See the top level README for information on where to find the schematic and programmers reference manual for the ARM processor on the raspberry pi. Also find information on how to load and run these programs. This simple example sets up a small stack, not much to this program so the stack doesnt need much room. It then enables gpio16 as an output. Then goes into a loop that sets the gpio, waits, resets it, waits, repeat. gpio16 is shown on the schematic to connect to the OK led. One of the bank of leds on the corner near the audio out and host usb ports. The blink rate for me is a few blinks a second perhaps. Future examples will get use a timer if there is one and narrow in on the clock setup, etc. novectors.s is the entry point for this code. This just gets things started then calls a C function (blinker01.c) where the bulk of the program is found.