Date: Thu, 30 Nov 2000 14:01:04 -0700 From: joe_dumont@agilent.com To: grog@lemis.com Cc: questions@FreeBSD.org Subject: remote kernel debugging - Free BSD 3.3 Message-ID: <8BE2D6B9CE9ED4119244009027B68404099238@axand04.and.agilent.com>
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This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_000_01C05B10.A703C3A0 Content-Type: text/plain; charset="iso-8859-1" Hi Greg, My name is Joe and I am sending this email to you because you answered a similar question regarding remote kernel debugging. I hope you might have a few minutes to answer this. I am running Free BSD 3.3 and I am trying to debug a kernel located on another processor. I carefully followed the directions on how to: - build the kernels (including the necessary flags to assign to the serial interfaces); - strip the debug symbols from the target kernel (strip -x kernel); - connect to the remote kernel through a serial port (cuaa0). On the target kernel, I performed a boot -d, entered gdb, and then entered s to step into the next instruction. After successfully connecting to the target kernel, I enter c on the remote system (I am using ddd 3.2.1) and the target kernel completes its load. So, to this point things are going well. I set the debugger to track the serial communications through the statement set remotedebug 1 as shown here: GNU DDD 3.2.1 (i386-portbld-freebsd3.4), by Dorothea L|tkehaus and Andreas Zeller. Copyright ) 1995-1999 Technische Universitdt Braunschweig, Germany. Copyright ) 1999-2000 Universitdt Passau, Germany. Breakpoint 1 at 0xc01acb25: file ../../netinet/ip_input.c, line 265. (gdb) delete 1 (gdb) target remote /dev/cuaa0 Remote debugging using /dev/cuaa0 Debugger (msg=0xc026f3bc "Boot flags requested debugger") at ../../i386/i386/db_interface.c:320 (gdb) set remotedebug 1 (gdb) c Continuing. Sending packet: $mc01a9129,1#c4...Ack Packet received: 31 Sending packet: $Xc01a9129,0:#e8...Ack Packet received: binary downloading NOT suppported by target Sending packet: $Mc01a9129,1:cc#a4...Ack Packet received: OK Sending packet: $mc01a9191,1#c3...Ack Packet received: 8b binary downloading NOT suppported by target Sending packet: $Mc01a9191,1:cc#a3...Ack Packet received: OK Sending packet: $mc01a93fd,1#25...Ack Packet received: 31 binary downloading NOT suppported by target Sending packet: $Mc01a93fd,1:cc#05...Ack Packet received: OK Sending packet: $mc01a92d1,1#ef...Ack Packet received: 8b binary downloading NOT suppported by target Sending packet: $Mc01a92d1,1:cc#cf...Ack Packet received: OK Sending packet: $mc01a9561,1#c4...Ack Packet received: 31 binary downloading NOT suppported by target Sending packet: $Mc01a9561,1:cc#a4...Ack Packet received: OK Sending packet: $Hc0#db...Ack Packet received: Sending packet: $c#63...Ack Packet received: T0508:2a911ac0;05:ecbdd4d0;04:e4bdd4d0; I can see that there is communication to and from the target kernel. When I run a program on the remote system that forces the kernel to execute a function that I am interested in, I start to see the following messages over the serial line: Sending packet: $g#67...Packet received: T0508:2a911ac0;05:ecbdd4d0;04:e4bdd4d0; Sending packet: $g#67...Sending packet: $g#67...Sending packet: $g#67...Timed out. Timed out. Timed out. Ignoring packet error, continuing... Bad register packet; fetching a new packet Timed out. The target system never sends an Ack back to the system on which I am running ddd, and the target at this point hangs. Any ideas why the kernel that I am trying to debug just stops communicating through the serial interface? I appreciate any help/ideas that you have, because I am wits end right now! I have done the obvious checks: new cable, new serial boards, making sure that I can transfer a file through the serial interface (and did it successfully), and I also went back to the instructions in the Free BSD manuals. I am stumped! thanks in advance Joe Dumont ------_=_NextPart_000_01C05B10.A703C3A0 Content-Type: application/octet-stream; name="DUMONT,JOE (A-Andover,ex1).vcf" Content-Disposition: attachment; filename="DUMONT,JOE (A-Andover,ex1).vcf" BEGIN:VCARD VERSION:2.1 N:DUMONT;JOE FN:DUMONT,JOE (A-Andover,ex1) ORG:A-Andover,ex1 EMAIL;PREF;INTERNET:joe_dumont@am.exch.agilent.com REV:20000419T171453Z END:VCARD ------_=_NextPart_000_01C05B10.A703C3A0-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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