linux-kernel - Re: [PATCH] Stop pmac_zilog from abusing 8250's device numbers.

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Date:	Wed, 4 Apr 2007 13:41:53 -0400
From:	Theodore Tso <tytso@....edu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	David Miller <davem@...emloft.net>, dwmw2@...radead.org,
	paulus@...ba.org, alan@...rguk.ukuu.org.uk, flar@...andria.com,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Stop pmac_zilog from abusing 8250's device numbers.

On Wed, Apr 04, 2007 at 09:16:42AM -0700, H. Peter Anvin wrote:
> One option would be to move the 8250-based serial ports, to, say, 
> /dev/ttyN* (for National Semiconductors -- the best I could come up 
> with) and redefine /dev/ttyS* as a serial port multiplexer which maps in 
> all the types, for the ones that really want dynamic mapping.

> Of course, now you have the potential of aliasing, again, which tends to 
> cause all kinds of headaches w.r.t. locking.  

That would break the 99.9% of the the world using Intel-based systems
which only have 8250's, for very little gain. 

Like it or not, /dev/ttySx and 8250 UART's are to serial ports what
the PCI is to system buses....

						- Ted
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