From owner-freebsd-hackers Wed Jun 23 4:34: 0 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from gidgate.gid.co.uk (gidgate.gid.co.uk [193.123.140.1]) by hub.freebsd.org (Postfix) with ESMTP id 8E3BD14D2E for ; Wed, 23 Jun 1999 04:33:57 -0700 (PDT) (envelope-from rb@gid.co.uk) Received: (from rb@localhost) by gidgate.gid.co.uk (8.8.8/8.8.7) id MAA05887; Wed, 23 Jun 1999 12:33:02 +0100 (BST) (envelope-from rb) Message-Id: <3.0.6.32.19990623123259.007cde10@192.168.255.1> X-Sender: rbmail@192.168.255.1 X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.6 (32) Date: Wed, 23 Jun 1999 12:32:59 +0100 To: Chris Csanady From: Bob Bishop Subject: Re: Serial Console Wierdness Cc: "Bill G." , freebsd-hackers@FreeBSD.ORG In-Reply-To: <37702C44.993BFADB@scl.ameslab.gov> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Hi, At 19:37 22/06/99 -0500, Chris Csanady wrote: >"Bill G." wrote: >> >> I got a serial console working on COM2, to which I have connected >> another FreeBSD box. I connect with 'cu' fine, but I'm running into >> a couple of problems which I haven't been able to find and answer >> for. >> >> o When I connect, when the machine is first turned on, I get >> disconnected twice during the boot up sequence (cu reports >> Got hangup signal) -- looks like when the sio1 device is >> probed, and also when getty runs. > >This happens when the serial chip gets reset, and the DCD line >goes low for a moment. [etc] Some buggy UARTs drop control lines when the baud rate is set, even if it's being set to the current value. There used (eons ago) to be a patch for this (don't set the baud rate if it's already the desired value); someone who knows the driver better than I do should check that it's not still a problem. -- Bob Bishop +44 118 977 4017 rb@gid.co.uk fax +44 118 989 4254 (0800-1800 UK) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message