IOT-GATE-iMX8 and SBC-IOT-iMX8: U-Boot: Recovery

Introduction

The following scenarios may render the device inoperable:

• U-Boot update failure
• U-Boot update using an incorrect or corrupted image

In such cases, the boot loader must be recovered in order to restore device operation.

Creating the Recovery SD Card

• Download the the compressed recovery image.
• Decompressed image and write it to a microSD card:

unzip -p iot-gate-imx8_firmware-recovery-image.zip | sudo dd status=progress of=/dev/sdX 

Where /dev/sdX is the host system device node for the microSD card.

Flashing the Device U-Boot

• Insert the recovery SD card into the IOTG-ACC-M2SD module (see evaluation kit).
• Power off the IOT-GATE-iMX8/SBC-IOT-iMX8 unit.
• Connect the debug console.
• Install the IOTG-ACC-M2SD module in socket P14 (first remove the secondary storage module, if installed).
• Install the jumper E1.
• Power on the IOT-GATE-iMX8/SBC-IOT-iMX8 unit.
• Wait untill the SUCCESS printout appears on the console.
• Power off the IOT-GATE-iMX8/SBC-IOT-iMX8 unit.
• Remove the module IOTG-ACC-M2SD and jumper E1.
• Power on the IOT-GATE-iMX8/SBC-IOT-iMX8 unit.
• Verify the device boots successfully.