* JFFS2 Max Flash Size?
@ 2007-02-28 21:17 Johnson, Charles F
2007-02-28 21:29 ` Josh Boyer
2007-03-01 20:37 ` Charles Manning
0 siblings, 2 replies; 3+ messages in thread
From: Johnson, Charles F @ 2007-02-28 21:17 UTC (permalink / raw)
To: linux-mtd
I've heard there is scalability issues with JFFS2 with large flash
sizes. So my question on this list is for a NAND flash design, is
there a maximum size that JFFS2 can handle ?? 4GB, 8GB, ????
Charles Johnson
Ultra-Mobility Group
Platform Software Engineering
Intel Corporation
charles.f.johnson@intel.com
503-712-5181
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: JFFS2 Max Flash Size?
2007-02-28 21:17 JFFS2 Max Flash Size? Johnson, Charles F
@ 2007-02-28 21:29 ` Josh Boyer
2007-03-01 20:37 ` Charles Manning
1 sibling, 0 replies; 3+ messages in thread
From: Josh Boyer @ 2007-02-28 21:29 UTC (permalink / raw)
To: Johnson, Charles F; +Cc: linux-mtd
On Wed, 2007-02-28 at 13:17 -0800, Johnson, Charles F wrote:
> I've heard there is scalability issues with JFFS2 with large flash
> sizes. So my question on this list is for a NAND flash design, is
> there a maximum size that JFFS2 can handle ?? 4GB, 8GB, ????
4GiB is the maximum that JFFS2 can address given that it uses uint32_t
variables for offsets, etc.
You'll likely hit scaling issues long before that though. Depending on
various factors, a 1GiB image can be slow.
josh
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: JFFS2 Max Flash Size?
2007-02-28 21:17 JFFS2 Max Flash Size? Johnson, Charles F
2007-02-28 21:29 ` Josh Boyer
@ 2007-03-01 20:37 ` Charles Manning
1 sibling, 0 replies; 3+ messages in thread
From: Charles Manning @ 2007-03-01 20:37 UTC (permalink / raw)
To: linux-mtd; +Cc: Johnson, Charles F
On Thursday 01 March 2007 10:17, Johnson, Charles F wrote:
> I've heard there is scalability issues with JFFS2 with large flash
> sizes. So my question on this list is for a NAND flash design, is
> there a maximum size that JFFS2 can handle ?? 4GB, 8GB, ????
I don't know where JFFS2 hits the wall, theoretically or practically, but I do
know that people are using YAFFS on 6GB partitions.
YAFFS does use u32s internally but only thinks in pages and 32-bits worth of
pages go a long way. You'll hit practical limits (like RAM required) long
before that.
-- Charles
^ permalink raw reply [flat|nested] 3+ messages in thread
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