reduce mem size & opt config

1.reduce mem size in stand alone mode
2.use make xxx XIANGSHAN=1 to align mmio space to XiangShan

Makefile

@@ -60,6 +60,10 @@ include Makefile.git
 
 .DEFAULT_GOAL = app
 
+ifdef XIANGSHAN
+	CFLAGS += -DXIANGSHAN=1
+endif
+
 # Compilation flags
 CC = gcc
 LD = gcc

include/device/map.h

@@ -5,8 +5,6 @@
 
 typedef void(*io_callback_t)(uint32_t, int, bool);
 
-#define XIANGSHAN
-
 #ifdef XIANGSHAN
   
   // SD

include/memory/paddr.h

@@ -3,7 +3,11 @@
 
 #include <common.h>
 
-#define PMEM_SIZE (8 * 1024 * 1024 * 1024UL)
+#ifdef _SHARE
+    #define PMEM_SIZE (8 * 1024 * 1024 * 1024UL)
+#else
+    #define PMEM_SIZE (256 * 1024 * 1024UL) 
+#endif
 
 void init_mem();
 

src/device/device.c

@@ -5,8 +5,6 @@
 #include <device/alarm.h>
 #include <SDL2/SDL.h>
 
-#define XIANGSHAN
-
 void init_alarm();
 void init_serial();
 void init_uartlite();