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 14:49:44 -0500
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, 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>
Subject: Re: [patch 2/2] 8250_pnp: register x86 COM ports at the conventional
 ttyS names

Bjorn Helgaas wrote:
>>> +
>> Arguably, the right thing is to use the addresses present in the array 
>> at address 0x400.  In particular, COM3 and COM4 aren't always at those 
>> addresses.
> 
> Wow.  I bow before your storehouse of x86 arcana :-)
> 
> I guess you're referring to the "BIOS data area," which I'd never
> heard of before (but fortunately, Google knows).
> 
> What would you think about doing this only for COM1 and COM2?  The
> only real value for doing this in the first place is so "console=ttyS0"
> always goes to COM1, even if we don't have SERIAL_PORT_DFNS.  User-
> space ought to use some sort of udev magic if it cares about persistent
> naming.
> 

Well, there are four ports that the BIOS have slots for, and if so, we 
probably should use them.

	-hpa
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