diff --git a/fpgafs_lldrv_dbg.c b/fpgafs_lldrv_dbg.c
index f457c1b..b942920 100644
--- a/fpgafs_lldrv_dbg.c
+++ b/fpgafs_lldrv_dbg.c
@@ -8,16 +8,44 @@
 #include <linux/mm.h>
 #include "fpgafs.h"
 
+#define MEM_SIZE 255
+/* some test memory */
+static char *mem;
+
 static int fpgafs_send_data_dbg(struct fpga_context *ctx, const char __user *buf, int len)
 {
-	printk("fpgafs: send data DEBUG\n");
-	return 0;
+	u32 cp = 0;
+	u8 __user *usr;
+
+	if (mem == NULL)
+		return -EBUSY;
+
+	len = (len > MEM_SIZE)?MEM_SIZE:len;
+
+	if (len < 2)
+		return -EINVAL;
+
+	if (!access_ok(VERIFY_READ, buf, len))
+		return -EFAULT;
+
+	while (cp < len) {
+		usr = (u8*)&buf[cp];
+		if (__get_user(mem[cp], usr))
+			return -EFAULT;
+		cp++;
+	}
+
+	return len;
 }
 
 static int fpgafs_recv_data_dbg(struct fpga_context *ctx, unsigned char *buf, int len)
 {
 	printk("fpgafs: receive data DEBUG\n");
-	return 4;
+	len = (len > MEM_SIZE)?MEM_SIZE:len;
+	if (copy_to_user(buf, mem, len))
+		return -EFAULT;
+
+	return len;
 }
 
 static int fpgafs_read_load_dbg(struct fpga_context *ctx, unsigned char *buf, int len)
@@ -59,10 +87,23 @@ static int fpgafs_write_load_dbg(struct fpga_context *ctx, const char __user *bu
 	return len;
 }
 
+
+static int fpgafs_init_dbg(void)
+{
+	mem = kmalloc(MEM_SIZE,GFP_USER);
+	return 0;
+}
+
+static int fpgafs_exit_dbg(void)
+{
+	kfree(mem);
+	return 0;
+}
+
 static struct fpgafs_lldrv fpgafs_lldrv_dbg = {
 	.name = "dbg",
-	.init = NULL,
-	.exit = NULL,
+	.init = fpgafs_init_dbg,
+	.exit = fpgafs_exit_dbg,
 	.send = &fpgafs_send_data_dbg,
 	.recv = &fpgafs_recv_data_dbg,
 	.read_load = &fpgafs_read_load_dbg,