Raspberry Pi USB booting code
This is the USB MSD boot code which should work on the Raspberry Pi model A,
Compute Module, Compute module 3 and Raspberry Pi Zero.
This version of rpiboot has been modified to work from directories which contain the booting firmware. There is a default directory msd/ which contains bootcode.bin and start.elf to turn the Raspberry Pi device into a USB Mass Storage Device (MSD).