[U-Boot-Users] u-boot 834x spd_ram

[Ben Warren <bwarren@qstreams.com>]

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
> 
> 
> -------------------------------------------------------
> This SF.Net email is sponsored by xPML, a groundbreaking scripting language
> that extends applications into web and mobile media. Attend the live webcast
> and join the prime developer group breaking into this new coding territory!
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642
> _______________________________________________
> U-Boot-Users mailing list
> U-Boot-Users at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/u-boot-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.denx.de/pipermail/u-boot/attachments/20060418/a8733983/attachment.htm