4.13.3.19. NXP i.MX8MN EVK Evaluation Board¶

Board comes with either:

2GiB of LPDDR4 RAM
2GiB of DDR4 RAM

barebox supports both variants with the same image.

4.13.3.19.1. Downloading DDR PHY Firmware¶

As a part of DDR intialization routine NXP i.MX8MN 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-8.12.bin
chmod +x firmware-imx-8.12.bin
./firmware-imx-8.12.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
ddr4_dmem_1d_201810.bin
ddr4_imem_1d_201810.bin
ddr4_dmem_2d_201810.bin
ddr4_imem_2d_201810.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-8.0/firmware/ddr/synopsys/${f} \
            firmware/${f}; \
done

for f in ddr4_dmem_1d_201810.bin  \
         ddr4_imem_1d_201810.bin  \
         ddr4_dmem_2d_201810.bin  \
         ddr4_imem_2d_201810.bin; \
do \
         cp firmware-imx-8.0/firmware/ddr/synopsys/${f} \
            firmware/${f%_201810.bin}.bin; \
done

4.13.3.20. Build barebox¶

make imx_v8_defconfig make