From owner-freebsd-alpha  Tue May 18  9:22:26 1999
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Date: Tue, 18 May 1999 10:12:18 -0600 (MDT)
From: "Justin T. Gibbs" <gibbs@narnia.plutotech.com>
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To: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp>
Cc: freebsd-alpha@FreeBSD.org
Subject: Re: Panic: warning: pmap_changebit didn't.
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In-Reply-To: <14144.54192.153726.48298X@ett.sat.t.u-tokyo.ac.jp> <Pine.BSF.4.05.9905180929080.509-100000@herring.nlsystems.com> <14145.11959.719375.15587A@ett.sat.t.u-tokyo.ac.jp>
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In article <14145.11959.719375.15587A@ett.sat.t.u-tokyo.ac.jp> you wrote:
>> It would be useful to find out the values of pa, *pte and faultoff.
>> 
> 
> Unfortunately I cannot use gdb now.
> 
> db> gdb
> No gdb port enabled. Set flag 0x80 on desired port
> in your configuration file (currently sio only).

I had to hack sio to make this work again and use flags 0xc0 on the sio
port.  It seems you need to reserve the port for 'low level console' duty
if you expect the port to work correctly once interrupts are enabled.

==== //depot/FreeBSD-current/src/sys/isa/sio.c#16 - /usr/src/sys/isa/sio.c ====
*** /tmp/tmp.1623.0	Tue May 18 10:20:10 1999
--- /usr/src/sys/isa/sio.c	Tue May 11 17:19:46 1999
***************
*** 2822,2828 ****
  				siocniobase = iobase;
  				siocnunit = unit;
  			}
! 			if (COM_DEBUGGER(flags) && !COM_LLCONSOLE(flags)) {
  				printf("sio%d: gdb debugging port\n", unit);
  				siogdbiobase = iobase;
  				siogdbunit = unit;
--- 2822,2828 ----
  				siocniobase = iobase;
  				siocnunit = unit;
  			}
! 			if (COM_DEBUGGER(flags) /*&& !COM_LLCONSOLE(flags)*/) {
  				printf("sio%d: gdb debugging port\n", unit);
  				siogdbiobase = iobase;
  				siogdbunit = unit;


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