Re: [LinuxBIOS] Need help on epia vt8601 issues

Wed, 06 Sep 2006 13:25:23 -0700

Richard Smith wrote: 
On 9/6/06, Ronald G Minnich <[email protected]> wrote:
  
I will attempt to get you a rom image of a working linuxbios rom
tonight. I have one.

    

That would be a magic bullet.  If we can boot that, dump the
northbridge settings and compare vs what LB is currently doing then we
know a _lot_.  If they are the same then I think we have strong
evidence that something in the newer chips is different.

Please send it to "Alex Mauer" <[EMAIL PROTECTED]> and cc me.
when I get another PSU I'll boot my board up with the original bios and dump the northbridge settings.
The board I am working on is rev D. I have another board in use as a firewall and that is a rev A so I could possibly see if that works any better or if there are any details.

There are a couple of bits in the code I don't quite get. Also the VT8601A datasheet mentions a BIOS porting guide. Does anyone have a copy of that. The actual VT8601A datasheet doesn't go into any detail on configuring ram.

Have also been looking at an SDRAM datasheet to see how that gets initialised. One of the bits I don't quite get is writing the SDRAM mode register (either 0x150 or 0x1d0 ). Can't see how that matches up to the SDRAM mode register bits and would'nt the MA mapping have an effect on that. The MA mapping register doesn't get written until later.


Currently using v3 something of gcc will need to check, again when I get a PSU.

Ben



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