[LinuxBIOS] Does MA map type effect MRS values?

[Corey Osgood]

Simple question that I can't seem to find the answer to _anywhere_. From
JEDEC's docs, it sounds like it should, but I can't figure out what the
relationship is. Any info would be greatly appreciated ;)

-Corey

[Segher Boessenkool]

> Simple question that I can't seem to find the answer to _anywhere_.  
> From
> JEDEC's docs, it sounds like it should, but I can't figure out what  
> the
> relationship is. Any info would be greatly appreciated ;)

What is "MA map type"?  Are you talking about DDR1, DDR2,
DDR3, some GDDR, or what else, anyway?  :-)

Segher

[Corey Osgood]

Segher Boessenkool wrote:
> > Simple question that I can't seem to find the answer to _anywhere_. From
> > JEDEC's docs, it sounds like it should, but I can't figure out what the
> > relationship is. Any info would be greatly appreciated ;)
>
> What is "MA map type"?  Are you talking about DDR1, DDR2,
> DDR3, some GDDR, or what else, anyway?  :-)
>
> Segher

Sorry, Memory Address map type, in relation to the via cn700 (or any via
northbridge) and ddr2 ram. And the answer appears to be that it doesn't,
since the system is now working with either of two different MA map type
settings (yay!).

-Corey

[Segher Boessenkool]

> > > Simple question that I can't seem to find the answer to  
> > > _anywhere_. From
> > > JEDEC's docs, it sounds like it should, but I can't figure out  
> > > what the
> > > relationship is. Any info would be greatly appreciated ;)
> >
> > What is "MA map type"?  Are you talking about DDR1, DDR2,
> > DDR3, some GDDR, or what else, anyway?  :-)
> Sorry, Memory Address map type, in relation to the via cn700 (or  
> any via
> northbridge) and ddr2 ram. And the answer appears to be that it  
> doesn't,
> since the system is now working with either of two different MA map  
> type
> settings (yay!).

Ah, sounds like it just selects between two different kinds
of address interleaving.  Typically, one is best for random
access, and the other is best for accessing big blocks of
data.

In the (E)MRS regs, you only need to set things like CL, AL,
and termination settings.  It's quite important to get those
right of course ;-)

Segher

[ron minnich]

I think segher got it right, IIRC MA is for interleaving. It is
somewhat dependent on how the DIMM is wired in older systems IIRC ...

ron