JZ2440 hardware code,use no os,and debug using jtag

Notice: 1.if you want to use openjtag to debug,modify head.S #define OPENJTAG_DEBUG 1 if you want to run the program from nandflash. #define OPENJTAG_DEBUG 0

2.if you encounter "GDB missing ack(2)"error when using openjtag to debug. please add the below in your gdb init file.

set remote memory-write-packet-size 1024 set remote memory-write-packet-size fixed set remote memory-read-packet-size 1024 set remote memory-read-packet-size fixed

3.cpu frequencyset set 400MHZ //