-#define DEBUG_START 0x20000
-#define DEBUG_ROM_ENTRY DEBUG_START
-#define DEBUG_ROM_ENTRY_SIZE (1024 * 4)
-#define DEBUG_ROM_CODE (DEBUG_ROM_ENTRY + DEBUG_ROM_ENTRY_SIZE)
-#define DEBUG_ROM_CODE_SIZE 256
-#define DEBUG_ROM_EXCEPTION (DEBUG_ROM_CODE + DEBUG_ROM_CODE_SIZE)
-#define DEBUG_ROM_EXCEPTION_SIZE 4
-#define DEBUG_RAM_START (DEBUG_ROM_EXCEPTION + DEBUG_ROM_EXCEPTION_SIZE)
-#define DEBUG_RAM_SIZE 64
-#define DEBUG_RAM_END (DEBUG_RAM_START + DEBUG_RAM_SIZE)
-#define DEBUG_END DEBUG_RAM_END
-
-#define DEBUG_EXCHANGE 0x400
-#define DEBUG_EXCHANGE_SIZE 0x20
+// Seems that 0x0 doesn't work.
+#define DEBUG_START 0x100
+#define DEBUG_END (0x1000 - 1)