Re: [LinuxBIOS] question about via chipset v-link and ram init

[Corey Osgood]

aaron lwe wrote:
> On Dec 10, 2007 10:19 AM, Corey Osgood <[e-mail]
> > wrote:
> aaron lwe wrote:
> > Dear all,
> >
> > the via v-link bus is for data communication between northbridge and
> > sourthbridge,
> > if I just want to make dram work, do I need to configure the
> v-link bus?
> >
> > thanks.
>
> No, vlink can be handled before or after ram init, and it isn't even
> necessary, if no config is done it will default to the slowest
> operating
> mode (newer chipsets may bootstrap to higher modes, depending on
> motherboard design). However, you do have to program the CPU bus
> registers and all the various dram config registers before ram init.
> Getting these settings right may be a real pain, depending on what
> chipset you're dealing with.
>
> -Corey
>
>
> Thanks Corey. I've been trying to make cn700 work, until now without luck.
> I've programmed host bus and some dram controller registers, but not all.
> how can I know which registers should be programmed and which needn't?
> can you give me some advices? thanks.

I'm already nearly done with the cn700, please try the attached patch. I
apologize if there's any cruft in there, I'm working on another project
right this moment, so I don't have time for a good cleanup.

-Corey