This could be because the mother board does not support double sided memory
!
Thus is only seeing one side of the second module.
Also some older motherboards are not designed to use a mix.
Again SOME motherboards.
It is a compatibility issue.
I have a soyo board that does this.
So you may want to swap the 256 for a single sided module.
Thanks.
Bill Preece
----- Original Message -----
From: <btt@nethouse.com>
To: <slug@lists.nks.net>
Sent: Sunday, May 04, 2003 6:43 PM
Subject: [SLUG] Memory unaccounted for?
> Hi,
>
> I have this intel system, it is one of those 'bare-bones' systems,
> about 3 years old. When I got it, it had 128MB of PC-100 memory in it,
> which is great, but I wanted a little more so I added a 256MB PC-100
> chip a while back.
>
> The strange thing is that the bios is only reporting 256MB when both
> chips are present, and 128MB when only the 128MB is present. It does
> this at the self-test on startup.
>
> I ran memtest for one complete pass and got no errors, nor am I
> experiencing any strangeness during normal operations. Only the
> missing 128MB when both chips are present.
>
> Any idea why that's happening? Could one be a different speed than the
> other, so as to cause some imcompatibility?
>
> Thanks in advance,
> bill
>
> Here's a dmesg. sorry if it gets all munged up.
>
> Linux version 2.4.20-gentoo-r1 (root@piii) (gcc version 3.2.2) #3 Sun Mar
2 16:08:08 EST 2003
> BIOS-provided physical RAM map:
> BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
> BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
> BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
> BIOS-e820: 0000000000100000 - 000000000fef0000 (usable)
> BIOS-e820: 000000000fef0000 - 000000000fef3000 (ACPI NVS)
> BIOS-e820: 000000000fef3000 - 000000000ff00000 (ACPI data)
> BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
> 254MB LOWMEM available.
> On node 0 totalpages: 65264
> zone(0): 4096 pages.
> zone(1): 61168 pages.
> zone(2): 0 pages.
> Kernel command line: root=/dev/hda6
> Initializing CPU#0
> Detected 634.870 MHz processor.
> Console: colour VGA+ 80x25
> Calibrating delay loop... 1253.37 BogoMIPS
> Memory: 252944k/261056k available (1582k kernel code, 5688k reserved, 482k
data, 88k init, 0k highmem)
> Dentry cache hash table entries: 32768 (order: 6, 262144 bytes)
> Inode cache hash table entries: 16384 (order: 5, 131072 bytes)
> Mount-cache hash table entries: 4096 (order: 3, 32768 bytes)
> Buffer-cache hash table entries: 16384 (order: 4, 65536 bytes)
> Page-cache hash table entries: 65536 (order: 6, 262144 bytes)
> Proc Config support by ptb@it.uc3m.es
> proc config counted 1684 bytes in names
> proc config counted 195 bytes in value handles
> CPU: L1 I cache: 16K, L1 D cache: 16K
> CPU: L2 cache: 128K
> Intel machine check architecture supported.
> Intel machine check reporting enabled on CPU#0.
> CPU: After generic, caps: 0383f9ff 00000000 00000000 00000000
> CPU: Common caps: 0383f9ff 00000000 00000000 00000000
> CPU: Intel Celeron (Coppermine) stepping 03
> Enabling fast FPU save and restore... done.
> Enabling unmasked SIMD FPU exception support... done.
> Checking 'hlt' instruction... OK.
> POSIX conformance testing by UNIFIX
> mtrr: v1.40 (20010327) Richard Gooch (rgooch@atnf.csiro.au)
> mtrr: detected mtrr type: Intel
> PCI: PCI BIOS revision 2.10 entry at 0xfb210, last bus=1
> PCI: Using configuration type 1
> PCI: Probing PCI hardware
> PCI: Probing PCI hardware (bus 00)
> Transparent bridge - Intel Corp. 82801AA PCI Bridge
> PCI: Using IRQ router PIIX [8086/2410] at 00:1f.0
> Linux NET4.0 for Linux 2.4
> Based upon Swansea University Computer Society NET3.039
> Initializing RT netlink socket
> Starting kswapd
> Journalled Block Device driver loaded
> devfs: v1.12c (20020818) Richard Gooch (rgooch@atnf.csiro.au)
> devfs: boot_options: 0x1
> pty: 256 Unix98 ptys configured
> Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ
SERIAL_PCI enabled
> ttyS00 at 0x03f8 (irq = 4) is a 16550A
> ttyS01 at 0x02f8 (irq = 3) is a 16550A
> PCI: Found IRQ 5 for device 00:1f.6
> PCI: Sharing IRQ 5 with 00:1f.5
> Uniform Multi-Platform E-IDE driver Revision: 6.31
> ide: Assuming 33MHz system bus speed for PIO modes; override with
idebus=xx
> ICH: IDE controller on PCI bus 00 dev f9
> ICH: chipset revision 2
> ICH: not 100% native mode: will probe irqs later
> ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:pio
> ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:DMA, hdd:pio
> hda: SAMSUNG SV2044D, ATA DISK drive
> hdc: ATAPI CDROM, ATAPI CD/DVD-ROM drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> ide1 at 0x170-0x177,0x376 on irq 15
> blk: queue c0342ea4, I/O limit 4095Mb (mask 0xffffffff)
> hda: 39862368 sectors (20410 MB) w/472KiB Cache, CHS=39546/16/63, UDMA(66)
> hdc: ATAPI CD-ROM drive, 128kB Cache, UDMA(33)
> Uniform CD-ROM driver Revision: 3.12
> Partition check:
> /dev/ide/host0/bus0/target0/lun0: p1 p2 < p5 p6 >
> Floppy drive(s): fd0 is 1.44M
> FDC 0 is a post-1991 82077
> Linux Tulip driver version 0.9.15-pre12 (Aug 9, 2002)
> tulip0: MII transceiver #1 config 3000 status 7829 advertising 01e1.
> eth0: Lite-On 82c168 PNIC rev 32 at 0xc000, 00:A0:CC:60:FA:36, IRQ 11.
> usb.c: registered new driver hub
> uhci.c: USB Universal Host Controller Interface driver v1.1
> PCI: Found IRQ 9 for device 00:1f.2
> PCI: Setting latency timer of device 00:1f.2 to 64
> uhci.c: USB UHCI at I/O 0xd000, IRQ 9
> usb.c: new USB bus registered, assigned bus number 1
> hub.c: USB hub found
> hub.c: 2 ports detected
> usb.c: registered new driver hiddev
> usb.c: registered new driver hid
> hid-core.c: v1.8.1 Andreas Gal, Vojtech Pavlik <vojtech@suse.cz>
> hid-core.c: USB HID support drivers
> mice: PS/2 mouse device common for all mice
> NET4: Linux TCP/IP 1.0 for NET4.0
> IP Protocols: ICMP, UDP, TCP, IGMP
> IP: routing cache hash table of 2048 buckets, 16Kbytes
> TCP: Hash tables configured (established 16384 bind 32768)
> NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
> kjournald starting. Commit interval 5 seconds
> EXT3-fs: mounted filesystem with ordered data mode.
> VFS: Mounted root (ext3 filesystem) readonly.
> Mounted devfs on /dev
> Freeing unused kernel memory: 88k freed
> Adding Swap: 499928k swap-space (priority -1)
> EXT3 FS 2.4-0.9.19, 19 August 2002 on ide0(3,6), internal journal
> eth0: Setting full-duplex based on MII#1 link partner capability of 45e1.
> Intel 810 + AC97 Audio, version 0.21, 10:29:49 Mar 2 2003
> PCI: Found IRQ 5 for device 00:1f.5
> PCI: Sharing IRQ 5 with 00:1f.6
> PCI: Setting latency timer of device 00:1f.5 to 64
> i810: Intel ICH 82801AA found at IO 0xdc00 and 0xd800, IRQ 5
> i810_audio: Audio Controller supports 2 channels.
> ac97_codec: AC97 Audio codec, id: ADS64(Analog Devices AD1881)
> i810_audio: AC'97 codec 0 Unable to map surround DAC's (or DAC's not
present), total channels = 2
> ac97_codec: AC97 Modem codec, id: SIL34(Silicon Laboratory Si3036)
> i810_audio: timed out waiting for codec 1 analog ready.
> i810_audio: setting clocking to 48648
> NET4: AppleTalk 0.18a for Linux NET4.0
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