Comment 26 for bug 224404

Is this the same bug?

https://bugs.launchpad.net/linux/+bug/210780

the suggestion is its a bios problem.

I have:

reg00: base=0x00000000 ( 0MB), size=65536MB: write-back, count=1
reg01: base=0xcff00000 (3327MB), size= 1MB: uncachable, count=1
reg02: base=0xd0000000 (3328MB), size= 256MB: uncachable, count=1
reg03: base=0xe0000000 (3584MB), size= 512MB: uncachable, count=1

and

01:00.0 VGA compatible controller: ATI Technologies Inc Radeon HD 2400 XT (prog-if 00 [VGA controller])
 Subsystem: Dell Unknown device 0d02
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
 Latency: 0, Cache Line Size: 64 bytes
 Interrupt: pin A routed to IRQ 11
 Region 0: Memory at d0000000 (64-bit, prefetchable) [size=256M]
 Region 2: Memory at fe9f0000 (64-bit, non-prefetchable) [size=64K]

and

[ 0.000000] BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: 0000000000000000 - 000000000009e400 (usable)
[ 0.000000] BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
[ 0.000000] BIOS-e820: 0000000000100000 - 00000000cfdff800 (usable)
[ 0.000000] BIOS-e820: 00000000cfdff800 - 00000000cfe53c00 (ACPI NVS)
[ 0.000000] BIOS-e820: 00000000cfe53c00 - 00000000cfe55c00 (ACPI data)
[ 0.000000] BIOS-e820: 00000000cfe55c00 - 00000000d0000000 (reserved)
[ 0.000000] BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
[ 0.000000] BIOS-e820: 00000000fec00000 - 00000000fed00400 (reserved)
[ 0.000000] BIOS-e820: 00000000fed20000 - 00000000feda0000 (reserved)
[ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
[ 0.000000] BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
[ 0.000000] BIOS-e820: 0000000100000000 - 0000000128000000 (usable)

however, I've not been able to get very far with my attempts to manually construct an appropriate mtrr.