From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Chris Friesen" Subject: Re: [BUG] serial base baud misdetected in 2.6.27 Date: Tue, 04 Nov 2008 15:30:51 -0600 Message-ID: <4910BF0B.4070607@nortel.com> References: <4910936D.4030605@nortel.com> <20081104192253.151d6ef3@lxorguk.ukuu.org.uk> <4910B0AD.3020802@nortel.com> <20081104203643.77cdfa6c@lxorguk.ukuu.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from zrtps0kp.nortel.com ([47.140.192.56]:36490 "EHLO zrtps0kp.nortel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752724AbYKDVa7 (ORCPT ); Tue, 4 Nov 2008 16:30:59 -0500 In-Reply-To: <20081104203643.77cdfa6c@lxorguk.ukuu.org.uk> Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: Alan Cox Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org Alan Cox wrote: >> like it's hanging off the PCI bus. The vendor/device matches to an Exar >> Corp. XR17C152, which is given a base_baud of 921600 in >> drivers/serial/8250_pci.c. >> >> According to the chip specs, 921600 is correct with the default crystal >> and control register values. However, other crystals can be used and >> there's also a control register bit to enable a prescalar which cuts the >> baud rate by a factor of four. I suspect that one of these has been >> done on our boards. > > Probably. Did your vendor have the sense to set subvendor/subdevice > identifiers that can be used to identify that specific unit ? No idea, but I'll look into it. Thanks for the help. Chris