iMX8MP-COMPACT-CM Linux
Setting Boot mode
| BOOT | J4:1-2 | J4:3-4 | J4:5-6 | J4:7-8 |
|---|---|---|---|---|
| Cortex-A53 Serial Downloader | close | open | open | open |
| Cortex-A53, eMMC | open | close | open | open |
Terminal Setup
The carrier board connects the host PC using the micro-B USB connector (J6).
Common serial communication programs such as Minicom, HyperTerminal, Tera Term, or PuTTY can be used.
The iMX8MP-CM board uses the second port for the Arm Cortex-A cores console.
Overview
The Linux kernel provides support for on-board peripherals and interfaces of the iMX8MP-CM System-on-Module
Building kernel for iMX8MP-CM
This Linux kernel is based on https://github.com/nxp-imx/linux-imx, branch lf-6.1.y
Set up the cross-compiler and CPU architecture
$ export ARCH=arm64 $ export CROSS_COMPILE=/opt/cross/aarch64-ronetix-linux-11.1/bin/aarch64-ronetix-linux-gnu-
Cross-compiler can be downloaded from here: http://download.ronetix.at/toolchains/crosstool-ng
Clone the latest revision of the repo
$ git clone https://github.com/ronetix/linux.git $ cd linux $ git checkout remotes/origin/lf-6.1.y -b lf-6.1.y
Configure and build
$ make imx8mp_cm_defconfig $ make # or make -j$(nproc)
Build Results
The resulted images are located in arch/arm64/boot
| File Name | Description |
|---|---|
| Image | Linux kernel image |
| zImage | Linux kernel image, compressed |
| imx8mp-cm.dtb | Device tree blob for iMX8MP-CM |
Booting Linux Kernel
This section describes how to load and boot Linux kernel using UUU.
The Linux Kernel booting requires a bootloader.
The bootloader includes SPL, U-Boot, Arm Trusted Firmware, OP-TEE, Sentinel
Firmware and DDR PHY Firmware.
It can be built:
- by Yocto, the result is: tmp/deploy/images/imx8mp-cm/imx-boot-tagged
or
- by the script u-boot-imx/tools/imx_build_firmware.sh, the result is: uboot-imx/imx-mkimage/iMX8M/flash.bin
See Building U-Boot for more info how to build flash.bin
Universal update utility
The Universal Update Utility (UUU) runs on a Windows or Linux OS host and is used to download images to devices on an i.MX board.
Downloading UUU
Download UUU version 1.5.21 or later from https://github.com/nxp-imx/mfgtools/releases
Connect USB ports
Follow the instructions below:
- Connect a USB cable from a computer to the J7, port USB-3 (Type C) port on the carrier board for download link.
- Connect a USB cable from J6, port UART-DBG (Micro-AB) port to the computer for console output.
- Open a Terminal emulator program
- Set the boot mode to "Cortex-A53 Serial Downloader", see #Setting Boot mode
Upload and boot
U-BOOT must be already built in folder: uboot-imx
$ cd arch/arm64/boot $ cp ../../../../uboot-imx/imx-mkimage/iMX8M/flash.bin . $ wget http://download.ronetix.at/boards/doc/i.MX8MP-COMPACT-CM/tools/kernel.uuu $ uuu kernel.uuu
- Set the boot mode to "Cortex-A53, eMMC", see #Setting Boot mode
- reset the board
Boot log
http://download.ronetix.at/boards/doc/i.MX8MP-COMPACT-CM/imx8mp-cm_bootlog.txt
See also