M CHANGES → CHANGES

@@ -4,6 +4,7 @@ - GB Audio: Fix zombie mode bit masking
  - GB Audio: Make audio unsigned with bias (fixes mgba.io/i/749)
 Misc:
  - GBA Timer: Use global cycles for timers
+ - GBA: Extend oddly-sized ROMs to full address space (fixes mgba.io/i/722)
 
 0.6.0: (Future)
 Features:

M src/gba/gba.c → src/gba/gba.c

@@ -342,6 +342,16 @@ gba->memory.mirroring = false;
 	gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
 	GBAHardwareInit(&gba->memory.hw, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
 	GBAVFameDetect(&gba->memory.vfame, gba->memory.rom, gba->memory.romSize);
+	if (popcount32(gba->memory.romSize) != 1) {
+		// This ROM is either a bad dump or homebrew. Emulate flash cart behavior.
+#ifndef _3DS
+		void* newRom = anonymousMemoryMap(SIZE_CART0);
+		memcpy(newRom, gba->memory.rom, gba->pristineRomSize);
+		gba->memory.rom = newRom;
+#endif
+		gba->memory.romSize = SIZE_CART0;
+		gba->isPristine = false;
+	}
 	// TODO: error check
 	return true;
 }