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    SubjectRe: Linux not detecting ide0
    On Thu, Sep 20, 2001 at 08:19:43PM +0200, David Balazic wrote:
    > I discovered some weird behavior in IDE interface handling.
    > I some cases linux detects the ide1 channel , but not ide0.
    > More precisely , it prints a line like :
    >
    > ide0: BM-DMA xxxxxx
    >
    > but that is it. Nothing else. No line of :
    >
    > ide0: at 0x0170 blah blah
    >
    > no drives on the channel are recognized.
    > No ide0 entry in /proc/devices
    > etc.
    >
    > ide1 and the devices on it are more or less OK. ( I didn't notice
    > any problems, but it is hard to test if linux does not see the root
    > fs on hda ! )
    >
    > I tested the redhat kernel-2.4.7-10 and vanilla linux 2.4.9.
    >
    > Hardware details :
    > - MSI K7T Pro2A motherboard , BIOS v2.9 , VIA KT133 chipset, via 686b southbridge
    > - hda is an IBM Deskstar 75GXP 45 GB hard drive ( DTLA-307045 ) ( 80-wire cable,
    > cable-select , connected to the end of the cable, thus master )
    > - hdb : none
    > - hdc : Acer 1208A CD-RW drive ( cable select (master))
    > - hdd : Teac CD532E-B CD-ROM ( cable select (slave)) 80-wire cable
    >
    > The way to trigger this is to set one of the IDE devices in BIOS to wrong geometry.
    > Maybe it is a BIOS bug.
    >
    > I some cases I also got a weird line from linux :
    > hd1: C/H/S=0/0/0 from BIOS ignored
    >
    > I thought that disk are enumerated by letter only, not numbers.
    > ( it is H-D-one , not H-D-ell, in case you have a funny font )

    Have you by any chance set "Use old disk-only driver on primary
    interface" to yes? That would explain things ...

    --
    Vojtech Pavlik
    SuSE Labs
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