diff --git a/atusb/fw/board.h b/atusb/fw/board.h
index cd94e24..9f16e5a 100644
--- a/atusb/fw/board.h
+++ b/atusb/fw/board.h
@@ -64,6 +64,12 @@
 
 #define	BOARD_MAX_mA	40
 
+#ifdef BOOT_LOADER
+#define	NUM_EPS	1
+#else
+#define	NUM_EPS	2
+#endif
+
 #define	HAS_BOARD_SERNUM
 
 extern uint8_t board_sernum[42];
diff --git a/atusb/fw/usb/atu2.c b/atusb/fw/usb/atu2.c
index 74295ba..5d078ae 100644
--- a/atusb/fw/usb/atu2.c
+++ b/atusb/fw/usb/atu2.c
@@ -40,9 +40,6 @@
 #endif
 
 
-#define NUM_EPS	2
-
-
 struct ep_descr eps[NUM_EPS];
 
 
@@ -199,6 +196,8 @@ static void ep_init(void)
 	eps[0].state = EP_IDLE;
 	eps[0].size = 64;
 
+#ifndef BOOT_LOADER
+
 	UENUM = 1;
 	UECONX = (1 << RSTDT) | (1 << EPEN);	/* enable */
 	UECFG0X = (1 << EPTYPE1) | (1 << EPDIR); /* bulk IN */
@@ -211,6 +210,8 @@ static void ep_init(void)
 
 	eps[1].state = EP_IDLE;
 	eps[1].size = 64;
+
+#endif
 }