[realtek-ambz2] Add GDB init command

boards/_base/realtek-ambz2.json

@@ -13,7 +13,13 @@
 	},
 	"debug": {
 		"protocol": "openocd",
-		"protocols": []
+		"protocols": [
+			"openocd"
+		],
+		"openocd_config": "amebaz2.cfg",
+		"gdb_init": [
+			"mem 0x9b000000 0x9c000000 ro"
+		]
 	},
 	"upload": {
 		"maximum_ram_size": 262144,

cores/realtek-ambz2/base/lt_api.c

@@ -7,7 +7,7 @@ extern uint8_t lt_uart_port;
 
 void lt_init_family() {
 	// make the SDK less verbose by default
-	ConfigDebugErr	= 0;
+	ConfigDebugErr	= _DBG_MISC_ | _DBG_FAULT_ | _DBG_BOOT_;
 	ConfigDebugWarn = 0;
 	ConfigDebugInfo = 0;
 	lt_uart_port	= LT_UART_DEFAULT_PORT;