Date: Wed, 17 Nov 1999 21:10:58 +0000 (GMT) From: Doug Rabson <dfr@nlsystems.com> To: Greg Lehey <grog@lemis.com> Cc: Zhihui Zhang <zzhang@cs.binghamton.edu>, "Kenneth D. Merry" <ken@kdm.org>, freebsd-hackers@freebsd.org Subject: Re: Set the baud rate on remote debugging Message-ID: <Pine.BSF.4.10.9911172110300.318-100000@salmon.nlsystems.com> In-Reply-To: <19991116205031.07184@mojave.sitaranetworks.com>
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On Tue, 16 Nov 1999, Greg Lehey wrote: > On Monday, 15 November 1999 at 16:46:50 -0500, Zhihui Zhang wrote: > > > > On Mon, 15 Nov 1999, Greg Lehey wrote: > > > >> On Monday, 15 November 1999 at 15:13:53 -0700, Kenneth D. Merry wrote: > >>> Zhihui Zhang wrote... > >>>> > >>>> I have set up a remote debugging environment. But I think default 9600 > >>>> bps is slow. I can use "set remotebaud 19200" on the debugging machine > >>>> side. How can I set the baud rate on the target machine that is running > >>>> the debugged kernel? (I press CTRL+ESC+ALT to drop to DDB mode and find > >>>> no command to set the baud rate). > >>>> > >>>> Any help is appreciated. > >>> > >>> Use the CONSPEED option in the kernel config file on the target machine. > >>> e.g.: > >>> > >>> options CONSPEED=115200 > >> > >> I'm planning to modify ddb to specify the bit rate as a parameter to > >> the gdb command: > >> > >> db> gdb 19200 > >> Next trap will enter GDB remote protocol mode at 19200 bps > >> > >> Comments? > >> > > > > That will be useful. I have just found out that I can use sysctl -w > > machdep.conspeed=19200 to achieve this. But I can not go higher than > > 19200. > > I set 38400 today, but it ran very badly. I think 19200 is probably > as high as you want to go, at least until somebody fixes the buffering > in the UARTs. I've always used 57600 and it seems to work fine... -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 442 9037 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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