2001-10-13 05:15:34

by Jeffrey H. Ingber

Subject: ServerWorks LE MTRR's disabled?

Hi,

MTRR's for ServerWorks LE chipsets are disabled in
arch/i386/kernel/mtrr.c. What particular problem does this chipset
have? I have a revision 5 board which does infact work properly with
MTRR's. The system is an IBM NetFinity 5600 with 2 PIII's 800's. Is
this problem dependant on certain board/configurations? If so, might
there be a better workaround than disabling MTRR entirely?

Thanks,
Jeffrey H. Ingber (jhingber _at_ ix.netcom.com)


00:00.0 Host bridge: ServerWorks CNB20LE (rev 05)
00:00.1 Host bridge: ServerWorks CNB20LE (rev 05)
00:01.0 VGA compatible controller: S3 Inc. Trio 64 3D (rev 01)
00:02.0 Ethernet controller: Advanced Micro Devices [AMD] 79c970 [PCnet
LANCE] (rev 44)
00:0a.0 PCI bridge: Digital Equipment Corporation DECchip 21152 (rev 03)
00:0f.0 ISA bridge: ServerWorks OSB4 (rev 4f)
00:0f.1 IDE interface: ServerWorks: Unknown device 0211
00:0f.2 USB Controller: ServerWorks: Unknown device 0220 (rev 04)
01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G200 AGP
(rev 03)
01:04.0 Display controller: Matrox Graphics, Inc. MGA G200 AGP (rev 03)
01:08.0 Display controller: Matrox Graphics, Inc. MGA G200 AGP (rev 03)
01:0c.0 Display controller: Matrox Graphics, Inc. MGA G200 AGP (rev 03)
02:03.0 SCSI storage controller: Adaptec 7896
02:03.1 SCSI storage controller: Adaptec 7896
02:07.0 SCSI storage controller: Adaptec 7892B (rev 02)

2001-10-13 14:46:39

by Matt Domsch

Subject: RE: ServerWorks LE MTRR's disabled?

> MTRR's for ServerWorks LE chipsets are disabled in
> arch/i386/kernel/mtrr.c. What particular problem does this chipset
> have? I have a revision 5 board which does infact work properly with
> MTRR's. The system is an IBM NetFinity 5600 with 2 PIII's 800's. Is
> this problem dependant on certain board/configurations? If so, might
> there be a better workaround than disabling MTRR entirely?

There was some speculation that LE rev. 5 chips don't have a problem, but no
definitive answer from ServrWorks yet that I'm aware of.


--
Matt Domsch
Sr. Software Engineer
Dell Linux Solutions
http://www.dell.com/linux
#2 Linux Server provider with 17% in the US and 14% Worldwide (IDC)!
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