allow booting bootrom

src/main.rs

@@ -17,6 +17,10 @@ struct Args {
     /// BootROM path
     #[arg(short, long)]
     bootrom: String,
+
+    /// Just run BootROM
+    #[arg(long)]
+    run_bootrom: bool,
 }
 
 type Address = u16;
@@ -156,10 +160,18 @@ fn main() {
     let args = Args::parse();
 
     let rom: ROM = fs::read(args.rom).expect("Could not load ROM");
-    let _bootrom: ROM = fs::read(args.bootrom).expect("Could not load BootROM");
+    let bootrom: ROM = fs::read(args.bootrom).expect("Could not load BootROM");
+    let mut state = State::default();
+    let run_rom = if args.run_bootrom {
+        state.pc = Register { as_u16: 0x0 };
+        bootrom
+    } else {
+        rom
+    };
+
     let mut cpu = CPU {
-        memory: Memory::init(rom),
+        memory: Memory::init(run_rom),
-        state: State::default(),
+        state,
     };
     loop {
         cpu.exec_next();