Date: Tue, 18 Apr 2000 09:03:28 +0930 From: Greg Lehey <grog@lemis.com> To: "Nandakumar.p.k" <nanda@procsys.com> Cc: FreeBSD Questions <questions@FreeBSD.org> Subject: Re: Debugging kernel using remote gdb Message-ID: <20000418090327.B514@freebie.lemis.com> In-Reply-To: <38FAEE09.4BB366B9@procsys.com> References: <38FAEE09.4BB366B9@procsys.com>
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On Monday, 17 April 2000 at 16:27:13 +0530, Nandakumar.p.k wrote: > Hi, > > I am not able to directly send the questions to freebsd - questions > hence i am sending this to you. We need to understand why you can't send to -questions. Do you have DNS problems? > We were trying to debug the kernel using remote gdb. We have followed > the instructions given in the Freebsd handbook. OK, I don't have time to look at this now, but I'll try later. In the meantime, I'm forwarding this to FreeBSD-questions. > The host and the target machine were connected using a null modem cable > which was tested using Pcplus utility in DOS. In both the machines the > cable is connected to the COM1 port. The cable has 3 pins connected. Tx > to Rx. Rx to Tx and common ground. With this we are able to send > characters from one machine to other using the terminal emulation pacage > Pcplus in DOS. > > The steps which we followed were as follows. > In the host machine > 1. Made a copy of the GENERIC kernel called MYKERNEL. > 2. The follwing additions were made to MYKERNEL > options DDB > device sio0 at isa? port "IO_COM1" flags 0x080 > 3. Compiled using config -g and installed MYKERNEL . > 4. Made a copy of the kernel , kernel.debug > 5. Copied the kernel.debug to the target machine. > > In the target machine > 1. Strip -x kernel.debug & then reboot. > 2. At the boot prompt ,loaded kernel.debug > 3. Opened the debugger using boot -d > > In the host machine > 1. cd /usr/src/sys/compile/MYKERNEL > 2. gdb -k kernel > 3. (kgdb) target remote /dev/cuaa0 > > In the target > 1.db>gdb > 2. s > > Now the following error message was displayed in the host > Ignoring packet error,continuing.. > Ignoring packet error,continuing.. > Ignoring packet error,continuing.. > Could'nt establish connection to remote target > Malformed response to offset query,timeout > > Any idea what is happening here ? > > Regards, > Nandan > > -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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