jffs2 crc errors

[arne anka]

since sunday i had a few deep freezes when booting debian -- first i  
blamed some upgraded packages and downgraded them but yesterday night at  
two subsequent boots the moment X should start the backlight was dimm and  
nothing happend. pressing pwr did not help anything -- connecting via ssh  
failed (no response), i had to remove the battery.

next boot i was able to login before X starts and stop that.
starting X manually gave a message saying something like

jffs crc error checksums differ expected something calculated somethingelse

since it was rather late i did not write down the exact wording, but maybe  
one of the hardware guys is able to give a hint what that means, how to  
remedy and if it may cause the freeze?

i have debian partially in flash and partially (/usr and /var) on sd card.  
moving debian to flash was done by simply rm'in everything in flash and  
rsync'ing everything except /usr and /var.