linux-kernel - Re: [PATCH] EDD: Check for correct EDD 3.0 length

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Message-ID: <20120515155303.GJ6948@redhat.com>
Date:	Tue, 15 May 2012 18:53:03 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Hannes Reinecke <hare@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [PATCH] EDD: Check for correct EDD 3.0 length

On Tue, May 15, 2012 at 04:41:43PM +0100, Alan Cox wrote:
> > Hmm, will work if standard I/O addresses are used for master/slave, but
> > I do not see this information be exposed via /sys by EDD. So how can I
> > do it from OS installer with current kernel or kernel with reverted
> > patch?
> 
> I don't think we provide the needed info for this (or EDD 2.1 which I've
> just discovered actually shipped in some plug in boards). Not sure 2.1 is
> around online anywhere.
> 
> Thats a separate problem though.
> 
It is not. You are saying that the code we have now supported Phoenix
spec and now it is not. This is not the case though.

> My big concern is that we are sure it disappearing won't break anything.
> It's been noticed at SuSE so it's obviously not entiely invisible.
So lets ask Hannes what problem he tries to fix by the patch.

> 
> I'd love to see EDD 1.1 and 2.1 support in the kernel as I could then
> merge pata_hdd which drives original MFM/RLL drives. However I don't
> believe its worth the effort unlike doing 3.0 right.
> 
It is OK to add Phoenix support to the code. To do that code needs to
figure what spec BIOS uses and parse the data differently, not just blindly
misinterpret binary buffer.

--
			Gleb.
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