help with remote debug!!

[chester@linux.org.tw]

Hi....!
I got some confuse about remote debug feature on gdb.
(I have read some GDB doc).
Build all of cross-compile in my PC for StrongARM and bootable
kernel that uses cross-compile.
Then i do the following command,
$ arm-unknown-linux-gdb vmlinux

and,
(gdb) set remotebaud 115200
(gdb) target remote /dev/ttyS0
(gdb) run

But it hang on connect to remote target,no message on my terminal.

What can i do for it ?? Or more doc i can study??

Thanks,
				Chester