OceanBIOS

Custom BIOS for the OCMOS addon for OpenComputers.

WARNING: This project is in very early stage. Reserved memory areas may change, etc etc. Don't expect a very stable experience using this.

Boot sequence

• For each unmanaged drives
  • Load the first 512 bytes
  • Check for boot signature(0xAA55 LE)
    • If signature is valid, reset stack pointer and jump to the boot sector
• Display error message and halt

Disk images

Disk image created by some utilities, such as mkfs.fat, always have a boot sector signature. If you don't want the BIOS to boot a disk image, you can simply remove the said signature before compressing them for OpenComputers.

Building

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Before building this project, make sure you have the LLVM-MOS SDK installed for compiling 6502 binaries.

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Run the following commands from the cloned repository:

mkdir build && cd build
cmake ..
make

You should now have two built files, bios.bin and bios.bin.elf. The former is a raw binary file for flashing onto an EEPROM, and the latter contains the BIOS in ELF format.