linux-source debugging with kgdb-patch

Hello,

BACKGROUND:

I was keen to see kgdb running for purely academic reasons. Thus, I made a setup of 2 machines for source-level debugging of the linux-kernel. The procedure mentioned on the web-site
[ kgdb.sourceforge.net] has been adhered to. I was able to successfully configure the setup. Also, I decided to use "ddd" front-end on gdb [local m/c] for debugging the kgdb-patched kernel on the remote machine, which is the usual setup for such debugging-efforts.
The m/c to be debugged stops with the message "Waiting for
connection from remote gdb..." until the "target remote" command is run from the "gdb" prompt of "ddd", upon which the m/c to be debugged continues it's bootup till it shows the command-prompt.

PROBLEM:

I was interested in setting a break-point in start_kernel thru' "ddd" such that the boot-up of the m/c to be debugged could be analysed step-by-step remotely. Though, I am able to set the breakpoint in start_kernel(),
the commands "run" or "continue" on the "gdb" prompt, only throw up the following errors :

(gdb) info break
Num Type Disp Enb Address What
7 breakpoint keep y 0xc027e7f0 in start_kernel at
init/main.c:614
(gdb) run
warning: shared library handler failed to enable breakpoint
warning: Cannot insert breakpoint 7:
Cannot access memory at address 0xc027e7f0

QUESTION:

I very strongly suspect that this exercise follows a particular sequence of steps to get it right. Either I am missing some step or I am not following the "order". In either case, I would be glad to receive some help/comments on my academic endeavour to be able to remotely debug the kernel.

- Kindly let me know a solution

- TIA

- Shobhit Mathur