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

Alexander Clouter alex at digriz.org.uk
Sat Jan 8 07:30:34 EST 2011

Alexander Clouter <alex at digriz.org.uk> wrote:
>> On Tue, Jan 04, 2011 at 11:51:59PM +0000, Alexander Clouter wrote:
>>> 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.  


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

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