* JFFS2 Control Mode Program on Sibley
@ 2006-05-25 8:24 Davide CASCONE
2006-05-25 13:47 ` Nishanth Menon
2006-05-25 14:01 ` Nicolas Pitre
0 siblings, 2 replies; 3+ messages in thread
From: Davide CASCONE @ 2006-05-25 8:24 UTC (permalink / raw)
To: linux-mtd
Does JFFS2 use the Control Mode Program on Sibley device? After a my preliminary analysis, it seems that only the Object Mode Program is used. Is it right?
Thanks in advance,
Best Regards
Davide
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: JFFS2 Control Mode Program on Sibley
2006-05-25 8:24 JFFS2 Control Mode Program on Sibley Davide CASCONE
@ 2006-05-25 13:47 ` Nishanth Menon
2006-05-25 14:01 ` Nicolas Pitre
1 sibling, 0 replies; 3+ messages in thread
From: Nishanth Menon @ 2006-05-25 13:47 UTC (permalink / raw)
To: Davide CASCONE; +Cc: linux-mtd
Davide CASCONE wrote:
> Does JFFS2 use the Control Mode Program on Sibley device? After a my preliminary analysis, it seems that only the Object Mode Program is used. Is it right?
>
That is correct Davide. the reason for that is that in Control mode, one
of the A/B halfs cannot be written, in short we only get 16 bits of
contiguous data in memory.
The neagitve part of using only Object mode is that Of the programming
regions/sector, we loose one complete region for the cleanmarker..
something like 128K(? dont remember off hand) for 8/12 bytes of
cleanmarker/EBH and hence the implementation using write buffering
(something we do on nand-like flash devices) on M18 flashes.
Regards,
Nishanth Menon
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: JFFS2 Control Mode Program on Sibley
2006-05-25 8:24 JFFS2 Control Mode Program on Sibley Davide CASCONE
2006-05-25 13:47 ` Nishanth Menon
@ 2006-05-25 14:01 ` Nicolas Pitre
1 sibling, 0 replies; 3+ messages in thread
From: Nicolas Pitre @ 2006-05-25 14:01 UTC (permalink / raw)
To: Davide CASCONE; +Cc: linux-mtd
On Thu, 25 May 2006, Davide CASCONE wrote:
>
> Does JFFS2 use the Control Mode Program on Sibley device?
No.
> After a my preliminary analysis, it seems that only the Object Mode
> Program is used. Is it right?
Yes.
The Sibley "Control Mode" is just too awkward for JFFS2 to take
advantage of without major modifications.
Nicolas
^ permalink raw reply [flat|nested] 3+ messages in thread
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2006-05-25 8:24 JFFS2 Control Mode Program on Sibley Davide CASCONE
2006-05-25 13:47 ` Nishanth Menon
2006-05-25 14:01 ` Nicolas Pitre
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