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_v2023.04_var02 $ cd uboot-imx
Configure compilation environment:
$ source /opt/fsl-imx-xwayland/6.1-mickledore/environment-setup-armv8a-poky-linux
Cleanup everything:
$ make mrproper
Select configuration:
$ make imx8qxp_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
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-5.9.0.bin $ chmod +x imx-seco-5.9.0.bin $ ./imx-seco-5.9.0.bin $ cp imx-seco-5.9.0/firmware/seco/mx8q*-ahab-container.img .
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 $ cp mkimage_imx8 iMX8QX/soc.mak iMX8QX/*.sh scripts/pad_image.sh .. $ cd ..
Download and build ATF:
$ git clone https://github.com/varigit/imx-atf -b lf_v2.8_var02 $ cd imx-atf $ source /opt/fsl-imx-xwayland/6.1-mickledore/environment-setup-armv8a-poky-linux $ unset LDFLAGS $ make PLAT=imx8qx bl31 $ cp build/imx8qx/release/bl31.bin .. $ cd ..
Copy U-Boot binaries:
$ cp ../tools/mkimage mkimage_uboot $ cp ../u-boot.bin . $ cp ../spl/u-boot-spl.bin .
Depending on i.MX8QXP SOC revision different instructions should be used to build boot image.
The SOC revision is printed by u-boot as follows
CPU: Freescale i.MX8QXP revB A35 at 1200 MHz at 36C
or
CPU: Freescale i.MX8QXP revC A35 at 1200 MHz at 36C
Build boot image for SOC revision B:
$ make -f soc.mak clean $ make -f soc.mak SOC=iMX8QX REV=B0 MKIMG=./mkimage_imx8 PAD_IMAGE=./pad_image.sh flash_spl $ mv flash.bin imx-boot-sd.bin
Build boot image for SOC revision C:
$ make -f soc.mak clean $ make -f soc.mak SOC=iMX8QX REV=C0 MKIMG=./mkimage_imx8 PAD_IMAGE=./pad_image.sh flash_spl $ 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