Hi,
I would like to validate the integrity (checksum) of a squashfs root file
system before starting Linux.
Current strategy I am using is:
- Wrap squashfs rootfs inside a u-boot image
- TFTP download on the target
- Download validation using iminfo
- Save squashfs rootfs in flash without the image header (Linux failed to load
squashfs rootfs if u-boot image is present)
Problems:
- I need to hardcode squashfs rootfs offset in u-boot image in order to be able
to flash it
- U-Boot image header information (size, crc, ...) is lost after a reboot. It
is not possible to check the integrity of the flash content.
I would like to save some fields of u-boot image header (size, crc, ...) in
u-boot environment variables. And then do an integrity check at boot time.
I have not find a way to extract those fields and save them without changing
u-boot code.
I have added some code to “iminfo” command to set environment variables for
CRC, size, payload offset, timestamp.
Is it an acceptable way of doing it?
Is there a better way of doing it?
Thanks in advance,
Pascal
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