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 imx_v2019.04_4.19.35_1.1.0-var01 $ cd uboot-imx
Configure compilation environment:
$ source /opt/fsl-imx-xwayland/4.19-warrior/environment-setup-aarch64-poky-linux
Cleanup everything:
$ make mrproper
Select configuration:
$ make imx8mm_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 DDR firmware:
$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.5.bin $ chmod +x firmware-imx-8.5.bin $ ./firmware-imx-8.5.bin $ cp firmware-imx-8.5/firmware/ddr/synopsys/* .
Download imx_mkimage:
$ git clone https://github.com/nxp-imx/imx-mkimage -b imx_4.19.35_1.1.0 $ cp imx-mkimage/iMX8M/*.c imx-mkimage/iMX8M/*.sh imx-mkimage/scripts/*.sh .
Download and build ATF:
$ git clone https://github.com/nxp-imx/imx-atf -b imx_4.19.35_1.1.0 $ git clone https://github.com/varigit/meta-variscite-imx -b warrior-imx-4.19.35-var01 $ cp meta-variscite-imx/recipes-bsp/imx-mkimage/files/soc.mak . $ cd imx-atf $ git apply ../meta-variscite-imx/recipes-bsp/imx-atf/imx-atf/imx8mm* ../meta-variscite-imx/recipes-bsp/imx-atf/imx-atf/imx8m-* $ source /opt/fsl-imx-xwayland/4.19-warrior/environment-setup-aarch64-poky-linux $ unset LDFLAGS $ make PLAT=imx8mm bl31 $ cp build/imx8mm/release/bl31.bin .. $ cd ..
Copy U-Boot binaries:
$ cp ../tools/mkimage mkimage_uboot $ cp ../u-boot.bin . $ cp ../u-boot-nodtb.bin ../spl/u-boot-spl.bin ../arch/arm/dts/fsl-imx8mm-var-dart.dtb ../arch/arm/dts/fsl-imx8mm-var-som.dtb ../arch/arm/dts/fsl-imx8mm-var-som-rev10.dtb .
Build boot image:
$ make -f soc.mak clean $ make -f soc.mak SOC=iMX8MM dtbs="fsl-imx8mm-var-dart.dtb fsl-imx8mm-var-som.dtb fsl-imx8mm-var-som-rev10.dtb" MKIMG=./mkimage_imx8 PAD_IMAGE=./pad_image.sh CC=gcc OUTIMG=imx-boot-sd.bin flash_lpddr4_ddr4_evk
Install the built U-Boot on an SD card
$ sudo dd if=imx-boot-sd.bin of=/dev/sdX bs=1K seek=33 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