scanmsr.c is Dave Jone's MSR scan program. 
scanmsrout is the result of a 16-hour run to get ALL k7 msrs.
fixmsr.c is our program that reloads the 0xcxxxxxxx MSRs for different
memory configurations. 


Here is the basic note on K7 MSR mods for LinuxBIOS

K7 (non-SMP) fixed (at least on SiS 730)
Date: Thu, 1 Nov 2001 15:14:28 -0700
From: Ronald G Minnich <rminnich@lanl.gov>
To: linuxbios@snaresland.acl.lanl.gov


I got kind of tired waiting for this to get fixed. There are people out there 
who have product plans that are really getting messed up by this whole 
business. It seemed time to help them out. 

So I did the following. 

First, using David Jone's MSR reading program, I read all the  K7 MSRs by 
walking the entire 2^32 space. This took about 16 hours. Then I did the same 
thing on a PII. Then I compared the output of the two runs to isolate the 
MSRs that are K7-specific. Turns out there is a range of K7 MSRs at 
0xcxxxxxxx not found on any Pentium. These looked like they might be worth 
trying. There were hidden MSRs on the PII to manipulate the cache; it was 
worth seeing if these MSRs would fix the performance problem. 

Then, for every combination of DRAM I care about, I plugged in:
1x128
2x128
1x256
2x256
128+256
256+128

And then dumped the 0xcxxxxxxx MSRs. Then I wrote a program that sets the 
MSRs based on this DRAM configuration. The idea is to boot under linuxbios, 
then run this program, set the MSRs as set by the BIOS, and see if things 
work. 

The result is I can boot linuxbios, run my program, and get good K7 behavior. 
I am not intepreting what MSR does what. I am simply loading all the MSRs 
that seem to be K7-specific. This code will be going into linuxbios in the 
next day or so. It will be in the K7 setup code. Obviously, if you plug in a 
non-supported DRAM configuration I can't help you. But this is at least a 
start. 

So, it appears that for K7 uniprocessor, with 2 dram slots, and variations of 
128 and 256 MB, we are back on the air. 

Note that no NDA material was used in the making of this code. It is a very 
straightforward loading of MSRs, as programmed by the normal BIOS, into the 
MSRs in a LinuxBIOS system. Also no reverse assembly, etc. was used. All I did
was run a program that queries the MSR space. 

Finally, the conclusion: NDAs are stupid. 

The program is attached. To invoke it you run 'fixmsr <variation>' where 
variation is a variation of memory config. This is here for reference only, 
this code will be going into linuxbios so you don't need to care how it works.

ron