Bug#689768:
If that helps:
$ cat /proc/mtrr
reg00: base=0x000000000 ( 0MB), size= 8192MB, count=1: write-back
reg01: base=0x0bb800000 ( 3000MB), size= 8MB, count=1: uncachable
reg02: base=0x0bc000000 ( 3008MB), size= 64MB, count=1: uncachable
reg03: base=0x0c0000000 ( 3072MB), size= 1024MB, count=1: uncachable
reg04: base=0x1bfe00000 ( 7166MB), size= 2MB, count=1: uncachable
reg05: base=0x1c0000000 ( 7168MB), size= 1024MB, count=1: uncachable
$ cat /proc/iomem
00000000-0000ffff : reserved
00010000-0009bfff : System RAM
0009c000-0009ffff : reserved
000a0000-000bffff : PCI Bus 0000:00
000c0000-000dffff : PCI Bus 0000:00
000c0000-000cd9ff : Video ROM
000e0000-000fffff : reserved
000f0000-000fffff : System ROM
00100000-1fffffff : System RAM
01000000-01354585 : Kernel code
01354586-0169367f : Kernel data
01727000-01805fff : Kernel bss
20000000-201fffff : reserved
20200000-3fffffff : System RAM
40000000-401fffff : reserved
40200000-bad88fff : System RAM
bad89000-badd1fff : ACPI Non-volatile Storage
badd2000-badd9fff : ACPI Tables
badda000-badfdfff : reserved
badfe000-badfefff : System RAM
badff000-bae0efff : reserved
bae0f000-bae1cfff : ACPI Non-volatile Storage
bae1d000-bae40fff : reserved
bae41000-bae83fff : ACPI Non-volatile Storage
bae84000-baffffff : System RAM
bb000000-bb7fffff : RAM buffer
bb800000-bf9fffff : reserved
bfa00000-ffffffff : PCI Bus 0000:00
c0000000-cfffffff : 0000:00:02.0
d0000000-d00fffff : PCI Bus 0000:03
d0000000-d0003fff : 0000:03:00.0
d0000000-d0003fff : r8169
d0004000-d0004fff : 0000:03:00.0
d0004000-d0004fff : r8169
e0000000-efffffff : PCI MMCONFIG 0000 [bus 00-ff]
e0000000-efffffff : pnp 00:01
fe000000-fe3fffff : 0000:00:02.0
fe400000-fe4fffff : PCI Bus 0000:02
fe400000-fe40ffff : 0000:02:00.0
fe400000-fe40ffff : ath9k
fe500000-fe503fff : 0000:00:1b.0
fe500000-fe503fff : ICH HD audio
fe504000-fe5040ff : 0000:00:1f.3
fe505000-fe5053ff : 0000:00:1d.0
fe505000-fe5053ff : ehci_hcd
fe506000-fe5063ff : 0000:00:1a.0
fe506000-fe5063ff : ehci_hcd
fe507000-fe50700f : 0000:00:16.0
fec00000-fec003ff : IOAPIC 0
fed00000-fed003ff : HPET 0
fed08000-fed08fff : pnp 00:08
fed10000-fed19fff : pnp 00:01
fed1c000-fed1ffff : reserved
fed1c000-fed1ffff : pnp 00:08
fed20000-fed3ffff : pnp 00:01
fed90000-fed93fff : pnp 00:01
fee00000-fee0ffff : pnp 00:01
fee00000-fee00fff : Local APIC
ff000000-ffffffff : reserved
ff000000-ffffffff : pnp 00:08
100000000-1bfdfffff : System RAM
1bfe00000-1bfffffff : RAM buffer
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