Linux not detecting ide0

Linux not detecting ide0

[David Balazic]

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 )


-- 
David Balazic
--------------
"Be excellent to each other." - Bill S. Preston, Esq., & "Ted" Theodore Logan
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Re: Linux not detecting ide0

[Vojtech Pavlik]

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