Hi,

How to add a KGDB patches in linux kernel 2.6.18?

Hi,

U need to follow the following steps..........

On development machine:

1) Extract a kernel source
$ cd /mnt/work/build/old-pc
$ bunzip2 -c ~/linux-2.4.6.tar.bz2 | tar xvf -
$ mv linux linux-2.4.6-kgdb

2. Apply kgdb patch Versions 2.0 onwards have multiple kgdb patches.
$ cd linux-2.4.6-kgdb
$ patch -p1 < ~/linux-2.4.6-kgdb.patch

3. Configure the kernel
$ make xconfig or make menuconfig
Configure drivers and other kernel options
To enable kgdb, enable following config options (in this order).
Kernel hacking ->
KGDB: kernel debugging with remote gdb ->
KGDB: Thread analysis
KGDB: Console messages through gdb
Device drivers ->
Character devices ->
Serial drivers ->
KGDB: On generic serial port (8250)
For kernel versions prior to kgdb 2.0.1:
Goto "kernel hacking"
Enable "Remote (serial) kernel debugging with gdb"
This will enable debugging support in the kernel.
(Optional) Enable "Console messages through gdb (NEW)"

4. Build the kernel
$ make dep
$ make bzImage

5. Copy the kernel to target machine
It is assumed that the user who is working on the development machine has rsh permissions on the test machine for root account.
$ rcp System.map testmach:/boot/System.map-2.4.6-kgdb
$ rcp arch/i386/boot/bzImage testmach:/boot/vmlinuz-2.4.6-kgdb


On test machine:

6. Add a grub entry:
title 2.6.0 kgdb
root (hd0,0)
kernel /boot/vmlinuz-2.6.0 ro root=/dev/hda1 rootfstype=ext3 kgdbwait kgdb8250=1,57600
An example lilo entry for kgdb versions prior to 2.0 is shown below.
image=/boot/vmlinuz-2.4.6
label=kgdb
read-only
root=/dev/hda3
append="gdb gdbttyS=1 gdbbaud=115200"


If any pblm, let me know....


Thanks & Regards,
Riju.