Date: Tue, 16 Nov 1999 20:50:31 -0500 From: Greg Lehey <grog@mojave.sitaranetworks.com> To: Zhihui Zhang <zzhang@cs.binghamton.edu> Cc: "Kenneth D. Merry" <ken@kdm.org>, freebsd-hackers@FreeBSD.ORG Subject: Re: Set the baud rate on remote debugging Message-ID: <19991116205031.07184@mojave.sitaranetworks.com> In-Reply-To: <Pine.GSO.3.96.991115164451.6663D-100000@sol.cs.binghamton.edu>; from Zhihui Zhang on Mon, Nov 15, 1999 at 04:46:50PM -0500 References: <19991115175303.59865@mojave.sitaranetworks.com> <Pine.GSO.3.96.991115164451.6663D-100000@sol.cs.binghamton.edu>
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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. Greg -- Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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