4.13.3.21. NXP i.MX8MP-EVK board

The board comes with:

• 6GiB of LPDDR4 RAM

• 32GiB eMMC

Not including booting via serial, the device can boot from either SD or eMMC.

4.13.3.21.1. Downloading DDR PHY firmware

As a part of DDR intialization routine NXP i.MX8MQ EVK requires and uses several binary firmware blobs that are distributed under a separate EULA and cannot be included in Barebox. In order to obtain them do the following:

wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.7.bin
chmod +x firmware-imx-8.7.bin
./firmware-imx-8.7.bin

Executing that file should produce a EULA acceptance dialog as well as result in the following files:

• lpddr4_pmu_train_1d_dmem.bin

• lpddr4_pmu_train_1d_imem.bin

• lpddr4_pmu_train_2d_dmem.bin

• lpddr4_pmu_train_2d_imem.bin

As a last step of this process those files need to be placed in “firmware/”:

for f in lpddr4_pmu_train_1d_dmem.bin  \
         lpddr4_pmu_train_1d_imem.bin  \
         lpddr4_pmu_train_2d_dmem.bin  \
         lpddr4_pmu_train_2d_imem.bin; \
do \
         cp firmware-imx-8.7/firmware/ddr/synopsys/${f} \
            firmware/${f}; \
done

4.13.3.21.2. Get and Build the ARM Trusted firmware

Get ATF from https://source.codeaurora.org/external/imx/imx-atf, branch imx_5.4.3_2.0.0:

make PLAT=imx8mp bl31
cp build/imx8mp/release/bl31.bin ${barebox_srctree}/imx8mp-bl31.bin

4.13.3.21.3. Build Barebox

i.MX8MP-EVK support is contained in the imx_v8_defconfig to build it use:

make imx_v8_defconfig
make

4.13.3.21.4. Boot Configuration

The NXP i.MX8MP-EVK board has four switches responsible for configuring bootsource/boot mode. The settings for the different boot sources are printed on the board.