Date: Mon, 20 May 1996 22:54:05 +0200 (MET DST) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-hackers@freebsd.org (FreeBSD hackers) Cc: dennis@etinc.com (Dennis) Subject: Re: Involking DDB Message-ID: <199605202054.WAA06407@uriah.heep.sax.de> In-Reply-To: <199605201438.KAA21695@etinc.com> from Dennis at "May 20, 96 10:38:25 am"
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As Dennis wrote: > > Is there a way to start DDB without a system crash...ie run the kernel in > some sort of monitoring mode on demand? Several of them. Boot with `-d'. This drops you into DDB early in the game, so you can even trace the device probing. Since interrupts are not yet enabled, the ``hot keys'' described below won't work however. Hit the ``hot key'' on the PC keyboard. This is Ctrl-Alt-ESC by default, though i think some syscons keymaps tweak it onto another combination (which i forgot). Compile your kernel with option ``BREAK_TO_DEBUGGER'', use a serial console, and force a line break on the RS-232. This will drop you into DDB on the serial console. (If you've got a PC keyboard + driver as well, its ``hot key'' will do the same, even though the console is a serial one.) -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
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