UCM-iMX91: Yocto Linux: Manual Installation: SD card

Introduction

This article provides instructions needed to install the Yocto Linux SD-card image on SD card using a Linux Host workstation. The image provides full boot system including U-Boot, Linux kernel, device driver modules and example root filesystem.

Preparation steps

• Obtain a Linux PC workstation.
• Obtain a USB Card reader and an micro-SD Card. Any commercially available micro-SD card of 4GB (or larger) may be used for the installation.
• Download the UCM-iMX91 Yocto Linux package from CompuLab website.
• Unzip the package to a directory on the host workstation. From now we assume the device name is pakage_dir.
• The Yocto Linux SD-card image file, mentioned below, can be found in the images subdirectory.
• Plug the USB SD Card reader into the host PC. Insert the micro-SD Card into the USB Card reader. From now we assume the device name of the MMC/SD card on your Linux PC is /dev/sdX.

Installation

• Flash the image file to the micro-SD card:

zstd -dc imx-image-full-ucm-imx91.wic.zst | sudo dd of=/dev/sdX bs=1M status=progress

Run Yocto Linux image

• Insert the micro-SD card into SD socket P15 (see drawing)
• Connect a standard USB cable (included in the kit) between your host PC and the evaluation kit micro-USB2.0 connector P16 (see drawing)

  Use a terminal emulator as described here

• Power On the system
• The system boots into Linux

Start U-Boot + Linux from SD card (ALT_Boot)

• Insert the micro-SD card into SD socket P15 (see drawing)
• Install jumper E2 or Press and hold the ALT_BOOT button (SW3) and then power-on or power cycle the system to force bootloader start from SD card (see drawing). Release ALT_BOOT button after 2-3 seconds
• The system boots into Linux from SD card