imx233:fuze+: major memory and usb rework

- now identity map dram uncached and have a cached and buffered virtual alias
- rework dma to handle virtual to physical pointers conversion
- fix lcd frame pointer
- implement usb detection properly
- implement bootloader usb properly
- allow the bootloader to disable MMC windowing (useful for recovery)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30432 a1c6a512-1295-4272-9138-f99709370657

firmware/target/arm/imx233/usb-imx233.c

@@ -29,10 +29,20 @@
 #include "system.h"
 #include "system-target.h"
 
-int usb_status = USB_EXTRACTED;
+
+void usb_insert_int(void)
+{
+    usb_status_event(USB_POWERED);
+}
+
+void usb_remove_int(void)
+{
+    usb_status_event(USB_UNPOWERED);
+}
 
 void usb_drv_usb_detect_event()
 {
+    printf("usb_drv_usb_detect_event");
     usb_status_event(USB_INSERTED);
 }
 
@@ -58,16 +68,17 @@ void usb_init_device(void)
 
 int usb_detect(void)
 {
-    return usb_status;
+    return usb_plugged() ? USB_INSERTED : USB_EXTRACTED;
 }
 
 bool usb_plugged(void)
 {
-    return true;
+    return !!(HW_POWER_STS & HW_POWER_STS__VBUSVALID);
 }
 
 void usb_enable(bool on)
 {
+    /* FIXME: power up/down usb phy and pll usb */
     if(on)
         usb_core_init();
     else