[LinuxBIOS] question about via chipset v-link and ram init
corey.osgood at gmail.com
Mon Dec 10 06:57:48 CET 2007
aaron lwe wrote:
> On Dec 10, 2007 10:19 AM, Corey Osgood <corey.osgood at gmail.com
> <mailto: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
> 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.
> 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.
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