Recovery U-Boot Image (Lizard)

Introduction

This article describe how to recover a corrupted U-Boot image on Lizard NOR Flash using a Windows host machine.

In brief user needs to:

• configure Lizard SOM to boot over serial port instead of on board NOR flash
• download and prepare serial communication tools
• use those tools to download first stage bootloader and U-Boot over UART
• use this U-Boot to update NOR flash

This assume that you're using a standard LELK hardware and software.

Tool Preparation

• Download the lizard-recovery.zip archive and extract it on your Windows PC
• If needed, replace the u-boot.bin file with your custom binary or download the latest LELK binary from DAVE Embedded Systems mirror
• Open the command prompt and go inside the folder where you extracted the recovery file
• Launch the utility with the serial port number as the argument

C:\Users\Desktop\lizard-Recovery\lizard> .\uart-recovery.bat COM1

The tools is now waiting for the board to wakeup

Info Box Applies to Lizard Applies to LizardEVB-Lite

Board Preparation

• Power off the board and set the dip switch S2.2 ON to select serial boot
• Connect UART2 to your host PC
• Turn on the board

Flashing the firmware

Once the board boot up, after a couple of seconds of delay, the recovery procedure will start.

The script is totally automated and, in case of success, this is the output: