Message-Id: <5.2.0.9.0.20030624084045.02918560@pop-server.san.rr.com>
Date: Tue, 24 Jun 2003 08:42:47 -0700
To: "H. Peter Anvin" <hpa@zytor.com>
From: John Coffman <johninsd@san.rr.com>
Subject: Re: Kernel & BIOS return differing head/sector geometries
Cc: Werner Almesberger <wa@almesberger.net>, linux-kernel@vger.kernel.org,
       John Coffman <johninsd@san.rr.com>
In-Reply-To: <3EF86E50.20504@zytor.com>
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 <bd8hgj$cas$1@cesium.transmeta.com>
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 <3EF7D33E.6060009@zytor.com>
 <20030624081319.G1326@almesberger.net>
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At 08:29 AM 06/24/2003, H. Peter Anvin wrote:
>Werner Almesberger wrote:
>>H. Peter Anvin wrote:
>>
>>>Presumably "linear", not "lba32".  I *presume* LILO has enough 
>>>wherewithal to use EBIOS if it's available and fall back to CBIOS 
>>>otherwise for at least one of these options.  I at least thought "lba32" 
>>>would force EBIOS usage.
>>
>>Yes, that seems to be the case. (All the LBA32 code is from John
>>Coffman. I've copied him in case he's interested in the thread.)
>>But you're still betting on the BIOS to either implement EDD
>>correctly, or at least to report that it doesn't support it.
>>Call me paranoid, but I wouldn't be at all surprised if there are
>>some BIOSes out there that get this wrong.
>
>Well... it's somewhat unlikely given the sheer amount of things that would 
>probably break.  The rule these days is that if it works with the 
>particular versin of M$ that's currently shipping then it's good, but I'm 
>pretty sure NTLOADER uses EDD.


Likewise GRUB.

Win 95 & 98 require EDD.

Win NT, 2000, and XP use it to boot (NTLDR).

--John


         PGP encrypted e-mail preferred (www.pgpi.com)
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