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Subjectstill mtrr problems

Hello,

when installing 8G RAM on an Intel DG965OT motherboard Linux will hang at
boot (or parhaps only become very very slow) if I dont add the boot option
mem=8192M, Windows Vista 64-bit works without any probelm on the same
hardware.

/proc/mtrr:
reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1
reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
reg02: base=0xc0000000 (3072MB), size= 256MB: write-back, count=1
reg03: base=0xcf800000 (3320MB), size= 8MB: uncachable, count=1
reg04: base=0xcf700000 (3319MB), size= 1MB: uncachable, count=1
reg05: base=0x100000000 (4096MB), size=4096MB: write-back, count=1
reg06: base=0x200000000 (8192MB), size= 512MB: write-back, count=1
reg07: base=0xd0000000 (3328MB), size= 256MB: write-combining, count=1

dmesg|grep e820:
[ 0.000000] BIOS-e820: 0000000000000000 - 000000000008f000 (usable)
[ 0.000000] BIOS-e820: 000000000008f000 - 00000000000a0000 (reserved)
[ 0.000000] BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
[ 0.000000] BIOS-e820: 0000000000100000 - 00000000cf561000 (usable)
[ 0.000000] BIOS-e820: 00000000cf561000 - 00000000cf56e000 (reserved)
[ 0.000000] BIOS-e820: 00000000cf56e000 - 00000000cf637000 (usable)
[ 0.000000] BIOS-e820: 00000000cf637000 - 00000000cf6e9000 (ACPI NVS)
[ 0.000000] BIOS-e820: 00000000cf6e9000 - 00000000cf6ed000 (usable)
[ 0.000000] BIOS-e820: 00000000cf6ed000 - 00000000cf6f2000 (ACPI data)
[ 0.000000] BIOS-e820: 00000000cf6f2000 - 00000000cf6f3000 (usable)
[ 0.000000] BIOS-e820: 00000000cf6f3000 - 00000000cf6ff000 (ACPI data)
[ 0.000000] BIOS-e820: 00000000cf6ff000 - 00000000cf700000 (usable)
[ 0.000000] BIOS-e820: 00000000cf700000 - 00000000d0000000 (reserved)
[ 0.000000] BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved)
[ 0.000000] BIOS-e820: 0000000100000000 - 000000022c000000 (usable)


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