4Gb ram not showing up

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Hi everyone.
I am having some difficulty trying to get my 4Gb of ram recognized by the system. I have tried googling around to get some information on how to do this configuration, but I have come up dry. I suspect that the reason that there is not much info on how to set things up is because usually it just works. However, on my system I don't think it is.
By the way, I am not subscribed to this mailing list, so could you please CC me any replies.
The basics are that I have an Athlon 64 X2 Dual core, 4Gb ram, ASUS M2N-MX motherboard. The bios has a configuration item for MTRR mapping, with options for CONTINUOUS and DISCRETE. I have selected CONTINUOUS, which explicitly describes the PCI hole as non-cacheable. The other option leaves the PCI hole undescribed. 

My config has selected
CONFIG_HIGHMEM4G=y

free -m reports the following....
            total       used       free     shared    buffers     cached
Mem:          2906       2794        112          0        275         31
-/+ buffers/cache:       2487        419
Swap:         4996        366       4630


/proc/mtrr contains the following....

reg00: base=0x00000000 (   0MB), size=4096MB: write-back, count=1
reg01: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
reg02: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1


Relevant bootup messages include these....
Jun 3 13:50:52 fawkes Linux version 2.6.20-gentoo-r8 (root@fawkes) (gcc version 4.1.1 (Gentoo 4.1.1-r3)) #6 SMP Tue May 15 10:18:59 EDT 2007 
Jun  3 13:50:52 fawkes BIOS-provided physical RAM map:
Jun  3 13:50:52 fawkes sanitize start
Jun  3 13:50:52 fawkes sanitize end
Jun 3 13:50:52 fawkes copy_e820_map() start: 0000000000000000 size: 000000000009fc00 end: 000000000009fc00 type: 1 
Jun  3 13:50:52 fawkes copy_e820_map() type is E820_RAM
Jun 3 13:50:52 fawkes copy_e820_map() start: 000000000009fc00 size: 0000000000000400 end: 00000000000a0000 type: 2 Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000000e0000 size: 0000000000020000 end: 0000000000100000 type: 2 Jun 3 13:50:52 fawkes copy_e820_map() start: 0000000000100000 size: 00000000b7ec0000 end: 00000000b7fc0000 type: 1 
Jun  3 13:50:52 fawkes copy_e820_map() type is E820_RAM
Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000b7fc0000 size: 000000000000e000 end: 00000000b7fce000 type: 3 Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000b7fce000 size: 0000000000022000 end: 00000000b7ff0000 type: 4 Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000b7ff0000 size: 0000000000010000 end: 00000000b8000000 type: 2 Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000fec00000 size: 0000000000001000 end: 00000000fec01000 type: 2 Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000fee00000 size: 0000000000100000 end: 00000000fef00000 type: 2 Jun 3 13:50:52 fawkes copy_e820_map() start: 00000000ff780000 size: 0000000000880000 end: 0000000100000000 type: 2 Jun 3 13:50:52 fawkes copy_e820_map() start: 0000000100000000 size: 0000000040000000 end: 0000000140000000 type: 1 
Jun  3 13:50:52 fawkes copy_e820_map() type is E820_RAM
Jun 3 13:50:52 fawkes BIOS-e820: 0000000000000000 - 000000000009fc00 (usable) Jun 3 13:50:52 fawkes BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved) Jun 3 13:50:52 fawkes BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) Jun 3 13:50:52 fawkes BIOS-e820: 0000000000100000 - 00000000b7fc0000 (usable) Jun 3 13:50:52 fawkes BIOS-e820: 00000000b7fc0000 - 00000000b7fce000 (ACPI data) Jun 3 13:50:52 fawkes BIOS-e820: 00000000b7fce000 - 00000000b7ff0000 (ACPI NVS) Jun 3 13:50:52 fawkes BIOS-e820: 00000000b7ff0000 - 00000000b8000000 (reserved) Jun 3 13:50:52 fawkes BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved) Jun 3 13:50:52 fawkes BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved) Jun 3 13:50:52 fawkes BIOS-e820: 00000000ff780000 - 0000000100000000 (reserved) Jun 3 13:50:52 fawkes BIOS-e820: 0000000100000000 - 0000000140000000 (usable) 
Jun  3 13:50:52 fawkes Warning only 4GB will be used.
Jun  3 13:50:52 fawkes Use a PAE enabled kernel.
Jun  3 13:50:52 fawkes 3200MB HIGHMEM available.
Jun  3 13:50:52 fawkes 896MB LOWMEM available.
Jun  3 13:50:52 fawkes found SMP MP-table at 000ff780
Jun 3 13:50:52 fawkes Entering add_active_range(0, 0, 1048576) 0 entries of 256 used 
Jun  3 13:50:52 fawkes Zone PFN ranges:
Jun  3 13:50:52 fawkes DMA             0 ->     4096
Jun  3 13:50:52 fawkes Normal       4096 ->   229376
Jun  3 13:50:52 fawkes HighMem    229376 ->  1048576
Jun  3 13:50:52 fawkes early_node_map[1] active PFN ranges
Jun  3 13:50:52 fawkes 0:        0 ->  1048576
Jun  3 13:50:52 fawkes On node 0 totalpages: 1048576
Jun  3 13:50:52 fawkes DMA zone: 32 pages used for memmap
Jun  3 13:50:52 fawkes DMA zone: 0 pages reserved
Jun  3 13:50:52 fawkes DMA zone: 4064 pages, LIFO batch:0
Jun  3 13:50:52 fawkes Normal zone: 1760 pages used for memmap
Jun  3 13:50:52 fawkes Normal zone: 223520 pages, LIFO batch:31
Jun  3 13:50:52 fawkes HighMem zone: 6400 pages used for memmap
Jun  3 13:50:52 fawkes HighMem zone: 812800 pages, LIFO batch:31
Jun  3 13:50:52 fawkes DMI 2.3 present.
Jun  3 13:50:52 fawkes Using APIC driver default
Jun 3 13:50:52 fawkes ACPI: RSDP (v002 ACPIAM ) @ 0x000fbab0 Jun 3 13:50:52 fawkes ACPI: XSDT (v001 A M I OEMXSDT 0x09000606 MSFT 0x00000097) @ 0xb7fc0100 Jun 3 13:50:52 fawkes ACPI: FADT (v003 A M I OEMFACP 0x09000606 MSFT 0x00000097) @ 0xb7fc0290 Jun 3 13:50:52 fawkes ACPI: MADT (v001 A M I OEMAPIC 0x09000606 MSFT 0x00000097) @ 0xb7fc0390 Jun 3 13:50:52 fawkes ACPI: MCFG (v001 A M I OEMMCFG 0x09000606 MSFT 0x00000097) @ 0xb7fc0400 Jun 3 13:50:52 fawkes ACPI: OEMB (v001 A M I AMI_OEM 0x09000606 MSFT 0x00000097) @ 0xb7fce040 Jun 3 13:50:52 fawkes ACPI: SSDT (v001 A M I POWERNOW 0x00000001 AMD 0x00000001) @ 0xb7fc5300 Jun 3 13:50:52 fawkes ACPI: DSDT (v001 A0557 A0557000 0x00000000 INTL 0x02002026) @ 0x00000000 
Jun  3 13:50:52 fawkes Nvidia board detected. Ignoring ACPI timer override.
Jun  3 13:50:52 fawkes If you got timer trouble try acpi_use_timer_override
Jun  3 13:50:52 fawkes Nvidia board detected. Ignoring ACPI timer override.
Jun  3 13:50:52 fawkes If you got timer trouble try acpi_use_timer_override
Jun  3 13:50:52 fawkes Nvidia board detected. Ignoring ACPI timer override.
Jun  3 13:50:52 fawkes If you got timer trouble try acpi_use_timer_override
Jun  3 13:50:52 fawkes Nvidia board detected. Ignoring ACPI timer override.
Jun  3 13:50:52 fawkes If you got timer trouble try acpi_use_timer_override
Jun  3 13:50:52 fawkes ACPI: PM-Timer IO Port: 0x508
Jun  3 13:50:52 fawkes ACPI: Local APIC address 0xfee00000
Jun  3 13:50:52 fawkes ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
Jun  3 13:50:52 fawkes Processor #0 15:11 APIC version 16
Jun  3 13:50:52 fawkes ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
Jun  3 13:50:52 fawkes Processor #1 15:11 APIC version 16
Jun 3 13:50:52 fawkes ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0]) Jun 3 13:50:52 fawkes IOAPIC[0]: apic_id 2, version 17, address 0xfec00000, GSI 0-23 Jun 3 13:50:52 fawkes ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 0 dfl dfl) Jun 3 13:50:52 fawkes ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level) Jun 3 13:50:52 fawkes ACPI: INT_SRC_OVR (bus 0 bus_irq 14 global_irq 14 high edge) Jun 3 13:50:52 fawkes ACPI: INT_SRC_OVR (bus 0 bus_irq 15 global_irq 15 high edge) 
Jun  3 13:50:52 fawkes ACPI: IRQ0 used by override.
Jun  3 13:50:52 fawkes ACPI: IRQ9 used by override.
Jun  3 13:50:52 fawkes ACPI: IRQ14 used by override.
Jun  3 13:50:52 fawkes ACPI: IRQ15 used by override.
Jun  3 13:50:52 fawkes Enabling APIC mode:  Flat.  Using 1 I/O APICs
Jun  3 13:50:52 fawkes Using ACPI (MADT) for SMP configuration information
Jun 3 13:50:52 fawkes Allocating PCI resources starting at c0000000 (gap: b8000000:46c00000) 
Jun  3 13:50:52 fawkes Detected 2009.188 MHz processor.
Jun  3 13:50:52 fawkes Built 1 zonelists.  Total pages: 1040384
Jun  3 13:50:52 fawkes Kernel command line: root=/dev/sda2
Jun  3 13:50:52 fawkes mapped APIC to ffffd000 (fee00000)
Jun  3 13:50:52 fawkes mapped IOAPIC to ffffc000 (fec00000)
Jun  3 13:50:52 fawkes Enabling fast FPU save and restore... done.
Jun  3 13:50:52 fawkes Enabling unmasked SIMD FPU exception support... done.
Jun  3 13:50:52 fawkes Initializing CPU#0
Jun  3 13:50:52 fawkes PID hash table entries: 4096 (order: 12, 16384 bytes)
Jun  3 13:50:52 fawkes spurious 8259A interrupt: IRQ7.
Jun  3 13:50:52 fawkes Console: colour VGA+ 80x25
Jun 3 13:50:52 fawkes Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) Jun 3 13:50:52 fawkes Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) Jun 3 13:50:52 fawkes Memory: 2975372k/4194304k available (2686k kernel code, 37964k reserved, 935k data, 272k init, 2096896k highmem) 
Jun  3 13:50:52 fawkes virtual kernel memory layout:
Jun  3 13:50:52 fawkes fixmap  : 0xfff9c000 - 0xfffff000   ( 396 kB)
Jun  3 13:50:52 fawkes pkmap   : 0xff800000 - 0xffc00000   (4096 kB)
Jun  3 13:50:52 fawkes vmalloc : 0xf8800000 - 0xff7fe000   ( 111 MB)
Jun  3 13:50:52 fawkes lowmem  : 0xc0000000 - 0xf8000000   ( 896 MB)
Jun  3 13:50:52 fawkes .init : 0xc0491000 - 0xc04d5000   ( 272 kB)
Jun  3 13:50:52 fawkes .data : 0xc039fa7d - 0xc0489a18   ( 935 kB)
Jun  3 13:50:52 fawkes .text : 0xc0100000 - 0xc039fa7d   (2686 kB)

Any suggestions as to what I can try to get all 4Gb of ram to show up?

Thanks,

Tom

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