Hi!
> > I glanced at the manual. Uhh, DataFlash is very specific beast. It
> > suppoers page program with built-in erase command... So DataFlash
> > effectively may be considered as a block device. Then you may use any FS
> > on it providing you have wrote proper driver? Why do you need JFFS2 then
> > :-) ?
>
> Still can't. Block devices have the attribute that writing AAA... to
> a block containing BBB... gives you one of three possible results in
> case of power failure:
>
> 1. BBB...BBB all written
> 2. AAA...AAA nothing written
> 3. AAA...BBB partially written.
>
> Flash doesn't have 3, but two more cases:
> 4. FFF...FFF erased, nothing written
> 5. AAA...FFF erased, partially written
>
> Plus the really obnoxious
> 6. FFF...FFF partially erased. Looks fine but some bits may flip
> randomly, writes may not stick, etc.
>
> Now try finding a filesystem that is robust if 4-6 happens. ;)
ext2 and anything that does not do journalling?
I do not thing behaviour on powerfail is part of block device definition.
Pavel
--
64 bytes from 195.113.31.123: icmp_seq=28 ttl=51 time=448769.1 ms
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