Hi everyone,
I'm currently using a UBIFS root file system (stored on SPI-NOR flash) and would like to perform a full integrity check before booting it. The rootfs is read-only and until now, I've been computing an md5sum on the whole mtd device from an initramfs and comparing it to a stored md5sum. If both md5sums don't match, I need to stop the boot process completely.
If possible, I was hoping to drop initramfs and do the integrity check from U-Boot. I know UBI/UBIFS does a CRC-32 of the data it writes to flash but the intent here is to prevent booting an image where even a _single bit_ of flash may have been corrupted.
My question is, does UBI/UBIFS have this kind of complete integrity check built-in? If not, can I take advantage of these CRC-32, to do something equivalent to my md5sum check from U-Boot. Thanks,
Liam Beguin Xiphos Systems Corp. http://xiphos.com