[U-Boot] ppc4xx PPC460EX DDR2 Autocalibration errata

[Eibach, Dirk]

> Hi Dirk,

Hi Stefan,

> On Friday 11 February 2011 08:59:47 Eibach, Dirk wrote:
> > Today I received an erratum fro apm that seems to claim that ddr2 
> > autocalibration is not working properly on our 460EX 
> boards. Is anyone 
> > already working on this?
> 
> Not that I am aware of this. Perhaps somebody at AppliedMicro?

They offer an updated u-boot in the errata ...

> > Would ddr_scan_option be the way to fix this? Or should 
> > 4xx_ibm_ddr2_autocalib.c generally be fixed for 460EX?
> 
> Yes, ddr_scan_option() can be used to supply a board specific 
> fix. But a generic fix in 4xx_ibm_ddr2_autocalib.c would be 
> much better of course.

That's what I thought.

> Do you experience any possible DDR2 related problems on your 
> 460EX/GT based boards?

None that I am aware of. But it sounds scary anyway ...

> Cheers,
> Stefan

Cheers
Dirk