75xx spiflash restore

This needs to be done directly on the SBC. You can find the latest SPI image here. Once downloaded you can decompress the image using bzip2:

bzip2 -d 4mb-spiflash-latest.dd.bz2

Some of this series contains a 4MB SPIflash embedded on the board that can be written to by specifying lun 0, or "-l 0" which will use that chip select. The offboard flash found on various baseboards, or console boards like the TS-9448 or TS-9449 can be written to using lun 1, or "-l 1".

Backup

Backup the entire SPI flash containing the MBR, Kernel, and initrd

spiflashctl -l 1 -R 64 -z 65536 > spiflash.dd

Backup only the Kernel

spiflashctl -l 1 -R 4095 -z 512 -k part1 > /temp/zImage

Backup only the Initrd

spiflashctl -l 1 -R 32 -z 65536 -k part2 > /temp/initrd

Restore

Write the entire SPI flash containing the MBR, Kernel, and initrd

spiflashctl -l 1 -W 64 -z 65536 -i /path/to/4mb-spiflash-latest.dd

Write a new Kernel

spiflashctl -l 1 -W 4095 -z 512 -k part1 -i /temp/zImage

Write a new Initrd

spiflashctl -l 1 -W 32 -z 65536 -k part2 -i /temp/initrd