See the top level README for information on where to find documentation for the raspberry pi and the ARM processor inside. Also find information on how to load and run these programs. These examples are for the pi3, see other directories for other flavors of raspberry pi. The raspberry pi family is more similar than different, but I have decided it is easier to manage by grouping the examples by board type. The pi3 is not only a different board but the Broadcom chip is different as well. This time they cut out the Cortex A7 from the pi2 and replaced it with a Cortex A8 which is a quad core 64 bit ARM core. Like the pi2 the peripherals are now found a base address of 0x3Fxxxxxx. The 64 bit ARM instruction set is a complete do-over, not binary compatible with their 32 bit instruction set. But they do have a compatibility mode which runs the legacy 32 bit instruction set. See the aarch32 directory for legacy 32 bit mode, and aarch64 for the 64 bit mode. My preferred way to run examples is to use my bootloader07 kernel7.img on the board with an ftdi usb to uart board or cable. I also solder a momentary pushbutton on the RUN pins, which is basically a board reset. There are ways to do this without soldering, pins you can push in rather than solder. Once the sd card is in with bootloader07, press reset, download the intel hex (.hex) version of the program I want to run. Press 'g' to go. Repeat as necessary. Or you can copy the .bin file in an example to the kernel7.img file on your sd card, replace the sd card and turn the power on.