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Date: Fri, 20 Sep 2002 20:44:38 +0200
From: Paul Bristow <paul@paulbristow.net>
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To: Miles Lane <miles.lane@attbi.com>
CC: Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Dont understand hdc=ide-scsi behaviour.
References: <200209192108.g8JL8iT6010419@orion.dwf.com>	 <200209201646.00202.bhards@bigpond.net.au> <1032533179.4526.102.camel@firehose.megapathdsl.net>
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Use the line
    hdc=ide-scsi hdd=ide-floppy

and all should be well, even if using ide-floppy as a module

Miles Lane wrote:

>On Thu, 2002-09-19 at 23:46, Brad Hards wrote:
>  
>
>>-----BEGIN PGP SIGNED MESSAGE-----
>>Hash: SHA1
>>
>>On Fri, 20 Sep 2002 07:08, Reg Clemens wrote:
>>    
>>
>>>I dont understand the behaviour of kernel 2.4.18 (and probably all others)
>>>when I put the line
>>>		hdc=ide-scsi
>>>on the load line.
>>>
>>>I would EXPECT to get the ide-scsi driver for hdc (my cdwriter) but instead
>>>get it for BOTH hdc and hdd, the cdwriter and the zip drive.
>>>
>>>After starting this way (with hdc=ide-scsi), I find that
>>>	/dev/cdrom2 -> /dev/scd0
>>>and that to access the zip drive I have to use /dev/sda1 (or /dev/sda4)
>>>      
>>>
>>There are two slightly different things happening, I think.
>>
>>1. When you say hdc=ide-scsi, you are telling the IDE system that you don't 
>>want to use the normal IDE interfaces to userland (such as ide-cdrom), but 
>>instead want all access to this device to be accessed through the SCSI 
>>midlayer (and associated SCSI interfaces, like the sg and scd drivers). So 
>>ide-scsi becomes the driver, instead of ide-cdrom. You should be able to see 
>>this in /proc/ide/hdc/driver
>>
>>2. ide-scsi is greedy, and will grab any IDE device without a driver. ATAPI 
>>floppy devices (hopefully) like your zip drive need the IDE floppy device 
>>driver, which is probably not loaded. What does CONFIG_BLK_DEV_IDEFLOPPY 
>>equal in your kernel config?
>>    
>>
-- 

Paul

Email:	paul@paulbristow.net
Web:	http://paulbristow.net
ICQ:	11965223


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