Yocto Build U-Boot from source code¶
Toolchain Installation for Out of Yocto Builds¶
To install the toolchain, follow the Yocto Toolchain installation guide.
Build U-Boot Out of Yocto Tree¶
Obtain sources:
git clone https://github.com/varigit/uboot-imx.git -b imx_v2018.03_4.14.78_1.0.0_ga_var02
cd uboot-imx
Configure compilation environment:
Cleanup everything:
Select 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
Build U-Boot:
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:
And eject the SD card gracefully from host machine.
Note: If you manually upgrade an existing U-Boot, and you have an old environment saved, it is a good idea to reset your environment to the new default.)