diff --git a/firmware/SOURCES b/firmware/SOURCES
index 9b576d435a..d0862ba37b 100644
--- a/firmware/SOURCES
+++ b/firmware/SOURCES
@@ -1013,7 +1013,7 @@ target/arm/tcc77x/kernel-tcc77x.c
 target/arm/tcc77x/powermgmt-tcc77x.c
 target/arm/tcc77x/system-tcc77x.c
 target/arm/tcc77x/timer-tcc77x.c
-target/arm/tcc77x/usb-tcc77x.c
+target/arm/usb-tcc.c
 target/arm/tcc77x/logikdax/button-logikdax.c
 target/arm/tcc77x/logikdax/power-logikdax.c
 #ifndef BOOTLOADER
@@ -1034,7 +1034,7 @@ target/arm/tcc77x/kernel-tcc77x.c
 target/arm/tcc77x/powermgmt-tcc77x.c
 target/arm/tcc77x/system-tcc77x.c
 target/arm/tcc77x/timer-tcc77x.c
-target/arm/tcc77x/usb-tcc77x.c
+target/arm/usb-tcc.c
 target/arm/tcc77x/m200/button-m200.c
 target/arm/tcc77x/m200/power-m200.c
 #ifndef BOOTLOADER
@@ -1055,7 +1055,7 @@ target/arm/tcc77x/c100/lcd-S6B33B2.c
 target/arm/tcc77x/powermgmt-tcc77x.c
 target/arm/tcc77x/system-tcc77x.c
 target/arm/tcc77x/timer-tcc77x.c
-target/arm/tcc77x/usb-tcc77x.c
+target/arm/usb-tcc.c
 target/arm/tcc77x/c100/button-c100.c
 target/arm/tcc77x/c100/power-c100.c
 #ifndef BOOTLOADER
@@ -1110,7 +1110,7 @@ target/arm/tcc77x/kernel-tcc77x.c
 target/arm/tcc77x/timer-tcc77x.c
 target/arm/tcc77x/adc-tcc77x.c
 target/arm/tcc77x/powermgmt-tcc77x.c
-target/arm/tcc77x/usb-tcc77x.c
+target/arm/usb-tcc.c
 target/arm/tcc77x/iaudio7/lcd-iaudio7.c
 target/arm/tcc77x/iaudio7/power-iaudio7.c
 target/arm/tcc77x/iaudio7/button-iaudio7.c
@@ -1135,8 +1135,8 @@ target/arm/tcc780x/cowond2/button-cowond2.c
 target/arm/tcc780x/cowond2/lcd-cowond2.c
 target/arm/tcc780x/cowond2/power-cowond2.c
 target/arm/tcc780x/cowond2/powermgmt-cowond2.c
-target/arm/tcc780x/cowond2/usb-cowond2.c
 target/arm/tcc780x/cowond2/backlight-cowond2.c
+target/arm/usb-tcc.c
 #ifndef BOOTLOADER
 target/arm/tcc780x/kernel-tcc780x.c
 target/arm/tcc780x/timer-tcc780x.c
diff --git a/firmware/export/config-cowond2.h b/firmware/export/config-cowond2.h
index c6e4555f18..edeb834ef7 100644
--- a/firmware/export/config-cowond2.h
+++ b/firmware/export/config-cowond2.h
@@ -8,6 +8,14 @@
 
 #define MODEL_NAME   "Cowon D2"
 
+#if 0
+#define HAVE_USBSTACK
+#define USE_ROCKBOX_USB
+#define USB_VENDOR_ID 0x0e21
+#define USB_PRODUCT_ID 0x0800
+#endif
+
+
 /* Produce a dual-boot bootloader.bin for mktccboot */
 #define TCCBOOT
 
diff --git a/firmware/export/usb-tcc7xx.h b/firmware/export/usb-tcc.h
similarity index 100%
rename from firmware/export/usb-tcc7xx.h
rename to firmware/export/usb-tcc.h
diff --git a/firmware/target/arm/tcc77x/usb-tcc77x.c b/firmware/target/arm/usb-tcc.c
similarity index 99%
rename from firmware/target/arm/tcc77x/usb-tcc77x.c
rename to firmware/target/arm/usb-tcc.c
index f5bb7c9ff2..345f6bed78 100644
--- a/firmware/target/arm/tcc77x/usb-tcc77x.c
+++ b/firmware/target/arm/usb-tcc.c
@@ -22,7 +22,7 @@
 #include "config.h"
 #include "usb.h"
 
-#include "usb-tcc7xx.h"
+#include "usb-tcc.h"
 
 #include "cpu.h"
 #include "system.h"
diff --git a/firmware/usbstack/usb_core.c b/firmware/usbstack/usb_core.c
index 6003c8d197..5f22d87c5e 100644
--- a/firmware/usbstack/usb_core.c
+++ b/firmware/usbstack/usb_core.c
@@ -314,7 +314,17 @@ static void set_serial_descriptor(void)
     usb_string_iSerial.bLength=68;
 }
 #else
-#error No set_serial_descriptor() implementation for this target
+#warning No proper set_serial_descriptor() implementation for this target
+static void set_serial_descriptor(void)
+{
+    short* p = &usb_string_iSerial.wString[1];
+    int i;
+    for (i = 0; i < 16; i++) {
+        *p++ = hex[(2*i)&0xF];
+        *p++ = hex[(2*i+1)&0xF];
+    }
+    usb_string_iSerial.bLength=68;
+}
 #endif
 
 void usb_core_init(void)