my kernel is linux-2.6-vertex 2.6.23-rc2. i make sure that the kernel is running, but nothing output to the serial terminal after "Now booting the kernel". before load_kernel() return, i can use puts() to do some display. i've selected 16550 serial port and add console=ttyS0 to the cmdline. another question, after load_kernel() function, where is the next step? is it head.S? if i am in main.c using start_kernel() function, how can i output something to the serial? referencing many info, so mass, i don't know how to debug this. the XMD provide a gdbserver to connect, but when i use gdb to "target remote" it, it says packet too long..... thanks. ___________________________________________________________ 雅虎邮箱传递新年祝福,个性贺卡送亲朋! http://cn.mail.yahoo.com/gc/index.html?entry=5&souce=mail_mailletter_tagline