot tree. It is recommended to use exactly the same baseline to avoid merge conflicts.

git checkout -b cl-som-imx7-dev v2017.07

• Apply CL-SOM-iMX7 patch

git am /path/to/cl-som-imx7-u-boot-package/u-boot/patches/*.patch

Building the firmware images

• First, compile U-Boot. The following commands create the u-boot.imx binary (along with other image types):

export ARCH=arm
export CROSS_COMPILE=arm-none-linux-eabi-
make mrproper
make cl-som-imx7_defconfig && make

• Merge the SPL and U-Boot images into one firmware image:

dd if=/dev/zero count=640 bs=1K | tr '\000' '\377' > cl-som-imx7-firmware
dd if=SPL of=cl-som-imx7-firmware bs=1K seek=1 conv=notrunc
dd if=u-boot.img of=cl-som-imx7-firmware bs=1K seek=64 conv=notrunc