[U-Boot] U-boot PPC405EX with DDR2 DIMM

[Rommel Custodio]

Dear Steve Miller,

Steve Miller <stevem <at> tanisys.com> writes:
>

<snipped>

> 
> Questions:
> 
> 1.        Has anyone compiled u-boot for the 405EX using a DIMM, aka an
> SPD defined RAM?
> 
> 2.       Is there something obvious that I need to place in the config
> to get this to work?   I compared this config to another product that
> uses a 460SX.  I did not see anything special that the 460SX was
> configuring to make the system work with the SPD of the DIMM.  

I have not directly worked with the 405 (only 440 and 465).

FWIW, defining CONFIG_DDR_SPD is not enough in some cases. You would also need 
to adjust timing parameters and row/column bits for your specific DIMM so that 
the DDR controller can correctly access all of your memory.


All the best,
Rommel