linux-kernel - Re: Promise PDC20376

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Message-ID: <30353c3d0812020536t2074842lf4f1a1ef469f914f@mail.gmail.com>
Date:	Tue, 2 Dec 2008 08:36:25 -0500
From:	"David Ellingsworth" <david@...ntd.dyndns.org>
To:	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Cc:	"Mikael Pettersson" <mikpe@...uu.se>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Promise PDC20376

On Tue, Dec 2, 2008 at 5:50 AM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
>> A small update to this. It seems the above mentioned interrupt fails
>> somewhere around the 128GB boundary. Interrupt 13h, AH=42 uses a 64
>> bit sector address and should be capable of addressing the entire
>> drive. For a SATA controller, this limitation seems relatively
>> arbitrary. For IDE controllers, a limitation such as this is
>> apparently common.
>
> 137GB I would imagine. That is the point at which LBA48 commands must be
> used not LBA28 and presumably their BIOS code only supports old format
> commands
>

Right, with LBA28 addressing you get 2^28 sector addresses = 2^27 KiB
= 2^17 MiB = 2^7 GiB = 128 GiB which is approximately 137GB. When I
wrote 128GB I really meant 128 GiB.

Regards,

David Ellingsworth

P.S. I hate the "new" binary size notations they only cause confusion.
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