remote debug 6.1 kernel in vmware

mirnshi

options GDB was added to 6.x( since 5.x), and we need kgdb to debug the kernel. kgdb and gdb are different, not symbol link. kgdb is a debugger based on gdb.
We use gdb -k to debug the kernel on 4.x.
The kernel conf:
machine  i386
cpu      I686_CPU
ident    RUN
makeoptions DEBUG=-g
options  GDB
options  DEBUG_MEMGUARD
options  DDB
options  KDB
options  KDB_TRACE
options  SCHED_ULE
#options SCHED_4BSD
options  PREEMPTION
options  INET
options  FFS
options  NFSCLIENT
options  NFS_ROOT
options  PROCFS   
options  PSEUDOFS
options  GEOM_GPT
options  COMPAT_43
options  _KPOSIX_PRIORITY_SCHEDULING
options  ADAPTIVE_GIANT
device   apic   
device   eisa
device   pci
device   atkbdc
device   atkbd  
device   vga   
device   sc
device   pmtimer
device   uart
#device  sio   
device   miibus
device   lnc   
device   loop   
device   random
device   ether  
device   pty   
device   bpf   
Add the next lines to /boot/device.hints
hint.uart.0.at="isa"
hint.uart.0.port="0x3f8"
hint.uart.0.flags="0x80"
hint.uart.0.baud="9660"
Reboot both box.
Start to debug.
kgdb -r /dev/cuaa0 kernel.debug
See /sys/conf/NOTES and /sys/i386/conf/NOTES to get more details.

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