Kontron Electronics i.MX8MM SoMs and Boards
The SL i.MX8MM and OSM-S i.MX8MM by Kontron Electronics GmbH are SoM modules with an i.MX8M-Mini SoC, 1/2/4 GB LPDDR4 RAM, SPI NOR, eMMC and PMIC.
The matching evaluation boards (Board-Line, BL) have two Ethernet ports, USB 2.0, HDMI/LVDS, SD card, CAN, RS485, RS232 and much more.
The OSM-S i.MX8MM is compliant to the Open Standard Module (OSM) 1.1 specification, size S (https://sget.org/standards/osm).
Quick Start
Get and Build the Trusted Firmware-A (TF-A)
Get the DDR firmware
Build U-Boot
Boot
Note
To build on a x86-64 host machine, you need a GNU cross toolchain for the
target architecture (aarch64). Check your distros package manager or
download and install the necessary tools (aarch64-linux-gnu-*
) manually.
Get and Build the Trusted Firmware-A (TF-A)
There are two sources for the TF-A. Mainline and NXP. Get the one you prefer (support and features might differ).
Note
If you are using GCC 12 and you get compiler/linker errors, try to add the
following arguments to your make command as workaround:
CFLAGS="-Wno-array-bounds" LDFLAGS="--no-warn-rwx-segments"
NXP’s imx-atf
Get TF-A from: https://github.com/nxp-imx/imx-atf, branch: lf_v2.6
Build
$ make PLAT=imx8mm CROSS_COMPILE=aarch64-linux-gnu- IMX_BOOT_UART_BASE="0x30880000" bl31 $ cp build/imx8mm/release/bl31.bin $(builddir)
Note
builddir is U-Boot’s build directory (source directory for in-tree builds)
Mainline TF-A
Get TF-A from: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/, tag: v2.4
Build
$ make PLAT=imx8mm CROSS_COMPILE=aarch64-linux-gnu- IMX_BOOT_UART_BASE="0x30880000" bl31 $ cp build/imx8mm/release/bl31.bin $(builddir)
Get the DDR firmware
$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.18.bin
$ chmod +x firmware-imx-8.18.bin
$ ./firmware-imx-8.18.bin
$ cp firmware-imx-8.18/firmware/ddr/synopsys/lpddr4_pmu_train_1d_imem.bin $(builddir)
$ cp firmware-imx-8.18/firmware/ddr/synopsys/lpddr4_pmu_train_1d_dmem.bin $(builddir)
$ cp firmware-imx-8.18/firmware/ddr/synopsys/lpddr4_pmu_train_2d_imem.bin $(builddir)
$ cp firmware-imx-8.18/firmware/ddr/synopsys/lpddr4_pmu_train_2d_dmem.bin $(builddir)
Build U-Boot
$ make kontron-sl-mx8mm_defconfig
$ make CROSS_COMPILE=aarch64-linux-gnu-
Copy the flash.bin to SD card at an offset of 33 KiB:
$ dd if=flash.bin of=/dev/sd[x] bs=1K seek=33 conv=notrunc
Boot
Put the SD card in the slot on the board and apply power. Check the serial console for output.
Flash the Bootloader to SPI NOR
Determine and note the exact size of the
flash.bin
image in bytes (e.g. by runningls -l flash.bin
)On the U-Boot CLI copy the bootloader from SD card to RAM:
mmc dev 1 mmc read $loadaddr 0x42 0x1000
Erase the SPI NOR flash:
sf probe sf erase 0x0 0x200000
Copy the bootloader from RAM to SPI NOR. For the last parameter of the command, use the size determined in step 1 in hexadecimal notation:
sf write $loadaddr 0x400 0x13B6F0
Note
To be able to boot from SPI NOR the OTP fuses need to be set accordingly.
Further Information
The bootloader configuration is setup to be used with kernel FIT images. Legacy images might not be working out of the box.
Please see https://docs.kontron-electronics.de for further vendor documentation.