From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from thunker.thunk.org (THUNK.ORG [69.25.196.29]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTP id C6B8CDDF04 for ; Thu, 5 Apr 2007 03:42:42 +1000 (EST) Date: Wed, 4 Apr 2007 13:41:53 -0400 From: Theodore Tso To: "H. Peter Anvin" Subject: Re: [PATCH] Stop pmac_zilog from abusing 8250's device numbers. Message-ID: <20070404174153.GI31973@thunk.org> References: <1175663999.2932.8.camel@shinybook.infradead.org> <17939.15726.114059.679277@cargo.ozlabs.ibm.com> <1175666635.2932.17.camel@shinybook.infradead.org> <20070404.011208.120446173.davem@davemloft.net> <20070404083803.GA13134@flint.arm.linux.org.uk> <20070404122154.GF31973@thunk.org> <4613CF6A.2090407@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <4613CF6A.2090407@zytor.com> Cc: linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, paulus@samba.org, dwmw2@infradead.org, David Miller , alan@lxorguk.ukuu.org.uk List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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