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

[aaron lwe]

On Dec 10, 2007 10:19 AM, Corey Osgood <corey.osgood at gmail.com> 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.
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