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.git -b lf_v2024.04_6.6.23-2.0.0_var01 $ cd uboot-imx
Configure compilation environment:
$ source /opt/fsl-imx-xwayland/6.6-scarthgap/environment-setup-armv8a-poky-linux
Cleanup everything:
$ make mrproper
Select configuration:
$ make imx95_var_dart_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 $ chmod +x $ ./ $ cp .
Download DDR firmware:
$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.24-fbe0a4c.bin $ chmod +x firmware-imx-8.24-fbe0a4c.bin $ ./firmware-imx-8.24-fbe0a4c.bin $ cp firmware-imx-8.24-fbe0a4c/firmware/ddr/synopsys/* .
Download and build imx_mkimage:
$ git clone https://github.com/nxp-imx/imx-mkimage -b lf-6.6.23-2.0.0 $ cd imx-mkimage $ make soc=iMX95 $ cp iMX95/soc.mak mkimage_imx8 .. $ cd ..
Download and build ATF:
$ git clone https://github.com/varigit/imx-atf -b lf_v2.10_6.6.23-2.0.0_var01 $ cd imx-atf $ source /opt/fsl-imx-xwayland/6.6-scarthgap/environment-setup-armv8a-poky-linux $ unset LDFLAGS $ make PLAT=imx95 bl31 $ cp build/imx95/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/imx95-var-dart-dt8mcustomboard.dtb .
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.
Update your U-Boot out of Yocto tree
$ git pull