GA330-libretro

Status

7days boots into game !!!

Contained herein

• GA330 libretro core
  • uses Unicorn to emulate CPU
• minimal replacement OS for ARM (handles loading of binaries etc.)
• some shared/portable functions (libCCOS)

Compiling

First, you will need:

• C++ compiler for your host platform
• C compiler for embedded ARM (arm-none-eabi-gcc)
• working RetroArch or another libretro host

Then, to build everything:

• compile GA330 core via CMake. this step also generates thunks for miniSYS (bleh)
• compile minisys (make -C minisys)
• run/debug GA330 core via your libretro host

Debugging ARM code

Currently unsolved. Unicorn is based on QEMU, but QEMU GDB stuff is probably not usable there. printf is your friend!

Memory map

0x0408_8000 .. 0x0408_8FFF      memory-mapped I/O space (JTAG); reads & writes are ignored
0x1000_0000 .. 0x13FF_FFFF      RAM, incl. application (64 MiB)
0x1FF0_0000 .. 0x1FFF_FFFF      ARM stack (1 MiB)
0x2000_0000 .. 0x2004_0000      minisys (256 KiB)
0x3000_0000 .. 0x33FF_FFFF      CCDL is loaded here (up to 64 MiB)