The MCPX (Multimedia Communications Processor - Xbox chipset) boot ROM is the very first code the original Xbox runs. It initializes the hardware and loads the main BIOS from the hard drive or flash.
Appendix A — Example Commands
flashrom -p ch341a_spi -r mcp_bootrom.bin
sha256sum mcp_bootrom.bin
binwalk -e mcp_bootrom.bin
strings mcp_bootrom.bin | grep -i uart
qemu-system-arm -machine myboard -bios mcp_bootrom.bin -S -gdb tcp::1234
arm-none-eabi-gdb mcp_bootrom.elf
(gdb) target remote :1234
Appendix B — Suggested Project Structure Mcpx Boot Rom Image Xemu
If you want, I can:
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Assuming you have obtained a valid mcpx_boot_rom.bin (usually 1,024 or 2,048 bytes in size), here is how to integrate it into Xemu. qemu-system-arm -machine myboard -bios mcp_bootrom