Yocto Build U-Boot

From Variscite Wiki
Yocto Build U-Boot from source code

1 Toolchain installation for out of Yocto builds

To install the toolchain, follow Yocto Toolchain installation.

2 Build U-Boot out of Yocto tree

Obtain sources:

$ git clone https://github.com/varigit/uboot-imx.git -b imx_v2020.04_5.4.24_2.1.0_var02
$ cd uboot-imx

Configure compilation environment:

$ source /opt/fslc-xwayland/3.1/environment-setup-aarch64-fslc-linux

Cleanup everything:

$ make mrproper

Select configuration:

$ make imx8qm_var_som_defconfig

Build U-Boot:

$ make -j$(nproc)

3 Build boot image

The final boot image contains multiple firmware files. The following procedure builds the final image.

Create imx-boot-tools directory:

$ mkdir imx-boot-tools
$ cd imx-boot-tools

Obtain SC firmware:
Build SCFW by following the Build SCFW from source code page and copy the SCFW image to the imx-boot-tools directory.

  Download SECO firmware:

$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-seco-3.6.3.bin
$ chmod +x imx-seco-3.6.3.bin
$ ./imx-seco-3.6.3.bin
$ cp imx-seco-3.6.3/firmware/seco/mx8q*-ahab-container.img .

Download and build imx_mkimage:

$ git clone https://source.codeaurora.org/external/imx/imx-mkimage -b imx_5.4.24_2.1.0
$ cd imx-mkimage
$ make 
$ cp mkimage_imx8 iMX8QM/soc.mak iMX8QM/*.sh scripts/pad_image.sh ..
$ cd ..

Download and build ATF:

$ git clone https://source.codeaurora.org/external/imx/imx-atf -b imx_5.4.24_2.1.0 

$ cd imx-atf  
$ source /opt/fslc-xwayland/3.1/environment-setup-aarch64-fslc-linux
$ unset LDFLAGS
$ make PLAT=imx8qm bl31
$ cp build/imx8qm/release/bl31.bin ..
$ cd ..

Copy U-Boot binaries:

$ cp ../tools/mkimage mkimage_uboot
$ cp ../u-boot.bin .
$ cp ../spl/u-boot-spl.bin .

Build boot image:

$ make -f soc.mak clean
$ make -f soc.mak SOC=iMX8QM MKIMG=./mkimage_imx8 PAD_IMAGE=./pad_image.sh flash_spl
$ mv flash.bin imx-boot-sd.bin

4 Install the built U-Boot on an SD card

$ sudo dd if=imx-boot-sd.bin of=/dev/sdX bs=1K seek=32 conv=fsync

(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 imx-boot-sd.bin /media/rootfs/opt/images/…

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 (see Environment handling commands)

5 Update your U-Boot out of Yocto tree

$ git pull