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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
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