Yocto Build U-Boot MX95

Warning: This page is designed to be used with a 'release' URL parameter.

This page is using the default release mx95-yocto-scarthgap-6.6.23_2.0.0-v1.0.
To view this page for a specific Variscite SoM and software release, please follow these steps:

1. Visit variwiki.com
2. Select your SoM
3. Select the software release

Yocto Build U-Boot from source code

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)

Download and install Arm-none-eabi cross-compiler required to build OEI and SM

$ wget https://developer.arm.com/-/media/Files/downloads/gnu/13.2.Rel1/binrel/arm-gnu-toolchain-13.2.Rel1-x86_64-arm-none-eabi.tar.xz
$ sudo tar -xf arm-gnu-toolchain-13.2.Rel1-x86_64-arm-none-eabi.tar.xz -C /opt

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 imx_mkimage:

$ git clone https://github.com/nxp-imx/imx-mkimage -b lf-6.6.23-2.0.0

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
$ rm firmware-imx-8.24-fbe0a4c.bin
$ cp firmware-imx-8.24-fbe0a4c/firmware/ddr/synopsys/* imx-mkimage/iMX95

Download ELE firmware:

$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-ele-imx-0.1.2-4ed450a.bin
$ chmod +x firmware-ele-imx-0.1.2-4ed450a.bin
$ ./firmware-ele-imx-0.1.2-4ed450a.bin
$ rm firmware-ele-imx-0.1.2-4ed450a.bin
$ cp firmware-ele-imx-0.1.2-4ed450a/mx95a0-ahab-container.img imx-mkimage/iMX95

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 ../imx-mkimage/iMX95
$ cd ..

Download and build OEI DDR Image and OEI TCM Image:

$ git clone https://github.com/varigit/imx-oei -b lf-6.6.23-2.0.0_var01 
$ cd imx-oei
$ export OEI_CROSS_COMPILE=/opt/arm-gnu-toolchain-13.2.Rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-
$ make really-clean
$ make board=mx95lp5 DEBUG=0 oei=ddr
$ cp build/mx95lp5/ddr/oei-m33-ddr.bin ../imx-mkimage/iMX95
$ make board=mx95lp5 DEBUG=0 oei=tcm
$ cp build/mx95lp5/tcm/oei-m33-tcm.bin ../imx-mkimage/iMX95
$ cd ..

Download and build SM:

$ git clone https://github.com/varigit/imx-sm -b lf-6.6.23-2.0.0_var01 
$ cd imx-sm
$ export SM_CROSS_COMPILE=/opt/arm-gnu-toolchain-13.2.Rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-
$ make really-clean
$ make -j $(nproc --all) config=mx95evk cfg
$ make -j $(nproc --all) config=mx95evk img
$ cp build/mx95evk/m33_image.bin ../imx-mkimage/iMX95
$ cd ..

Copy U-Boot binaries:

$ cp ../u-boot.bin imx-mkimage/iMX95
$ cp ../spl/u-boot-spl.bin imx-mkimage/iMX95

Build boot image:

$ cd imx-mkimage
$ make clean
$ make SOC=iMX95 flash_a55 REV=A0 OEI=YES LPDDR_TYPE=lpddr5 LPDDR_FUNC=train
$ mv iMX95/flash.bin iMX95/imx-boot-sd.bin

Install the built U-Boot on an SD card

$ sudo dd if=iMX95/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 iMX95/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)

Update your U-Boot out of Yocto tree

$ git pull