DART-6UL Yocto Krogoth R2 Build U-Boot out of tree

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DART-6UL - Yocto Krogoth - Build U-Boot from source code

1 Toolchain installation for out of Yocto builds

To install the toolchain, follow DART-6UL Toolchain installation for out of Yocto Krogoth builds.

2 Build U-Boot out of Yocto tree

Obtain sources:

$ git clone https://github.com/varigit/uboot-imx.git
$ cd uboot-imx
$ git checkout imx_v2015.04_4.1.15_1.1.0_ga_var03

Build U-Boot:

$ source /opt/fsl-imx-x11/4.1.15-2.0.1/environment-setup-cortexa7hf-neon-poky-linux-gnueabi
$ make mrproper
Choose one of the following configurations:

For booting from SD card/eMMC:
$ make mx6ul_var_dart_mmc_defconfig

For booting from NAND flash:
$ make mx6ul_var_dart_nand_defconfig
$ make -j4

3 Install the built U-Boot on an SD card

$ sudo dd if=SPL of=/dev/sdX bs=1K seek=1; sync
$ sudo dd if=u-boot.img of=/dev/sdX bs=1K seek=69; sync
(Replace /dev/sdX with the correct device)

If you want to use our recovery SD card to flash the built U-Boot to NAND flash/eMMC, then copy it to the appropriate location in the SD card:

$ sudo cp SPL /media/rootfs/opt/images/...
$ sudo cp u-boot.img /media/rootfs/opt/images/...

And eject the SD card gracefully from host machine.

4 Update your U-Boot out of Yocto tree

$ git pull