Re: [U-Boot] [U-Boot,v3,1/2] Optimized nand_read_buf for kirkwood

On Wed, Jun 26, 2013 at 08:25:25PM +0200, Phil Sutter wrote:

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

Missing your signoff, and if Nico was the main author then there should be a From: line indicating that.

-Scott