linux-kernel - Re: [patch 2/2] 8250_pnp: register x86 COM ports at the conventional ttyS names

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Date:	Wed, 16 Jan 2008 15:42:08 -0500
From:	"H. Peter Anvin" <hpa@...or.com>
To:	7eggert@....de
CC:	Bjorn Helgaas <bjorn.helgaas@...com>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	Russell King <rmk+serial@....linux.org.uk>,
	Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [patch 2/2] 8250_pnp: register x86 COM ports at the conventional
 ttyS names

Bodo Eggert wrote:
> 
> BTW1: These addresses may be used to detect ports on non-standard addresses,
> but unfortunately they don't tell the IRQ.
> 
> BTW2: When I submitted a patch using the BIOS data area, I was told that it
> might not exist on systems booting from non-PC firmware. This claim was not
> yet backed with any knowledge, nor did anybody suggest a way to detect this
> situation.
> 

This is, of course, true.  It doesn't exactly help that some (most?) 
non-PC firmware at least mimic the BIOS data area.

In this particular case, there is some minor sanity-checking that can be 
done: the values should be nonzero and aligned 8.

	-hpa
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