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

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Date:	Tue, 15 May 2012 17:53:16 +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 03:52:06PM +0100, Alan Cox wrote:
> > It is easy to be confused since there are two EDD 3 specs. First is from
> > Phoenix BIOS (linked at the first mail of the thread) and it does not have
> > enough info even for ATA. You can't tell primary ATA controller from secondary.
> 
> Yes you can - it's defined by the PCI specification for compatibility
How? ATA device path has only Master/Slave. Interface path has only
bus/slot/function. So given all that in int13_80 how do I know if this
is primary or secondary controller?

T13 added has Channel number in Interface path.

> mappings on hardware of that era. Once you move to newer systems with ATA
> native PCI controllers then you need the 3.0 spec not the Phoenix spec.
> 
> Alan

--
			Gleb.
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