diff --git a/Makefile b/Makefile
index 262ff6b..df4855d 100644
--- a/Makefile
+++ b/Makefile
@@ -72,7 +72,7 @@ clean:
 openocd:
 	$(shell $(OPENOCD) -f scripts/openocd.cfg)
 
-install:
+install: all
 	./scripts/download.sh
 
 -include $(shell find $(BUILD) -name *.d 2> /dev/null)
diff --git a/main.c b/main.c
index 45ce538..477de44 100644
--- a/main.c
+++ b/main.c
@@ -82,14 +82,13 @@ int main(void)
 
 	/* twi */
 	at91_twi_init();
+	at91_twi_test();
 
 	/* usb */
 	at91_udp_init();
 
 	printf("static alloc: %5ld bytes\n\r", static_alloc_used());
 
-	at91_twi_test();
-
 	pitc_schedule_timer(&pitc_test_timer);
 
 	while (1);
diff --git a/src/at91_twi.c b/src/at91_twi.c
index 0d55310..03a8cf1 100644
--- a/src/at91_twi.c
+++ b/src/at91_twi.c
@@ -189,32 +189,48 @@ void at91_twi_test(void)
 {
 	uint32_t i;
 	for (i = TWI_ADDR_BL1; i <= TWI_ADDR_BL4; i++) {
-		uint8_t buf[16];
 		struct blmc_cmd cmd = {
-			.cmd = CMD_GET_INFO,
-			.mode = BLMC_CMD_READ | BLMC_CMD_0_ARG,
-			.size = sizeof(buf),
-			.data = buf,
+			.cmd = CMD_BOOT_LOADER,
+			.mode = BLMC_CMD_WRITE | BLMC_CMD_0_ARG,
 		};
+		uint32_t ret = twi_cmd(i, &cmd);
+		printf("twi[0x%02lx](%ld) ", i, ret);
+
+		volatile uint32_t x;
+		for (x = 0; x < 200000; x++);
+
+		uint8_t buf[16];
+		cmd.cmd = CMD_GET_INFO,
+		cmd.mode = BLMC_CMD_READ | BLMC_CMD_0_ARG,
+		cmd.size = sizeof(buf),
+		cmd.data = buf,
+		ret = twi_cmd(i, &cmd);
+		printf("boot(%ld):'%s' ", ret, buf);
 
-		uint32_t retval = twi_cmd(i, &cmd);
-		printf("twi(0x%02lx): %ld '%s' ", i, retval, buf);
-	
 		cmd.cmd = CMD_GET_SIGNATURE;
 		cmd.size = 4;
-		twi_cmd(i, &cmd);
-		printf("(sig: 0x%02x%02x%02x)\n\r", buf[0], buf[1], buf[2]);
-		
+		ret = twi_cmd(i, &cmd);
+		printf("sig(%ld):0x%02x%02x%02x ", ret, buf[0], buf[1], buf[2]);
+
 		cmd.cmd = CMD_BOOT_APPLICATION;
 		cmd.mode = BLMC_CMD_WRITE | BLMC_CMD_0_ARG;
 		cmd.size = 0;
-		twi_cmd(i, &cmd);
+		ret = twi_cmd(i, &cmd);
+
+		for (x = 0; x < 200000; x++);
+
+		cmd.cmd = CMD_GET_INFO,
+		cmd.mode = BLMC_CMD_READ | BLMC_CMD_0_ARG,
+		cmd.size = sizeof(buf),
+		cmd.data = buf,
+		ret = twi_cmd(i, &cmd);
+		printf("app(%ld):'%s'\n\r", ret, buf);
 	}
 }
 
 void at91_twi_init(void)
 {
-	/* enable Clock */	
+	/* enable Clock */
 	*AT91C_PMC_PCER = (1 << AT91C_ID_TWI);
 
 	/* SDA & SCL from Peripheral A, Open Drain, no Pullup */