Message-ID: <478E5FD8.5060906@zytor.com>
Date: Wed, 16 Jan 2008 14:49:44 -0500
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Bjorn Helgaas <bjorn.helgaas@hp.com>
CC: Alan Cox <alan@lxorguk.ukuu.org.uk>, linux-kernel@vger.kernel.org,
       linux-serial@vger.kernel.org,
       Russell King <rmk+serial@arm.linux.org.uk>,
       Jeff Garzik <jeff@garzik.org>,
       Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [patch 2/2] 8250_pnp: register x86 COM ports at the conventional
 ttyS names
References: <20080116170541.511233227@ldl.fc.hp.com> <20080116170914.959390017@ldl.fc.hp.com> <478E5095.2020803@zytor.com> <200801161247.34821.bjorn.helgaas@hp.com>
In-Reply-To: <200801161247.34821.bjorn.helgaas@hp.com>
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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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