Yocto Build U-Boot

Yocto Build U-Boot from source code

Toolchain installation for out of Yocto builds

To install the toolchain, follow Yocto Toolchain installation.

Build U-Boot out of Yocto tree

Obtain sources:

$ git clone 
$ cd uboot-imx
$ git checkout -b  origin/

Build U-Boot:

$ source 

$ make mrproper

Choose one of the following configurations:
$ make 		# For booting from SD card/eMMC
$ make 		# For booting from NAND flash

$ make -j4

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.

Update your U-Boot out of Yocto tree

$ git pull