[LinuxBIOS] Opteron memclk speed/loading fix

YhLu YhLu at tyan.com
Fri May 6 19:04:47 CEST 2005


That's right.

Some MB can work with 4G 4 ranks DIMM in 400Mhz in 4 slots. 

YH

> -----Original Message-----
> From: ebiederman at lnxi.com [mailto:ebiederman at lnxi.com] 
> Sent: Friday, May 06, 2005 7:55 AM
> To: Tao Liu
> Cc: YhLu; LinuxBIOS
> Subject: Re: [LinuxBIOS] Opteron memclk speed/loading fix
> 
> Tao Liu <liutao1980 at gmail.com> writes:
> 
> > Hello,
> > 
> > we are building an 1 cpu 8 dimm board and experienced this problem, 
> > and accroding to amd's amd64 bios developers' guide memory speed 
> > downgrade should also be applyed to the following 4dimm 
> configurations:
> > 
> > (1)  4 dimm with more than 2 double-rank dimms, downgrade to 333MHz
> > (2)  more than 1 double-rank dimm for single channel, downgrade to 
> > 333MHz
> 
> In principle I agree with this.  However those are guidelines 
> and it stated that the actual details may very per motherboard.
> 
> So for merging I would request we have a generic function 
> that performs this logic,  and have the generic call in 
> raminit.c make a motherboard specific call.  By default that 
> motherboard specific call would simply call the default 
> generic method, but a motherboard that has better memory 
> stability could override this.
> 
> Eric
> 




More information about the coreboot mailing list