Jerry,

The 83xx chips have a separate memory bus for DDR, with its own chip selects.  For these chips, you do in fact need to use the local bus CS0 for your boot flash/EEPROM.

I can't find anything in the manual that differentiates between the DDR chip selects, so using CS2/3 was probably just a design choice.

regards,
Ben

On Tue, 2006-04-18 at 10:02 -0400, Jerry Van Baren wrote: 
Aziz Mzili wrote:
> 
> Hi
> 
> I'm wondering why in cpu/83xx/spd_ram.c we expect the DDR ram to be on 
> cs2 and cs3. Is there any issue with it on cs0 and cs1 ?
> 
> thank you
> 
> Aziz Mzili

I'm not a 834x expert, but all my experience is that CS0 is used to boot 
the processor.  If it is DDR RAM rather than flash, someone other than 
the 834x must initialize the DDR RAM and load it with the boot program. 
  That is possible, but very uncommon.

gvb


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