tffsa1 looks like the winner...
Code:
root@ereader:/proc# cat partitions
major minor #blocks name
100 0 239616 tffsa
100 1 3094 tffsa1
100 2 74256 tffsa2
100 3 1 tffsa3
100 5 29926 tffsa5
100 6 131326 tffsa6
100 7 910 tffsa7
root@ereader:/proc# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/tffsa2 3040 2368 672 78% /old-root
/dev/tffsa2 73045 60249 12796 82% /
/dev/tffsa5 28973 885 26592 3% /mnt/protected
/dev/tffsa6 131180 122848 8332 94% /mnt/free
/dev/tffsa7 888 179 664 21% /mnt/settings
I yanked it with dd and I can see why firmupdate says it has to search for the kernel. Lots of garbage at the front of that partition.