xiangfu wrote: > I write some code. but i don't know how to download it to GTA02 > and how to run it?
You can use u-boot from NOR for this: - press and hold AUX, then press and hold POWER until the boot menu comes up. Then release POWER and AUX. The title of the boot menu should read "*** BOOT MENU (NOR) ***" - download your program into RAM (at address 0x32000000), with dfu-util -a 0 -R -D led_on - connect to the u-boot console over the serial interface or over USB - copy your program from RAM to NAND: nand erase u-boot nand write.e 0x32000000 0 0x1000 Then reboot and see what happens ... Right, nothing. This is where the fun of debugging begins ;-) A few hints: - you have the on/off logic inversed: 1 means "on", 0 means "off". - your delay loop is slower than you may expect. Try changing it to 0xffff. After changing the delay loop, the LEDs should flash a few times, then suddenly stop. Can you guess why ? There is also a faster way for loading code than DFU: start OpenOCD, then do this > reset halt > load_image /path/to/led_on 0 > resume This will load your code into SteppingStone's BootSRAM (see below) and execute it from there. Note that if you use this approach, the program is lost after a reset. > another question : > where is the GTA02's LED? :-) You mean physically ? There is a red LED behind the AUX button and there are a blue and an orange LED behind the POWER button. If you open the front cover of the Neo, you can see the red LED behind AUX very clearly. > what is the best TEXT_BASE value 0 is the right choice. See also figure 6-4 on page 6-9 of the SC32442B54 manual. The "SteppingStone" boot loader (inside the CPU) loads the first 4kB if NAND into this buffer. - Werner
