MCM-iMX8M-Plus: U-Boot: Recovery

Introduction

This article describes flashing U-Boot firmware image with a Linux Host using Universal Update Utility (hereinafter UUU).

Follow the Universal Update Utility instructions to install and setup UUU tool on a workstation.

Getting Recovery U-Boot Firmware Image

• Download the MCM-iMX8M-Plus Yocto Linux package from CompuLab website.

It's referred to as mcm-imx8m-plus_yocto-linux_YYYY-MM-DD.zip further in the article

• Extract the archive:

unzip mcm-imx8m-plus_yocto-linux_YYYY-MM-DD.zip -d /path/to/mcm-imx8m-plus_yocto-linux

Determining RAM size

Determine the correct DRAM size according to the label located on the bottom side of the device. DRAM size is encoded in the unit's D option.
Use the table below to determine DRAM_CONF value:

Product D Option	DRAM_CONF
D1	d1d8
D2	d2d4
D4	d2d4
D8	d1d8

Flashing U-Boot Firmware

• Turn off the MCM-iMX8M-Plus evaluation board
• Populate E19 jumper
• Connect the MCM-iMX8M-Plus evaluation board USB type-C connector J5 with the workstation USB port using a standard USB type-C cable.
• Power on the MCM-iMX8M-Plus evaluation board
• Issue following command:

uuu -lsusb

Expected output:

uuu (Universal Update Utility) for nxp imx chips -- libuuu_1.5.21-3-gcbff795

Connected Known USB Devices
        Path     Chip    Pro     Vid     Pid     BcdVersion
        ==================================================
        1:131    MX865   SDPS:   0x1FC9 0x0146   0x0002

• Flash U-Boot Firmware. Replace <DRAM_CONF> with the actual value:

sudo uuu -v -b emmc /path/to/mcm-imx8m-plus_yocto-linux/bootloader/imx-boot_mcm-imx8m-plus_<DRAM_CONF>

• Make sure the deployment is completed with no error

After Installation

• Turn off the device
• Disconnect the USB type-C cable from type-C connector
• Remove E19 jumper
• Turn on the device
• Restore default boot environment