[Wylug-help] CD-ROM detects intermittently

[Gary Stainburn]

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.

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

--
Gary Stainburn

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