diff --git a/make_riscv.py b/make_riscv.py
index 1c4bf3a..fc470ed 100644
--- a/make_riscv.py
+++ b/make_riscv.py
@@ -7,7 +7,7 @@ import dataclasses
 from multiprocessing import Process,Queue,Value,cpu_count
 
 
-
+# os.environ["PATH"]="/home/andy/source/my_riscv/bin:"+os.environ["PATH"]
 
 CC="riscv64-unknown-elf-gcc"
 OBJCPY="riscv64-unknown-elf-objcopy"
@@ -24,7 +24,7 @@ CFLAG=[
   "-Wall",
   "-Werror",
   "-g",
-  "-O0",
+  "-Os",
   "-fno-omit-frame-pointer",
   "-msave-restore"
 ]
@@ -244,12 +244,30 @@ def main():
   build_target(SRC)
   os.system(f"{OBJCPY} -O binary {OUTPUT}/{TARGET}.elf {OUTPUT}/{TARGET}.bin")
   os.system(f"{OBJCPY} -O ihex {OUTPUT}/{TARGET}.elf {OUTPUT}/{TARGET}.hex")
-  os.system(f"{OBJDUMP} -d {OUTPUT}/{TARGET}.elf > {OUTPUT}/{TARGET}.lst")
+  os.system(f"{CC} -v > {OUTPUT}/{TARGET}.lst 2>&1")
+  os.system(f"{OBJDUMP} -d {OUTPUT}/{TARGET}.elf >> {OUTPUT}/{TARGET}.lst")
 
 
 
+# 生成fpga的加载文件
+def create_coe_file():
+  with open(f"{OUTPUT}/{TARGET}.bin", mode="rb") as f:
+    data=f.read()
+  data_len=len(data)//4
+  with open(f"{OUTPUT}/{TARGET}.coe", mode='w+') as f:
+    f.write("memory_initialization_radix = 16;\n")
+    f.write("memory_initialization_vector =\n")
+    for index in range(data_len):
+      temp=data[index*4]|(data[index*4+1]<<8)|\
+        (data[index*4+2])<<16|(data[index*4+3]<<24)
+      f.write(f"{temp:08x},\n")
+    for index in range(65536-data_len):
+      f.write(f"{0:08x},\n")
+
+
 if __name__ == "__main__":
   tick_start=time.time()
   main()
+  create_coe_file()
   tick_end=time.time()
   print(f"cost: {tick_end-tick_start}")
diff --git a/riscv/riscv.ld b/riscv/riscv.ld
index 53960e4..1e87dd3 100644
--- a/riscv/riscv.ld
+++ b/riscv/riscv.ld
@@ -4,8 +4,8 @@ ENTRY( _start )
 
 MEMORY
 {
-  flash (rxai!w) : ORIGIN = 0x80000000, LENGTH = 1024K
-  dram (wxa!ri)  : ORIGIN = 0x10000000, LENGTH = 1024K
+  flash (rxai!w) : ORIGIN = 0x80000000, LENGTH = 256K
+  dram (wxa!ri)  : ORIGIN = 0x10000000, LENGTH = 128K
 }
 
 
diff --git a/riscv/startup/main.c b/riscv/startup/main.c
index 5dd91bf..218865c 100644
--- a/riscv/startup/main.c
+++ b/riscv/startup/main.c
@@ -4,11 +4,37 @@
 #include "head.h"
 #include "rtthread.h"
 
-#define PRINT_BASE_ADDR *(uint8_t *)0x40000000
 
-int my_putc(int c) {
-  PRINT_BASE_ADDR = c;
-  return c;
+#define UART0_BASE      (0x30000000)
+#define UART0_CTRL      (UART0_BASE + (0x00))
+#define UART0_STATUS    (UART0_BASE + (0x04))
+#define UART0_BAUD      (UART0_BASE + (0x08))
+#define UART0_TXDATA    (UART0_BASE + (0x0c))
+#define UART0_RXDATA    (UART0_BASE + (0x10))
+
+#define UART0_REG(addr) (*((volatile uint32_t *)addr))
+
+// send one char to uart
+void my_putc(uint8_t c)
+{
+    while (UART0_REG(UART0_STATUS) & 0x1);
+    UART0_REG(UART0_TXDATA) = c;
+}
+
+// Block, get one char from uart.
+uint8_t uart_getc()
+{
+    UART0_REG(UART0_STATUS) &= ~0x2;
+    while (!(UART0_REG(UART0_STATUS) & 0x2));
+    return (UART0_REG(UART0_RXDATA) & 0xff);
+}
+
+// 115200bps, 8 N 1
+void uart_init()
+{
+    // enable tx and rx
+    UART0_REG(UART0_CTRL) = 0x3;
+
 }
 
 
@@ -61,7 +87,9 @@ int main()
   rt_thread_startup(t);
   my_printf("enter while 1\n");
   while (1) {
-    my_printf("main: %s\n", g_string);
+    rt_size_t total, used, max_used;
+    rt_memory_info(&total, &used, &max_used);
+    my_printf("main: total=%d, used=%d, max_used=%d\n", total,used,max_used);
     rt_thread_delay(1000);
   }
   return 0;
diff --git a/riscv/startup/rtconfig.h b/riscv/startup/rtconfig.h
index 16556b4..6d9e01b 100755
--- a/riscv/startup/rtconfig.h
+++ b/riscv/startup/rtconfig.h
@@ -40,10 +40,12 @@
 /* Memory Management */
 
 #define RT_USING_MEMPOOL
-#define RT_USING_SLAB
+// #define RT_USING_SLAB
 #define RT_USING_MEMHEAP
-#define RT_MEMHEAP_FAST_MODE
-#define RT_USING_SLAB_AS_HEAP
+#define RT_USING_SMALL_MEM
+// #define RT_MEMHEAP_FAST_MODE
+// #define RT_USING_SLAB_AS_HEAP
+#define RT_USING_MEMHEAP_AS_HEAP
 #define RT_USING_HEAP
 #define RT_USING_DEVICE
 #define RT_USING_SCHED_THREAD_CTX
diff --git a/riscv/startup/rtthread_irq.c b/riscv/startup/rtthread_irq.c
index 2afb0e3..2a87b66 100644
--- a/riscv/startup/rtthread_irq.c
+++ b/riscv/startup/rtthread_irq.c
@@ -88,11 +88,27 @@ static void tick_handler(int vec, void* par) {
 }
 
 
-static uint32_t g_mem_heap[200 * 1024 / 4];
+static uint32_t g_mem_heap[100 * 1024 / 4];
+
+void mem_test_uint8_t() {
+  uint8_t *p = (uint8_t *)g_mem_heap;
+  for (int i = 0; i < 1024;i++){
+    p[i] = i & 0xff;
+  }
+  for (int i = 0; i < 1024;i++){
+    if(p[i]!=(i&0xff)){
+      rt_kprintf("mem test failed\n");
+    }
+  }
+  rt_kprintf("mem test succesed\n");
+
+}
+
 void rt_hw_board_init(void) {
   set_csr(mie, (1 << 3) | (1 << 7));
   set_csr(mip, (1 << 3));
-  rt_system_heap_init(g_mem_heap, g_mem_heap + sizeof(g_mem_heap) / 4);
+  mem_test_uint8_t();
+  rt_system_heap_init(g_mem_heap, &g_mem_heap[sizeof(g_mem_heap) / 4]);
   rt_hw_interrupt_init();
   rt_hw_interrupt_install(7, tick_handler, 0, "tick_handler");
 }
diff --git a/riscv/startup/start.S b/riscv/startup/start.S
index 8f7a312..4b34ba5 100644
--- a/riscv/startup/start.S
+++ b/riscv/startup/start.S
@@ -10,6 +10,9 @@
 _start:
 
     la sp, _sp
+    li a0, 0x3000000c
+    li a1, 0x38
+    sw a1, (a0)
 
     /* Load data section */
     la a0, _data_lma
diff --git a/riscv_cpu/print.c b/riscv_cpu/print.c
index b7b4fce..9fd4e21 100644
--- a/riscv_cpu/print.c
+++ b/riscv_cpu/print.c
@@ -4,8 +4,8 @@
 #include "stdio.h"
 
 
-#define PRINT_BASE_ADDR 0x40000000
-#define PRINT_SIZE 0x4
+#define PRINT_BASE_ADDR 0x30000000
+#define PRINT_SIZE 0x20
 
 #define dev_wr(addr) g_map[(addr-PRINT_BASE_ADDR) >> 2]
 #define dev_wrb(addr) ((uint8_t *)g_map)[(addr-PRINT_BASE_ADDR)]
@@ -13,7 +13,7 @@
 
 
 
-static uint32_t g_map[1];
+static uint32_t g_map[8];
 
 static uint32_t read(uint32_t addr) {
   if (!(addr & 0x3)) {
@@ -38,13 +38,15 @@ static void write(uint32_t addr, uint32_t data) {
   } else {
     dev_wrb(addr) = data;
   }
-  if (g_index < BUFF_LEN) {
-    g_buff[g_index++] = data;
-  }
-  if (data == '\n') {
-    g_buff[g_index] = 0;
-    printf("\033[33m%s\033[0m", g_buff);
-    g_index = 0;
+  if(((addr&(~0x3))&0xff)==0xc){
+    if (g_index < BUFF_LEN) {
+      g_buff[g_index++] = g_map[3];
+    }
+    if (data == '\n') {
+      g_buff[g_index] = 0;
+      printf("\033[33m%s\033[0m", g_buff);
+      g_index = 0;
+    }
   }
 }