AT91RM9200-EK U-Boot from Dataflash
We currently have no way to reproduce the steps needed to boot the AT91RM9200-EK from Dataflash. There is an image, at91rm9200_recovery.bin, attached to this page that we were able to pull from a Dataflash card that will load U-Boot from dataflash. This is a good way to recover a bricked board.
This image needs to find its way onto the first block of the Dataflash card. Good practice dictates that you should create this image when you have a working U-Boot on the board already, and just use the U-Boot commands to flash it. Otherwise, you can use another working board (any AT91 board with dataflash support should be sufficient), or in the worst case, use a JTAG debugger.
Creating a Recovery Card from U-Boot
- Boot AT91RM9200-EK up to U-Boot prompt.
- Using TFTP, upload the recovery image to RAM:
U-Boot> tftp 0x21400000 at91rm9200_recovery.bin TFTP from server 10.10.0.4; our IP address is 10.10.0.15 Filename 'at91rm9200_recovery.bin'. Load address: 0x21400000 Loading: ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# #################### done Bytes transferred = 2097152 (200000 hex) - Unprotect the Dataflash sectors:
U-Boot> protect off c0000000 c083ffff Un-Protect 4 DataFlash Sectors
- Copy the image to dataflash:
U-Boot> cp.b 21400000 c0000000 200000 Copy to DataFlash... done
Running the recovery image
- Put jumper J15 on pins 1-2.
- Put dataflash card in slot J200 on the bottom of the board.
- Reset the board.
