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:

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

Build U-Boot:

$ source

$ cd 
$ make mrproper
Choose build for SD card or NAND flash:
$ make 
or
$ make 
$ make -j4

Flash U-Boot to the 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)

In case of UBI copy it to the SD card (assuming you are using our recovery SD card):

$ sudo cp SPL /media/rootfs/opt/images/Yocto/SPL-nand
$ sudo cp u-boot.img /media/rootfs/opt/images/Yocto/
or (depend on your build):
$ sudo cp SPL /media/rootfs/opt/images/Yocto/SPL-sd
$ sudo cp u-boot.img /media/rootfs/opt/images/Yocto/

And eject the SD card gracefully from host machine.

Update your U-Boot out of Yocto tree

$ git fetch origin
$ git pull