Recovery U-Boot Image (Lizard)

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Lizard.jpg Applies to Lizard
Lizard-evb-02.png Applies to LizardEVB-Lite

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

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:


C:\devel\lizard\recovery2\windows>uart-recovery.bat COM15
transfer the x-loader
Waiting For Device ASIC ID: Press Ctrl+C to stop
ASIC ID Detected.
Sending 2ndFile:
Downloading file: 100.000% completed(15232/15232 bytes)
File download completed.
transfer u-boot
Downloading file: 100.000% completed(221852/221852 bytes)
File Download completed
trasfer u-boot to be stored on flash

Waiting for 0 seconds, press a key to continue ...

C:\devel\lizard\recovery2\windows>ucmd -p COM15 -c "STOP" -e "=>"
Output:
Net:   davinci_emac_initialize
Ethernet PHY: GENERIC @ 0x11
DaVinci EMAC
=>
Match Found. Operation completed!

C:\devel\lizard\recovery2\windows>ucmd -p COM15 -c "mw.w ${buf} 0xFF 0x40000; loadb ${buf} 115200" -e "Ready for binary"
Output:
mw.w ${buf} 0xFF 0x40000; loadb ${buf} 115200
## Ready for binary
Match Found. Operation completed!
Downloading file: 100.000% completed(221852/221852 bytes)
File Download completed
flashing u-boot

Waiting for 0 seconds, press a key to continue ...

C:\devel\lizard\recovery2\windows>ucmd -p COM15 -c "protect off 0x08000000 +40000;era 0x08000000 +40000;cp.b ${buf} 0x08000000 0x40000" -e "Copy to Flash... done"
Output:
protect off 0x08000000 +40000;era 0x08000000 +40000;cp.b ${buf} 0x08000000 0x40000
Un-Protected 2 sectors

.. done
Erased 2 sectors
Copy to Flash... done
Match Found. Operation completed!
recovery completed

User can now:

  • turn off the board
  • restore original dip switch configuration S2.2 OFF
  • power on the board again to see the restored U-Boot startup