flash

Andy Green andy at openmoko.com
Tue Jul 8 16:58:15 CEST 2008


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Somebody in the thread at some point said:

| Jffs2 is just a symptom of writing direct to raw NAND...  we don't need
| to deal with these unusual formats when our storage is SD Card.  In that
| future, we use the very well characterized ext2 or ext3.
|
|> but that doesn't help- as such we have our OS on "on-chip" flash.
that's where
|> it is. it's nastily slow (2mb/sec read rates is what i clocked on the
mtdblock
|> devices themselves, so bypassing jffs2 overhead). am i wrong i
suspecting our
|> flash SHOULD be much faster? (like 5-10x faster)? this is for freerunner.
|> future devices is... another matter :)

Well we can boot SD on GTA02.  But I really mean it's not obvious we
should make a big investment into a new raw mtd filesystem given where
we are headed.

Practically, there's likely something wrong with how we use jffs2 from
cradle to grave and we probably get a better result looking at that.

- -Andy
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