[U-Boot] [PATCH RFC] NAND: Improve read performance from Large Page NAND devices

Wolfgang Denk
2009-12-08T22:06:02Z

Dear Nick Thompson,

In message <4B1E71D9.6080802@ge.com> you wrote:
> Improve read performance from Large Page NAND devices.
>
> This patch produces a ~31% improvement in oob_first read speed (on a
> 300MHz ARM9). The time for a mid-buffer 2k page read is now 293us,
> 6.99MB/s (was 385us, 5.31MB/s). oob_first is probably the best case
> improvement.
>
> Signed-off-by: Nick Thompson <nick.thompson@ge.com>

I tested this on mpc5121ads (sector size 128 KiB) and sequoia (sector
size 16 KiB).

The patch applied not cleanly against "master" (but was easy to fix).

However, I did not notice any changes to the speed for a "nand read"
at all.

Is this not the right flash types, or not thr right type of test?

Best regards,

Wolfgang Denk

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