linux-kernel - Re: [RFC 1/5] platform-drivers-x86: add support for Technologic Systems TS-5xxx detection

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Message-ID: <20110504162954.7ecf5b5e@lxorguk.ukuu.org.uk>
Date:	Wed, 4 May 2011 16:29:54 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Jonas Fonseca <jonas.fonseca@...oirfairelinux.com>,
	platform-driver-x86 <platform-driver-x86@...r.kernel.org>,
	linux-serial <linux-serial@...r.kernel.org>,
	lm-sensors <lm-sensors@...sensors.org>
Subject: Re: [RFC 1/5] platform-drivers-x86: add support for Technologic
 Systems TS-5xxx detection

> It is possible to make a BIOS call (Int 15h / Function B000h) to get
> board information, like the manufacturer ("TS"). It should be a safer
> way to check if we are on a Technologic Systems board. a intcall(0x15,
> &ireg, &oreg) should do the trick to check the platform, before checking
> the SBC ID. What do you think?

And that goes to 'How you do yo know it's safe to call INT 15 0xB000 -
especially as we are in 32bit mode and the BIOS is 16bit so you have to
call it very early meaning its a great way to make something else not
boot.

Does the board not support anything sane like DMI ?

Alan
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