[LINUX-ABIT] MTRR Settings

[Paolo Nenzi]

Hi all,

I have read the thread on MTRR settings on Linux. While this subject is
not specific to the BP6, I would like to ask for some clarifications on
the subject. I have read the mtrr.txt file in the Linux Kernel Docs but
understand very little. 

I have a TNT2 card with 32MB of memory. What are the best settings ?

On the doc is written:

      BASE ADDRESS OF VRAM   SIZE in HEX
           /\                 /\
           ||                 ||
echo "base=0xf8000000 size=0x400000 type=write-combining" 


I should write: echo "base=0xe6000000 size="0x200000
type=write-combining", where 0xe6000000 is the base address of
prefetchable memory, as reported by cat /proc/pci:

VGA compatible controller: NVidia Unknown device (rev 17).
      Vendor id=10de. Device id=28.
      Medium devsel.  Fast back-to-back capable.  IRQ 16.  Master Capable.
Latency=32.  Min Gnt=5.Max Lat=1.
      Non-prefetchable 32 bit memory at 0xe4000000 [0xe4000000].
      Prefetchable 32 bit memory at 0xe6000000 [0xe6000008].


Thank you,
Paolo Nenzi

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