This contains source code and a basic build system for OC-ARM ROMs and "boot programs". Some useful ones:

• bin/boot0.rom: A basic bootloader, which can boot an ELF file from any connected filesystem. It searches each filesystem for /OC-ARM and attempts to boot it.
• bin/tetris.rom: A clone of a certain Tetromino-based game, residing entirely in EEPROM and using only the 256 byte built-in SRAM for working memory. Contains some examples of how to efficiently do IO from ROM in assembly.
• bin/test.elf: A bootable ELF written in C that prints out some information on the low-level emulated hardware. It does not include (or demonstrate how to use) any standard C library, and it requires allowSerialDebugCP=true in OpenComputers-ARM.cfg in order to work. (Look in your Minecraft log for its output.)
• bin/redclock.rom: Designed for use in a microcontroller with a redstone card. Pulses the north/-Z redstone output between 15 and 0 at 1Hz. Also written in C, also does not include or demonstrate a C library. Not at all tolerant of problems.
• bin/infinity.rom: An infinite loop. Good for demonstrating OC-ARM's timing restrictions and little else.
• bin/loud_infinity.rom: A message on CP7, then an infinite loop. Good for diagnosing startup hangs, testing OC-ARM's timing restrictions, and little else.

To build this, you need clang 3.5 or later and an ARM build of GNU binutils. Configure binutils targeting arm-none-eabi or arm-linux, and edit the top of GNUmakefile to point to your built versions of those tools. Then just run make in this directory. ROMs are given in both ELF and preloaded (suitable for use with flash) format. ELFs are given in both stripped and unstripped (suitable for use with gdb/addr2line/etc.) format. All programs also give a disassembly of the linked code alongside the built binary.