Date: Wed, 23 Jun 1999 12:32:59 +0100 From: Bob Bishop <rb@gid.co.uk> To: Chris Csanady <ccsanady@scl.ameslab.gov> Cc: "Bill G." <billg@cyberwar.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: Serial Console Wierdness Message-ID: <3.0.6.32.19990623123259.007cde10@192.168.255.1> In-Reply-To: <37702C44.993BFADB@scl.ameslab.gov> References: <Pine.BSF.4.10.9906221322230.3019-100000@outland.cyberwar.com>
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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
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