[PATCH] [ARM] orion5x: accelerate NAND on the TS-78xx

Alexander Clouter [off-list ref] wrote:

quoted

On Tue, Jan 04, 2011 at 11:51:59PM +0000, Alexander Clouter wrote:

quoted

The NAND supports 32bit reads and writes so lets stop shunting 8bit
chunks across the bus.

Doing a dumb 'dd' benchmark, this increases performance roughly like so:
 * read: 1.3MB/s to 3.4MB/s
 * write: 614kB/s to 882kB/s

Try something like the below.  It's slightly more typing, but the
underlying string IO functions should improve your transfer speed.
Note that they won't do endian conversions.

I get roughly the same speeds with your approach...I am happy to swing 
either your way or my original implementation; well actually it was 
stolen from Nico's orion_nand implementation :)

What should I submit?  These functions will at somestage get DMA support 
added.

I decided I prefer your version and it 'hides' the while loops and is 
easier to read.  

Cheers

-- 
Alexander Clouter
.sigmonster says: What!?  Me worry?
                  		-- Alfred E. Newman