Index: firmware/export/logf.h
===================================================================
--- firmware/export/logf.h	(revision 24309)
+++ firmware/export/logf.h	(working copy)
@@ -29,7 +29,7 @@
 
 #ifndef __PCTOOL__
 
-#define MAX_LOGF_SIZE 16384
+#define MAX_LOGF_SIZE 1024*1024
 
 extern unsigned char logfbuffer[MAX_LOGF_SIZE];
 extern int logfindex;
Index: firmware/usbstack/usb_storage.c
===================================================================
--- firmware/usbstack/usb_storage.c	(revision 24333)
+++ firmware/usbstack/usb_storage.c	(working copy)
@@ -23,7 +23,7 @@
 #include "usb_core.h"
 #include "usb_drv.h"
 #include "usb_class_driver.h"
-/*#define LOGF_ENABLE*/
+#define LOGF_ENABLE
 #include "logf.h"
 #include "storage.h"
 #include "hotswap.h"
Index: firmware/usbstack/usb_hid.c
===================================================================
--- firmware/usbstack/usb_hid.c	(revision 24309)
+++ firmware/usbstack/usb_hid.c	(working copy)
@@ -25,7 +25,7 @@
 #include "kernel.h"
 #include "usb_hid.h"
 #include "usb_class_driver.h"
-/*#define LOGF_ENABLE*/
+#define LOGF_ENABLE
 #include "logf.h"
 
 /* Documents avaiable here: http://www.usb.org/developers/devclass_docs/ */
@@ -180,6 +180,7 @@
 static int cur_buf_send;
 
 static bool active = false;
+static bool currently_sending = false;
 static int ep_in;
 static int usb_interface;
 
@@ -595,6 +596,7 @@
     logf("hid: init connection");
 
     active = true;
+    currently_sending = false;
 }
 
 /* called by usb_core_init() */
@@ -611,12 +613,14 @@
     cur_buf_send = 0;
 
     active = true;
+    currently_sending = false;
 }
 
 void usb_hid_disconnect(void)
 {
     logf("hid: disconnect");
     active = false;
+    currently_sending = false;
 }
 
 /* called by usb_core_transfer_complete() */
@@ -627,6 +631,7 @@
     (void)status;
     (void)length;
 
+    logf("HID: transfer complete: %d %d %d %d",ep,dir,status,length);
     switch (dir)
     {
         case USB_DIR_OUT:
@@ -638,6 +643,7 @@
 
             send_buffer_len[cur_buf_send] = 0;
             HID_BUF_INC(cur_buf_send);
+            currently_sending = false;
             usb_hid_try_send_drv();
             break;
         }
@@ -787,7 +793,15 @@
     if (!length)
         return;
 
+    if (currently_sending)
+    {
+        logf("HID: Already sending");
+        return;
+    }
+
+    logf("HID: Sending %d bytes",length);
     rc = usb_drv_send_nonblocking(ep_in, send_buffer[cur_buf_send], length);
+    currently_sending = true;
     if (rc)
     {
         send_buffer_len[cur_buf_send] = 0;
Index: firmware/target/arm/usb-drv-arc.c
===================================================================
--- firmware/target/arm/usb-drv-arc.c	(revision 24309)
+++ firmware/target/arm/usb-drv-arc.c	(working copy)
@@ -30,7 +30,7 @@
 #include "panic.h"
 #include "usb_drv.h"
 
-/*#define LOGF_ENABLE*/
+#define LOGF_ENABLE
 #include "logf.h"
 
 /* USB device mode registers (Little Endian) */
@@ -709,9 +709,11 @@
     prev_td=0;
     int tdlen;
 
+    logf("starting ep %d %s (%d bytes)",ep_num,send?"send":"receive",len);
     do
     {
         tdlen=MIN(len,16384);
+        logf("getting td for %d bytes",tdlen);
         prepare_td(cur_td, prev_td, ptr, tdlen,pipe);
         ptr+=tdlen;
         prev_td=cur_td;
@@ -719,13 +721,21 @@
         len-=tdlen;
     }
     while(len>0);
-    //logf("starting ep %d %s",ep_num,send?"send":"receive");
+    if(REG_ENDPTCOMPLETE & mask)
+        logf("REG_ENDPTCOMPLETE shows that the endpoint is still busy!");
 
+    logf("REG_ENDPTPRIME = %x",REG_ENDPTPRIME);
+    logf("REG_ENDPTCOMPLETE= %x",REG_ENDPTCOMPLETE);
+    logf("REG_ENDPTSTATUS= %x",REG_ENDPTSTATUS);
+
     qh->dtd.next_td_ptr = (unsigned int)new_td;
     qh->dtd.size_ioc_sts &= ~(QH_STATUS_HALT | QH_STATUS_ACTIVE);
 
     REG_ENDPTPRIME |= mask;
 
+    logf("REG_ENDPTPRIME = %x",REG_ENDPTPRIME);
+    logf("REG_ENDPTCOMPLETE= %x",REG_ENDPTCOMPLETE);
+    logf("REG_ENDPTSTATUS= %x",REG_ENDPTSTATUS);
     if(ep_num == EP_CONTROL && (REG_ENDPTSETUPSTAT & EPSETUP_STATUS_EP0)) {
         /* 32.14.3.2.2 */
         logf("new setup arrived");
@@ -765,6 +775,9 @@
         rc = -4;
         goto pt_error;
     }
+    logf("REG_ENDPTPRIME = %x",REG_ENDPTPRIME);
+    logf("REG_ENDPTCOMPLETE= %x",REG_ENDPTCOMPLETE);
+    logf("REG_ENDPTSTATUS= %x",REG_ENDPTSTATUS);
 
     restore_irq(oldlevel);
 
@@ -910,11 +923,14 @@
     unsigned int mask = REG_ENDPTCOMPLETE;
     REG_ENDPTCOMPLETE = mask;
 
+    logf("transfer complete : %x",mask);
+    logf("transfer complete REG_ENDPTCOMPLETE : %x",REG_ENDPTCOMPLETE);
     for (ep=0; ep<USB_NUM_ENDPOINTS; ep++) {
         int dir;
         for (dir=0; dir<2; dir++) {
             int pipe = ep * 2 + dir;
             if (mask & pipe2mask[pipe]) {
+                logf("ep %d/%d",ep,dir);
                 struct queue_head* qh = &qh_array[pipe];
                 if(qh->wait) {
                     qh->wait=0;
@@ -926,6 +942,7 @@
                 {
                     length += ((td->reserved & DTD_RESERVED_LENGTH_MASK) -
                         ((td->size_ioc_sts & DTD_PACKET_SIZE) >> DTD_LENGTH_BIT_POS));
+                    logf("another td, len=%d",length);
                     td=(struct transfer_descriptor*) td->next_td_ptr;
                 }
                 usb_core_transfer_complete(ep, dir?USB_DIR_IN:USB_DIR_OUT,