diff --git a/software/bios/ddrinit.c b/software/bios/ddrinit.c
index c4f4173f4..84990ac14 100644
--- a/software/bios/ddrinit.c
+++ b/software/bios/ddrinit.c
@@ -19,6 +19,7 @@
 #include <stdlib.h>
 
 #include <hw/dfii.h>
+#include <hw/mem.h>
 
 #include "ddrinit.h"
 
@@ -42,8 +43,6 @@ static void init_sequence(void)
 {
 	int i;
 	
-	printf("Sending initialization sequence...\n");
-	
 	/* Bring CKE high */
 	setaddr(0x0000);
 	CSR_DFII_BA_P0 = 0;
@@ -172,11 +171,45 @@ void ddrwr(char *startaddr)
 	CSR_DFII_COMMAND_P1 = DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS|DFII_COMMAND_WRDATA;
 }
 
+#define TEST_SIZE (4*1024*1024)
+
+int memtest_silent(void)
+{
+	volatile unsigned int *array = (unsigned int *)SDRAM_BASE;
+	int i;
+	unsigned int prv;
+	
+	prv = 0;
+	for(i=0;i<TEST_SIZE/4;i++) {
+		prv = 1664525*prv + 1013904223;
+		array[i] = prv;
+	}
+	
+	prv = 0;
+	for(i=0;i<TEST_SIZE/4;i++) {
+		prv = 1664525*prv + 1013904223;
+		if(array[i] != prv)
+			return 0;
+	}
+	return 1;
+}
+
+void memtest(void)
+{
+	if(memtest_silent())
+		printf("OK\n");
+	else
+		printf("Failed\n");
+}
+
 int ddrinit(void)
 {
-	printf("Initializing DDR SDRAM...\n");
+	printf("Initializing DDRAM...\n");
 	
 	init_sequence();
+	CSR_DFII_CONTROL = DFII_CONTROL_SEL|DFII_CONTROL_CKE;
+	if(!memtest_silent())
+		return 0;
 	
 	return 1;
 }
diff --git a/software/bios/ddrinit.h b/software/bios/ddrinit.h
index cabffd345..e1085fc44 100644
--- a/software/bios/ddrinit.h
+++ b/software/bios/ddrinit.h
@@ -18,11 +18,13 @@
 #ifndef __DDRINIT_H
 #define __DDRINIT_H
 
-int ddrinit(void);
 void ddrsw(void);
 void ddrhw(void);
 void ddrrow(char *_row);
 void ddrrd(char *startaddr);
 void ddrwr(char *startaddr);
+int memtest_silent(void);
+void memtest(void);
+int ddrinit(void);
 
 #endif /* __DDRINIT_H */
diff --git a/software/bios/main.c b/software/bios/main.c
index 5a72cf16a..7225b35e2 100644
--- a/software/bios/main.c
+++ b/software/bios/main.c
@@ -352,12 +352,13 @@ static void do_command(char *c)
 	else if(strcmp(token, "rcsr") == 0) rcsr(get_token(&c));
 	else if(strcmp(token, "wcsr") == 0) wcsr(get_token(&c), get_token(&c));
 	
-	else if(strcmp(token, "ddrinit") == 0) ddrinit();
 	else if(strcmp(token, "ddrrow") == 0) ddrrow(get_token(&c));
 	else if(strcmp(token, "ddrsw") == 0) ddrsw();
 	else if(strcmp(token, "ddrhw") == 0) ddrhw();
 	else if(strcmp(token, "ddrrd") == 0) ddrrd(get_token(&c));
 	else if(strcmp(token, "ddrwr") == 0) ddrwr(get_token(&c));
+	else if(strcmp(token, "memtest") == 0) memtest();
+	else if(strcmp(token, "ddrinit") == 0) ddrinit();
 
 	else if(strcmp(token, "") != 0)
 		printf("Command not found\n");
@@ -384,10 +385,10 @@ static void crcbios(void)
 	length = (unsigned int)&_edata - offset_bios;
 	actual_crc = crc32((unsigned char *)offset_bios, length);
 	if(expected_crc == actual_crc)
-		printf("I: BIOS CRC passed (%08x)\n", actual_crc);
+		printf("BIOS CRC passed (%08x)\n", actual_crc);
 	else {
-		printf("W: BIOS CRC failed (expected %08x, got %08x)\n", expected_crc, actual_crc);
-		printf("W: The system will continue, but expect problems.\n");
+		printf("BIOS CRC failed (expected %08x, got %08x)\n", expected_crc, actual_crc);
+		printf("The system will continue, but expect problems.\n");
 	}
 }
 
@@ -395,7 +396,7 @@ static void print_mac(void)
 {
 	unsigned char *macadr = (unsigned char *)FLASH_OFFSET_MAC_ADDRESS;
 
-	printf("I: MAC address: %02x:%02x:%02x:%02x:%02x:%02x\n", macadr[0], macadr[1], macadr[2], macadr[3], macadr[4], macadr[5]);
+	printf("MAC address: %02x:%02x:%02x:%02x:%02x:%02x\n", macadr[0], macadr[1], macadr[2], macadr[3], macadr[4], macadr[5]);
 }
 
 static const char banner[] =
@@ -441,6 +442,7 @@ static void readstr(char *s, int size)
 int main(int i, char **c)
 {
 	char buffer[64];
+	int ddr_ok;
 
 	rescue = !((unsigned int)main > FLASH_OFFSET_REGULAR_BIOS);
 
@@ -449,11 +451,16 @@ int main(int i, char **c)
 	uart_init();
 	printf(banner);
 	crcbios();
-	print_mac();
-	ddrinit();
-	
 	if(rescue)
-		printf("I: Booting in rescue mode\n");
+		printf("Rescue mode\n");
+	print_mac();
+	ddr_ok = ddrinit();
+	if(ddr_ok) {
+		printf("Booting...\n");
+	} else {
+		printf("Memory initialization failed\n");
+	}
+	
 	
 	while(1) {
 		putsnonl("\e[1mBIOS>\e[0m ");
diff --git a/software/include/hw/mem.h b/software/include/hw/mem.h
new file mode 100644
index 000000000..b440a48e6
--- /dev/null
+++ b/software/include/hw/mem.h
@@ -0,0 +1,23 @@
+/*
+ * Milkymist SoC (Software)
+ * Copyright (C) 2012 Sebastien Bourdeauducq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __HW_MEM_H
+#define __HW_MEM_H
+
+#define SDRAM_BASE		(0x40000000)
+
+#endif /* __HW_MEM_H */
diff --git a/tb/asmicon/asmicon_wb.py b/tb/asmicon/asmicon_wb.py
index 28f6dc286..78aaddf6c 100644
--- a/tb/asmicon/asmicon_wb.py
+++ b/tb/asmicon/asmicon_wb.py
@@ -10,18 +10,18 @@ from common import sdram_phy, sdram_geom, sdram_timing, DFILogger
 l2_size = 8192 # in bytes
 
 def my_generator():
+	#for x in range(20):
+		#t = TWrite(x, x)
+		#yield t
+		#print(str(t) + " delay=" + str(t.latency))
 	for x in range(20):
-		t = TWrite(x, x)
-		yield t
-		print(str(t) + " delay=" + str(t.latency))
-	for x in range(20):
-		t = TRead(x)
-		yield t
-		print(str(t) + " delay=" + str(t.latency))
-	for x in range(20):
-		t = TRead(x+l2_size//4)
+		t = TRead(4194304//4 + x)
 		yield t
 		print(str(t) + " delay=" + str(t.latency))
+	#for x in range(20):
+		#t = TRead(x+l2_size//4)
+		#yield t
+		#print(str(t) + " delay=" + str(t.latency))
 
 def main():
 	controller = ASMIcon(sdram_phy, sdram_geom, sdram_timing)