Bug 41856

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Description of problem:
I'm getting lots of messages in dmesg about the mtrr register:

eg...

mtrr: type mismatch for d4000000,2000000 old: write-back new: write-combining
mtrr: type mismatch for d4000000,1000000 old: write-back new: write-combining
mtrr: type mismatch for d4000000,1000000 old: write-back new: write-combining
mtrr: type mismatch for d4000000,2000000 old: write-back new: write-combining
mtrr: type mismatch for d4000000,1000000 old: write-back new: write-combining
mtrr: type mismatch for d4000000,1000000 old: write-back new: write-combining

(I'm not sure whether this is having a dangerous impact on the machine, but
it hasn't crashed yet... The onboard sound is broken, which I'm going to
report as another bug)


How reproducible:
Always

Steps to Reproduce:
1.


Additional info:


cat /proc/mtrr:
reg00: base=0x00000000 ( 0MB), size=16712192MB: write-back, count=1
reg05: base=0xd0000000 (3328MB), size=16711744MB: write-combining, count=1

The system is an Athlon 1300.
cat /proc/cpuinfoprocessor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 4
model name : AMD Athlon(tm) Processor
stepping : 2
cpu MHz : 1299.414
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36
mmx fxsr syscall mmxext 3dnowext 3dnow
bogomips : 2588.67

xpc1:~> cat /proc/pci
PCI devices found:
Bus 0, device 0, function 0:
Host bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133] (rev 3).
Prefetchable 32 bit memory at 0xd0000000 [0xd3ffffff].
Bus 0, device 1, function 0:
PCI bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133 AGP] (rev 0).
Master Capable. No bursts. Min Gnt=12.
Bus 0, device 7, function 0:
ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev 64).
Bus 0, device 7, function 1:
IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 6).
Master Capable. Latency=32.
I/O at 0xd000 [0xd00f].
Bus 0, device 7, function 2:
USB Controller: VIA Technologies, Inc. UHCI USB (rev 22).
IRQ 5.
Master Capable. Latency=32.
I/O at 0xd400 [0xd41f].
Bus 0, device 7, function 3:
USB Controller: VIA Technologies, Inc. UHCI USB (#2) (rev 22).
IRQ 5.
Master Capable. Latency=32.
I/O at 0xd800 [0xd81f].
Bus 0, device 7, function 4:
Host bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 64).
IRQ 9.
Bus 0, device 7, function 5:
Multimedia audio controller: VIA Technologies, Inc. AC97 Audio Controller
(rev 80).
IRQ 11.
I/O at 0xdc00 [0xdcff].
I/O at 0xe000 [0xe003].
I/O at 0xe400 [0xe403].
Bus 0, device 12, function 0:
Ethernet controller: Intel Corporation 82557 [Ethernet Pro 100] (rev 12).
IRQ 10.
Master Capable. Latency=32. Min Gnt=8.Max Lat=56.
Non-prefetchable 32 bit memory at 0xda020000 [0xda020fff].
I/O at 0xec00 [0xec3f].
Non-prefetchable 32 bit memory at 0xda000000 [0xda01ffff].
Bus 1, device 0, function 0:
VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP (rev 130).
IRQ 5.
Master Capable. Latency=32. Min Gnt=16.Max Lat=32.
Prefetchable 32 bit memory at 0xd4000000 [0xd5ffffff].
Non-prefetchable 32 bit memory at 0xd6000000 [0xd6003fff].
Non-prefetchable 32 bit memory at 0xd7000000 [0xd77fffff].