From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932197AbWFFOs4 (ORCPT ); Tue, 6 Jun 2006 10:48:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932194AbWFFOs4 (ORCPT ); Tue, 6 Jun 2006 10:48:56 -0400 Received: from server1.meinberg.de ([85.10.202.66]:18613 "EHLO paolo.meinberg.de") by vger.kernel.org with ESMTP id S932197AbWFFOs4 (ORCPT ); Tue, 6 Jun 2006 10:48:56 -0400 Message-ID: <448595CC.8040607@meinberg.de> Date: Tue, 06 Jun 2006 16:48:44 +0200 From: Heiko Gerstung Organization: Meinberg Radio Clocks User-Agent: Thunderbird 1.5.0.2 (X11/20060601) MIME-Version: 1.0 To: Lennart Sorensen CC: Jesper Juhl , linux-kernel@vger.kernel.org Subject: Re: Backport of a 2.6.x USB driver to 2.4.32 - help needed References: <44854F74.50406@meinberg.de> <9a8748490606060423t102384f4m626b4366898ce9cd@mail.gmail.com> <448569CE.1020906@meinberg.de> <20060606144334.GA7859@csclub.uwaterloo.ca> In-Reply-To: <20060606144334.GA7859@csclub.uwaterloo.ca> X-Enigmail-Version: 0.94.0.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, Lennart: Lennart Sorensen wrote: > On Tue, Jun 06, 2006 at 01:41:02PM +0200, Heiko Gerstung wrote: >> Yes, but unfortunately I have no chance to do this and therefore I rely >> on others to do this. Well, the same applies to [me] and [kernel >> drivers], but I hoped that it might be easier to try and backport one >> driver instead of trying to improve other people's code (maybe that is >> what OPC stands for :-)), especially when this code has a much larger >> impact on several parts of the kernel. > > Which part of PPS doesn't work on 2.6 if you have the PPS-kit-light > installed? There is a version for 2.6.15 around, which applies to > 2.6.16 with minimal fixing. Only problem I found so far with the code > was that it breaks the serial console on my system, but that was easy to > fix. I still have to test it though since my serial port has the CD > line stuck high at the moment until I can get the board fixed, so > testing is a bit tricky. > > I know I have run a gps receiver with PPS on the CD line under 2.6.8 > using PPS-kit-light, and it worked rather well. It works but on my system it takes ~4 hours before I reach lower microsecond offsets, where the 2.4 ppskit is below 10 microseconds after four polling cycles. I already tried to fix that but the internal kernel pps discipline is not working as good as it did with the 2.4 ppskit versions. > > Len Sorensen Kind regards, Heiko -- ------------------------------------------------------------------------ *MEINBERG Funkuhren GmbH & Co. KG* Auf der Landwehr 22 D-31812 Bad Pyrmont, Germany Tel.: ++49 (0)5281 9309-25 Fax: ++49 (0)5281 9309-30 eMail: heiko.gerstung@meinberg.de Internet: www.meinberg.de ------------------------------------------------------------------------ Meinberg radio clocks: 25 years of accurate time worldwide