help-how can I entrance debug mode in linux

I am learning the linux-0.12 kernel now and I want to simulate it in my centos.


 		 	   		  
I have installed the rpm-package of bochs-2.3.6 in my linux. Although I can run the linux-0.12 kernel in bochs, I didn't find a way to debug it. 
I have read the total help file but didn't find a solution. Can anybody help me solve this problem?

My bochsrc file  is showed  below:# The configuration file for Linux kernel 0.12. # For detailed information about each parameters see the file# bochsrc-sample.txt included in bochs.
display_library: termconfig_interface: textconfig#=======================================================================# MEGS# Set the number of Megabytes of physical memory you want to emulate. #=======================================================================megs: 32
#=======================================================================# ROMIMAGE:# The ROM BIOS controls what the PC does when it first powers on.#=======================================================================romimage: file=$BXSHARE/BIOS-bochs-latest 
#=======================================================================# VGAROMIMAGE# You now need to load a VGA ROM BIOS into C0000.#=======================================================================vgaromimage: file=$BXSHARE/VGABIOS-lgpl-latest
#=======================================================================# CPU:# This defines cpu-related parameters inside Bochs:  Examples:##  Bochs Machine/Compiler                                 Mips# ____________________________________________________________________#  2.2.6 2.6Ghz Intel Core 2 Duo with WinXP/g++ 3.4      21 to 25 Mips#  2.2.6 2.1Ghz Athlon XP with Linux 2.6/g++ 3.4         12 to 15 Mips#  2.0.1 1.6Ghz Intel P4 with Win2000/g++ 3.3             5 to  7 Mips#=======================================================================#cpu: count=1, ips=10000000, reset_on_triple_fault=1
#=======================================================================# FLOPPYA,FLOPPYB:# Point this to pathname of floppy image file or device#=======================================================================floppya: 1_44="bootimage-0.12-hd", status=insertedfloppyb: 1_44="diskb.img", status=inserted
#=======================================================================# ATA[0-3]-MASTER, ATA[0-3]-SLAVE## This defines the type and characteristics of all attached ata devices:#   type=       type of attached device [disk|cdrom] #   mode=       only valid for disks [flat|concat|external|dll|sparse|vmware3]#   mode=       only valid for disks [undoable|growing|volatile]#   path=       path of the image#   cylinders=  only valid for disks#   heads=      only valid for disks#   spt=        only valid for disks#   status=     only valid for cdroms [inserted|ejected]#   biosdetect= type of biosdetection [none|auto], only for disks on ata0 [cmos]#   translation=type of translation of the bios, only for disks [none|lba|large|rechs|auto]#   model=      string returned by identify device command#   journal=    optional filename of the redolog for undoable and volatile disks#   # Point this at a hard disk image file, cdrom iso file, or physical cdrom# device.  To create a hard disk image, try running bximage.  It will help you# choose the size and then suggest a line that works with it.## In UNIX it may be possible to use a raw device as a Bochs hard disk, # but WE DON'T RECOMMEND IT.  In Windows there is no easy way.## In windows, the drive letter + colon notation should be used for cdroms.# Depending on versions of windows and drivers, you may only be able to # access the "first" cdrom in the system.  On MacOSX, use path="drive"# to access the physical drive.## The path is always mandatory. Disk geometry autodetection works with images# created by bximage if CHS is set to 0/0/0 (cylinders are calculated using# heads=16 and spt=63). For other hard disk images and modes the cylinders,# heads, and spt are mandatory.## Default values are:#   mode=flat, biosdetect=auto, translation=auto, model="Generic 1234"## The biosdetect option has currently no effect on the bios## Examples:#   ata0-master: type=disk, mode=flat, path=10M.sample, cylinders=306, heads=4, spt=17#   ata0-slave:  type=disk, mode=flat, path=20M.sample, cylinders=615, heads=4, spt=17#   ata1-master: type=disk, mode=flat, path=30M.sample, cylinders=615, heads=6, spt=17#   ata1-slave:  type=disk, mode=flat, path=46M.sample, cylinders=940, heads=6, spt=17#   ata2-master: type=disk, mode=flat, path=62M.sample, cylinders=940, heads=8, spt=17#   ata2-slave:  type=disk, mode=flat, path=112M.sample, cylinders=900, heads=15, spt=17#   ata3-master: type=disk, mode=flat, path=483M.sample, cylinders=1024, heads=15, spt=63#   ata3-slave:  type=cdrom, path=iso.sample, status=inserted#=======================================================================ata0-master: type=disk, path="rootimage-0.12-hd", mode=flat, cylinders=487, heads=16, spt=63#ata0-slave: type=disk, path="rootimage-0.12-hd1", mode=flat, cylinders=487, heads=16, spt=63
#=======================================================================# BOOT:#=======================================================================boot: floppy#boot: disk#boot: a#boot: c
#=======================================================================# disable the mouse, since DLX is text only#=======================================================================mouse: enabled=1
#=======================================================================# LOG:#=======================================================================#log: /dev/nulllog: bochsout.txt
#=======================================================================# LOG CONTROLS#=======================================================================panic: action=askerror: action=reportinfo: action=reportdebug: action=ignore#debug: action=ignore
#=======================================================================# VGA_UPDATE_INTERVAL:#=======================================================================vga_update_interval: 300000

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