linux-kernel - Re: How to get an IDE Hard Reset, not a Soft Reset?

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Date:	Mon, 11 Jun 2007 11:54:11 +0100
From:	Ralph Corderoy <ralph@...utplus.co.uk>
To:	Ondrej Zary <linux@...nbow-software.org>
Cc:	Ralph Corderoy <ralph@...utplus.co.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: How to get an IDE Hard Reset, not a Soft Reset? 


Hi Ondrej,

Ondrej Zary wrote:
> Ralph Corderoy wrote:
> > As I understand it, an IDE hard drive can be reset in three ways.  A
> > power-on reset, a hard reset caused by pin 1 (RESET-) on the IDE
> > connector, and a soft reset (bit SRST in the device control
> > register).  RESET- is held low on a power on, but can also be used
> > later to do a hard reset.
> 
> The RESET pin is often wired to the system RESET signal, so there is
> no way to control it separately.

Yes, I think you're correct.  I found a south bridge spec.,
http://www.tser.org/vt8231/vt8231.pdf, and I don't see a pin for driving
an IDE RESET-.

Oh well, I suppose I either dike out RESET- from the IDE cable and wire
it up to a serial or parallel port, or give up using a PC for the task
and use a dedicated circuit.

Thanks for your help.


Ralph.

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