From owner-freebsd-hackers@FreeBSD.ORG Sun Feb 4 20:24:03 2007 Return-Path: X-Original-To: freebsd-hackers@FreeBSD.ORG Delivered-To: freebsd-hackers@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 96FB516A405 for ; Sun, 4 Feb 2007 20:24:03 +0000 (UTC) (envelope-from imp@bsdimp.com) Received: from harmony.bsdimp.com (vc4-2-0-87.dsl.netrack.net [199.45.160.85]) by mx1.freebsd.org (Postfix) with ESMTP id 4615C13C49D for ; Sun, 4 Feb 2007 20:24:03 +0000 (UTC) (envelope-from imp@bsdimp.com) Received: from localhost (localhost [127.0.0.1]) by harmony.bsdimp.com (8.13.4/8.13.4) with ESMTP id l14KLGxv016613; Sun, 4 Feb 2007 13:21:23 -0700 (MST) (envelope-from imp@bsdimp.com) Date: Sun, 04 Feb 2007 13:21:50 -0700 (MST) Message-Id: <20070204.132150.1288664462.imp@bsdimp.com> To: freebsd-hackers@dino.sk From: "M. Warner Losh" In-Reply-To: <200702040918.37825.freebsd-hackers@dino.sk> References: <200702031940.00128.freebsd-hackers@dino.sk> <45c5270f.m+ovKhgdkb0p47OA%perryh@pluto.rain.com> <200702040918.37825.freebsd-hackers@dino.sk> X-Mailer: Mew version 4.2 on Emacs 21.3 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.0 (harmony.bsdimp.com [127.0.0.1]); Sun, 04 Feb 2007 13:21:23 -0700 (MST) Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Geode SC1100 i2c bus X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Feb 2007 20:24:03 -0000 In message: <200702040918.37825.freebsd-hackers@dino.sk> Milan Obuch writes: : On Sunday 04 February 2007 01:21, perryh@pluto.rain.com wrote: : > > > The ACB is at the same level than Uart, so I had a look at sio : > > > source and got a big headache. I'm not really used to drivers : > > > nor kernel programming stuff, that's why I need your help. : > > : > > Why do you compare ACB and UART? In FreeBSD, sio is serial i/o : > > controller, not superIO, maybe you are confused... ACB and UART : > > does not have much in common... : > : > As I read the OP, both the ACB and the serial are in the same chip : > (the superIO), so it would seem reasonable to expect that the method : > of accessing the device registers in the (currently unsupported) ACB : > might be similar to the method of accessing the device registers in : > the (supported) serial port. : > : : You are right from the point of view 'how to access registers'. But what OP : wrote could be understand another way, too - he tried to modify sio to create : acb driver, which would not achieve the correct results. There is i2c : infrastructure in FreeBSD, acb driver should fit into its place there and it : is not that easy - I tried to understand it, but nobody could/was willing : to/did not care to help me understand it. I'm happy to help you understand it. Warner