SAMA5 OHCI: Fix some problems with D-Cache coherency and physical addressing related to interrupt endpoints

ChangeLog

@@ -5606,3 +5606,7 @@
 	  to provide prettier ps command output.  src/sam_usb.c:  Use more
 	  descriptive task names when starting the EHCI and OHCI monitor tasks
 	  (2013-9-20).
+	* arch/arm/src/sama5/sam_ohci.c:  Fix a place where DMA-related data
+	  needed to be flushed to data cache; Fix another where a virual address
+	  was being used in a register where a physical address was required
+	  (2013-9-20).

arch/arm/src/sama5/sam_ohci.c

@@ -3108,6 +3108,7 @@ static void sam_disconnect(FAR struct usbhost_driver_s *drvr)
 
 FAR struct usbhost_connection_s *sam_ohci_initialize(int controller)
 {
+  uintptr_t physaddr;
   uint32_t regval;
   uint8_t *buffer;
   irqstate_t flags;
@@ -3192,6 +3193,9 @@ FAR struct usbhost_connection_s *sam_ohci_initialize(int controller)
 
   memset((void*)&g_hcca, 0, sizeof(struct ohci_hcca_s));
 
+  cp15_clean_dcache((uint32_t)&g_hcca,
+                    (uint32_t)&g_hcca + sizeof(struct ohci_hcca_s));
+
   /* Initialize user-configurable EDs */
 
   for (i = 0; i < SAMA5_OHCI_NEDS; i++)
@@ -3274,7 +3278,8 @@ FAR struct usbhost_connection_s *sam_ohci_initialize(int controller)
 
   /* Set HCCA base address */
 
-  sam_putreg((uint32_t)&g_hcca, SAM_USBHOST_HCCA);
+  physaddr = sam_physramaddr((uintptr_t)&g_hcca);
+  sam_putreg(physaddr, SAM_USBHOST_HCCA);
 
   /* Clear pending interrupts */
 

configs/sama5d3x-ek/README.txt

@@ -1220,6 +1220,22 @@ Configurations
         -rw-rw-rw-    1503 sz-1.log
         -rw-rw-rw-     613 .bashrc
 
+       Or, if a (supported) USB keyboard is connected, a /dev/kbda device
+       will appear:
+
+       nsh> ls /dev
+       /dev:
+        console
+        kbda
+        mtdblock0
+        null
+        ttyS0
+
+       /dev/kbda is a read-only serial device.  Reading from /dev/kbda will
+       get keyboard input as ASCII data (other encodings are possible):
+
+       nsh> cat /dev/kbda
+
     The following features are *not* enabled in the demo configuration but
     might be of some use to you: