From owner-freebsd-current@FreeBSD.ORG Wed May 12 12:49:09 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 024CA16A4CE for ; Wed, 12 May 2004 12:49:09 -0700 (PDT) Received: from mailout1.pacific.net.au (mailout1.pacific.net.au [61.8.0.84]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3C2C643D1F for ; Wed, 12 May 2004 12:49:08 -0700 (PDT) (envelope-from bde@zeta.org.au) Received: from mailproxy2.pacific.net.au (mailproxy2.pacific.net.au [61.8.0.87])i4CJmv4u028044; Thu, 13 May 2004 05:48:57 +1000 Received: from gamplex.bde.org (katana.zip.com.au [61.8.7.246]) i4CJmtHW001482; Thu, 13 May 2004 05:48:56 +1000 Date: Thu, 13 May 2004 05:48:55 +1000 (EST) From: Bruce Evans X-X-Sender: bde@gamplex.bde.org To: Roman Kurakin In-Reply-To: <40A26162.9030607@cronyx.ru> Message-ID: <20040513054339.E13728@gamplex.bde.org> References: <40A26162.9030607@cronyx.ru> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: freebsd-current@freebsd.org Subject: Re: Sio & Puc memory mapped X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 May 2004 19:49:09 -0000 On Wed, 12 May 2004, Roman Kurakin wrote: > Does any body workin on support for memory mapped serial adapters? > As I understand puc (4) allows to add support for such card, but sio (4) > cant > serve them any way. > If nobody doesn't, why so? If no one of developers bother, does anybody > wants this support? There is little need for it, because it is normal for pci 16550 cards to have i/o-mapped memory (possibly both memory-mapped and i/o mapped). I have uncommitted changed to use memory-mapped i/o for accessing the data registers only, since memory mapped i/o tends to be faster. Implementing memory-mapped i/o more generally is easier. Bruce