[U-Boot-Users] u-boot 834x spd_ram
Ben Warren
bwarren at qstreams.com
Tue Apr 18 16:07:35 CEST 2006
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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