Date: Sat, 26 Apr 2014 16:34:38 -0700 From: Bakul Shah <bakul@bitblocks.com> To: Winston Smith <smith.winston.101@gmail.com> Cc: FreeBSD ARM <freebsd-arm@freebsd.org> Subject: Re: Looking for FreeBSD u-boot/kernel debugging help (BeagleBone Black) Message-ID: <20140426233438.49123B827@mail.bitblocks.com> In-Reply-To: Your message of "Sat, 26 Apr 2014 18:29:35 EDT." <CADH-AwHN0=p4z0RJZNcoRdoDJTMVAtK5F3TNCh5qdMWessQ0KQ@mail.gmail.com> References: <CADH-AwHN0=p4z0RJZNcoRdoDJTMVAtK5F3TNCh5qdMWessQ0KQ@mail.gmail.com>
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On Sat, 26 Apr 2014 18:29:35 EDT Winston Smith <smith.winston.101@gmail.com> wrote: > I also discovered that if I disconnect my > serial terminal and reconnect it, it seems to bring the FreeBSD kernel > to a debug prompt of sorts -- is there any documentation on this? I suspect disconnecting/reconnecting the serial cable looks like a break to the kernel and that drops it into the debugger "ddb". [Though I can't seem to send a real break to it using kermit!] Type c and hit return to continue. To disable this behavior I think you can do sysctl debug.kbd.break_to_debugger=0 or add debug.kbd.break_to_debugger=0 to /etc/sysctl.conf man 1 ddb -- for debugger commands man 4 ddb -- for kernel config options to control ddb behavior
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