[Wylug-help] CD-ROM detects intermittently

[James Holden]

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Gary Stainburn wrote:
| Hi James
|
| First the down side.  When I had this, it was the IDE ctrl going T-U.
  I ended
| up replacing the board.  However, this doesn't sound like a HW problem.
|
| I've no real suggestion except the obvious.  Invest £2 on a second
cable and
| split the CDRom onto the second IDE.  It looks like there's possibly a
| problem initing the first IDE, maybe setting a mode that is
incompatible with
| the CDROM drive.

Oh..... I forgot to mention it's a laptop! (Sorry)

James


| Gary
|
| On Wednesday 01 Sep 2004 1:07 pm, James Holden wrote:
|
|>All,
|>
|>A friend of mine is having weird problems with his IDE CD-ROM not
|>detecting on bootup on Mandrake 10.
|>
|>Sometime's it's detected, and other times it's not.
|>
|>When it isn't detected, the light on the drive comes on and stays on.
|>When it is, it flickers then stays off and the drive works OK.
|>
|>The machine dual boots Windows 98 and the drive detected every time
|>under that.
|>
|>The machine's a laptop, and the hard disk is hda and the CD-ROM is hdb
|>(ugh!).
|>
|>He's mailed me the outputs of dmesg when it detects and when it doesn't,
|>and frankly the only difference is one line:
|>
|>When it's not there:
|>Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
|>ide: Assuming 33MHz system bus speed for PIO modes; override with
idebus=xx
|>PIIX4: IDE controller at PCI slot 0000:00:07.1
|>PIIX4: chipset revision 0
|>PIIX4: not 100% native mode: will probe irqs later
|>~    ide0: BM-DMA at 0x1400-0x1407, BIOS settings: hda:DMA, hdb:DMA
|>hda: FUJITSU MHM2200AT, ATA DISK drive
|>Using anticipatory io scheduler
|>ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
|>hda: max request size: 128KiB
|>hda: 39070080 sectors (20003 MB) w/2048KiB Cache, CHS=38760/16/63,
UDMA(33)
|>~ /dev/ide/host0/bus0/target0/lun0: p1 p2 < p5 p6 p7 >
|>
|>When it is there:
|>Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
|>ide: Assuming 33MHz system bus speed for PIO modes; override with
idebus=xx
|>PIIX4: IDE controller at PCI slot 0000:00:07.1
|>PIIX4: chipset revision 0
|>PIIX4: not 100% native mode: will probe irqs later
|>~    ide0: BM-DMA at 0x1400-0x1407, BIOS settings: hda:DMA, hdb:DMA
|>hda: FUJITSU MHM2200AT, ATA DISK drive
|>hdb: CD-224E, ATAPI CD/DVD-ROM drive       <-----CD-ROM detected
|>Using anticipatory io scheduler
|>ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
|>hda: max request size: 128KiB
|>hda: 39070080 sectors (20003 MB) w/2048KiB Cache, CHS=38760/16/63,
UDMA(33)
|>~ /dev/ide/host0/bus0/target0/lun0: p1 p2 < p5 p6 p7 >
|>
|>I'm wondering if it's some odd race condition caused by the CD-ROM
|>remaining busy after the BIOS attempts to boot from it.
|>
|>Is there any IDE kernel parameters to force an extra IDE reset, or delay
|>IDE initialisation?
|>
|>I'm stumped on this one. There's no aparrent pattern to it.
|>
|>
|>Any thoughts or similar experiences?
|>
|>James
|
|


- --
James Andrew Holden, Leeds, UK    (james at jamesholden dot net)
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