Right, I know...Got my raspberry pi today.

This repo serves as a collection of low level examples.  No operating
system, embedded or low level embedded or deeply embedded, whatever
your term is for this.

From what we know so far there is a gpu on chip that boots off of I
assume an on chip rom.  This goes to the sd card and does things.  it
appears that the entry point for us as programmers is the kernel.img
file, which appears to be the memory image copied into the ARM memory
before releasing reset on the ARM processor.  The name of course because
this is intended to be a Linux based educational computer, but it is
just a file name, just a memory image.

You will want to go here
http://elinux.org/RPi_Hardware
And get the datasheet for the part
http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf
(might be an old link, find the one on the wiki page)
And the schematic for the board
http://www.raspberrypi.org/wp-content/uploads/2012/04/Raspberry-Pi-Schematics-R1.0.pdf
(might be an old link, find the one on the wiki page)

Ultimately I will make a uart based bootloader.  For now start with
blinker01

I dont normally use .data nor gcc libraries nor C libraries so you can
build most if not all of my examples using a gcc cross compilerl.  Basically
it doesnt matter if you use arm-none-linux-gnueabi or arm-none-eabi.
what was formerly codesourcery.com still has a LITE version of their
toolchain which is easy to come by, easy to install and well maybe not
easy to use but you can use it.  Building your own toolchain from gnu
sources (binutils and gcc) is fairly straight forward and at some point
will create a script to do that for you.