On Mon, Aug 26, 2013 at 02:10:56PM +0200, Phil Sutter wrote:
> From: Nico Erfurth <n...@erfurth.eu>
>
> The basic idea is taken from the linux-kernel, but further optimized.
>
> First align the buffer to 8 bytes, then use ldrd/strd to read and store
> in 8 byte quantities, then do the final bytes.
>
> Tested using: 'date ; nand read.raw 0xE00000 0x0 0x10000 ; date'.
> Without this patch, NAND read of 132MB took 49s (~2.69MB/s). With this
> patch in place, reading the same amount of data was done in 27s
> (~4.89MB/s). So read performance is increased by ~80%!
>
> Signed-off-by: Nico Erfurth <n...@erfurth.eu>
> Tested-by: Phil Sutter <phil.sut...@viprinet.com>
> Cc: Prafulla Wadaskar <prafu...@marvell.com>
>
> ---
> Changed since V3:
> - fixed author
> ---
> drivers/mtd/nand/kirkwood_nand.c | 32 ++++++++++++++++++++++++++++++++
> 1 file changed, 32 insertions(+)
I tried to build-test this, and I couldn't find any board that defines
CONFIG_NAND_KIRKWOOD.
The patch that removed it was commit
b5befd8211b54ae2d2fca3fbed061c879951ceaa ("arm/km: fix u-boot.kwb build
breakage"), over two years ago. It's not clear whether the removal was
intentional.
What target did you use to test this?
-Scott
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