Date: Mon, 30 Aug 1999 14:35:44 -0400 (EDT) From: Zhihui Zhang <zzhang@cs.binghamton.edu> To: freebsd-hackers@freebsd.org Subject: Help with remote debugging (gdb -k) Message-ID: <Pine.GSO.3.96.990830142223.10304D-100000@sol.cs.binghamton.edu>
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After reading the handbook and some postings in the mailing list archive. I still can not make remote debugging work. I basically did the following on FreeBSD-current 4.0 (A is debugging machine, B is the target): (1) Build a debug kernel (options DDB and BREAK_TO_DEBUGGER) on box A. The sio flag I used is 0x90 (I also tried 0x80). Ftp the file /kernel to box B and renamed as /kernel.A (2) Boot the kernel /kernel.A on box B with -d option: >>FreeBSD/i386 boot Default: 0:wd(0,a)/boot/loader boot: /kernel.A -d Debugger("Boot flags requested debugger") Stopped at 0xc0252c27: movl $0, 0xc031ed98 db> gdb Next trap will enter GDB remote protocol mode db> s (3) On machine A, go to the compile directory: #gdb -g kernel.debug (kgdb) target remote /dev/cuaa0 Remote debugging using /dev/cuaa0 Ignoring packet error, continuing... Ignoring packet error, continuing... Couldn't establish connection to remote target Malformed response to offset query, timeout The serial cable is null-modem and has been tested with kermit. It is connected to /dev/ttyd0 (com 1) of machine B and com 2 of machine A. I did not do "strip -x" because I assume this is done by FreeBSD 4.0 automatically and the file debug.kernel is the one with symbols. Any help is appreciated. -------------------------------------------------- Zhihui Zhang. Please visit http://www.freebsd.org -------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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