From: Brad Hards <bhards@bigpond.net.au>
To: Reg Clemens <reg@dwf.com>, linux-kernel@vger.kernel.org
Subject: Re: Dont understand hdc=ide-scsi behaviour.
Date: Fri, 20 Sep 2002 16:46:00 +1000
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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?

> I would EXPECT to get to them via /dev/hdd1 or /dev/hdd4.
And you will, with the right driver loaded :-)

> Did I miss something or is this a bug????
If you load ide-floppy before ide-scsi, and it still doesn't work, then there 
is a bug.

Brad
- -- 
http://conf.linux.org.au. 22-25Jan2003. Perth, Australia. Birds in Black.
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