Date: Fri, 18 Jun 1999 13:45:42 -0600 From: Wes Peters <wes@softweyr.com> To: Greg Lehey <grog@lemis.com> Cc: FreeBSD current users <FreeBSD-current@FreeBSD.ORG>, FreeBSD Hackers <hackers@FreeBSD.ORG> Subject: Re: Remote serial gdb--status? Message-ID: <376AA1E6.F529ED99@softweyr.com> References: <19990618114450.Q9893@freebie.lemis.com>
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Greg Lehey wrote:
>
> I've been away from work for several weeks, and I now find that I can
> no longer start remote serial gdb. I am using sio0 on the debugged
> machine side, and sio1 on the debugging machine side. Here are the
> relevant dmesg outputs:
>
> panic (debugged machine):
>
> sio0: system console
> sio0: gdb debugging port
> ...
> sio0 at port 0x3f8-0x3ff irq 4 flags 0x90 on isa0
> sio0: type 16550A
>
> freebie (debugging machine):
>
> sio1 at port 0x2f8-0x2ff irq 3 on isa0
> sio1: type 16550A
> sio1: interrupting at irq 3
>
> I can communicate fine using cu, and a breakout box shows all modem
> signals asserte (DCD, DTR, DSR, RTS, CTS). When I go into remote
> debug on panic, RxD flashes, and when freebie tries to attach to
> panic, TxD flashes, so I'm obviously addressing the correct ports.
> I've checked the bit rate and configuration of the ports before going
> into debug, and they look right (9600 bps, cs8, -istrip, -parenb). I
> don't know what else to look for. Any ideas?
I think you need flags 0x50 (instead of 0x90) on panic. From sio(4):
Meaning of flags:
...
0x00010 device is potential system console
0x00020 device is forced to become system console
0x00040 device is reserved for low-level IO (e. g. for remote
kernel debugging)
...
--
"Where am I, and what am I doing in this handbasket?"
Wes Peters Softweyr LLC
http://www.softweyr.com/~softweyr wes@softweyr.com
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