[U-Boot] [PATCHv4] Optimized nand_read_buf for kirkwood

[Scott Wood <scottwood@freescale.com>]

On Mon, 2013-08-26 at 14:10 +0200, Phil Sutter wrote:
> From: Nico Erfurth <ne@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 <ne@erfurth.eu>
> Tested-by: Phil Sutter <phil.sutter@viprinet.com>
> Cc: Prafulla Wadaskar <prafulla@marvell.com>
> ---
> Changed since V3:
> - fixed author

It needs your Signed-off-by: as well -- can I add that when applying?

-Scott