Yocto Build U-Boot
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 -b lf_v2023.04_var02 $ cd uboot-imx
Configure compilation environment:
$ source /opt/var-debian-xwayland/1.0/environment-setup-armv8a-fsl-linux
Cleanup everything:
$ make mrproper
Select configuration:
$ make imx93_var_som_defconfig
Build U-Boot:
$ make -j$(nproc)
Build boot image
The final boot image contains multiple firmware files, as explained by NXP in IMX_LINUX_USERS_GUIDE.pdf (Search for "How to build imx-boot image by using imx-mkimage").
The following procedure builds the final image:
Create imx-boot-tools directory:
$ mkdir imx-boot-tools $ cd imx-boot-tools
Download Sentinel firmware:
$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-sentinel-0.11.bin $ chmod +x firmware-sentinel-0.11.bin $ ./firmware-sentinel-0.11.bin $ cp firmware-sentinel-0.11/mx93a1-ahab-container.img .
Download DDR firmware:
$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.21.bin $ chmod +x firmware-imx-8.21.bin $ ./firmware-imx-8.21.bin $ cp firmware-imx-8.21/firmware/ddr/synopsys/* .
Download and build imx_mkimage:
$ git clone https://github.com/nxp-imx/imx-mkimage -b lf-6.1.36_2.1.0 $ cd imx-mkimage $ make soc=iMX9 $ cp iMX9/soc.mak mkimage_imx8 .. $ cd ..
Download and build ATF:
$ git clone https://github.com/varigit/imx-atf -b lf_v2.8_var02 $ cd imx-atf $ source /opt/var-debian-xwayland/1.0/environment-setup-armv8a-fsl-linux $ unset LDFLAGS $ make PLAT=imx93 bl31 $ cp build/imx93/release/bl31.bin .. $ cd ..
Copy U-Boot binaries:
$ cp ../tools/mkimage mkimage_uboot $ cp ../u-boot.bin . $ cp ../spl/u-boot-spl.bin ../arch/arm/dts/imx93-var-som-symphony.dtb .
Build boot image:
$ make -f soc.mak clean $ make -f soc.mak SOC=iMX9 dtbs="imx93-var-som-symphony.dtb" MKIMG=./imx-mkimage/mkimage_imx8 PAD_IMAGE=./pad_image.sh CC=gcc flash_singleboot $ mv flash.bin imx-boot-sd.bin
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 /media/rootfs/opt/images/…
And eject the SD card gracefully from host machine.
Update your U-Boot out of Yocto tree
$ git pull