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To: vda@port.imtp.ilyichevsk.odessa.ua
Cc: andre@linux-ide.org, linux-kernel@vger.kernel.org
Subject: Re: 2.4.18 (and maybe earlier versions) can't see my IDE disks where 2.2 can
References: <871yao7erp.fsf@amaterasu.srvr.nix>
	<200207010657.g616voT17255@Port.imtp.ilyichevsk.odessa.ua>
X-Emacs: more boundary conditions than the Middle East.
From: Nix <nix@esperi.demon.co.uk>
Date: 01 Jul 2002 08:43:03 +0100
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On Mon, 1 Jul 2002, Denis Vlasenko said:
> On 30 June 2002 17:22, Nix wrote:
>> I'm using a ten year old 486 as a firewall, with an aged transparent
>> 2.5Mb Promise caching IDE controller managing a couple of fairly
>> bog-standard IDE disks (one a 420Mb 1989-vintage Western Digital of some
>> kind, the other a 1994-vintage 1Gb IBM disk). I can't find out the model
>> numbers without taking the machine to pieces, because even with 2.2.20
>> the (new) ide driver says
[snip --- probe fails to pick up any drives in 2.4, 2.2 says `non-IDE disk'
 but then works OK: if detection is forced with kernel parameters, 2.4 says
`hda6: bad access: block=2, count=2'... old hd.c driver works, but...]

> If 2.4 kernel does not work:
> Andre Hedrick <andre@linux-ide.org> [09 apr 2002]

[so copied: Andre, the earlier post is at
 <http://www.uwsg.iu.edu/hypermail/linux/kernel/0206.3/0679.html>.]

> Include lspci data and .config

lspci? On a 486 that's considerably older than the PCI spec itself? It's
ISA here, as far as the eye can see... as for ATA/ATAPI, forget it :)

One of the problems I'm having is that without PCI info, with a box
that's old enough that I can't easily tell what the hard drive models
actually *are*, it's hard to know where to start debugging :) I may have
to pull it apart and see if the drives have identifying labels on them.

I think that one of the problem spots may be that do_probe() spends most
of its time trying to fire ATA commands at the drive: I don't expect the
drives in *this* machine to make head or tail of that.

Anyway, I'm going to start a cautious forward merge of the 2.2 ide-probe
code into 2.4, and see when the behaviour changes. (Cautious and *slow*,
because this box is a firewall that has to be running most of the
time, so I'll have to sneak debugging in at odd hours. :( )

-- 
`What happened?'
                 `Nick shipped buggy code!'
                                             `Oh, no dinner for him...'
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