How to modify Ubuntu 10.04.1 Grub entry for supporting KGDB kernel image

Question

I am trying to update target m/c grub.cfg file for KGDB setup but while booting the m/c it got hung completely and not asking/waiting for remote gdb connection. Following is the entry which I added:-

menuentry 'Ubuntu, with Linux 2.6.32-24-kgdb' --class ubuntu --class gnu-linux --class gnu --class os {
        recordfail
        insmod ext2
        set root='(hd0,1)'
        search --no-floppy --fs-uuid --set 12878c3b-c553-4b4b-986a-6e32daea3ad1
        linux   /vmlinuz-2.6.32-kgdb root=/dev/mapper/ubuntu-root ro kgdbwait kgdboe=@192.168.140.23/,@192.168.140.158/  quiet
        initrd  /initrd.img-2.6.32-24-server
}

I have also compiled and copied /boot/vmlinuz-2.6.15.5-kgdb & /boot/System.map-2.6.15.5-kgdb to target m/c from devlopement m/c.

STD entry before adding KGDB in grub.cfg was:-

menuentry 'Ubuntu, with Linux 2.6.32-24-server' --class ubuntu --class gnu-linux --class gnu --class os {
        recordfail
        insmod ext2
        set root='(hd0,1)'
        search --no-floppy --fs-uuid --set 12878c3b-c553-4b4b-986a-6e32daea3ad1
        linux   /vmlinuz-2.6.32-24-server root=/dev/mapper/ubuntu-root ro   quiet
        initrd  /initrd.img-2.6.32-24-server
}

Please suggest how to get rid of this problem.