[U-Boot] at91, usb, dfu: add dfu support for at91 boards

[Heiko Schocher <hs@denx.de>]

Hello all,

I have a request for implementing DFU support an at91 based boards
(in this case for the siemens at91 boards corvus, taurus both in
mainline).

I found in include/configs/sama5d3xek.h

/* USB */
#define CONFIG_CMD_USB

#ifdef CONFIG_CMD_USB
#define CONFIG_USB_ATMEL
#define CONFIG_USB_ATMEL_CLK_SEL_UPLL
#define CONFIG_USB_OHCI_NEW
#define CONFIG_SYS_USB_OHCI_CPU_INIT
#define CONFIG_SYS_USB_OHCI_REGS_BASE           ATMEL_BASE_OHCI
#define CONFIG_SYS_USB_OHCI_SLOT_NAME           "sama5d3"
#define CONFIG_SYS_USB_OHCI_MAX_ROOT_PORTS      3
#define CONFIG_DOS_PARTITION
#define CONFIG_USB_STORAGE
#endif

/* USB device */
#define CONFIG_USB_GADGET
#define CONFIG_USB_GADGET_DUALSPEED
#define CONFIG_USB_GADGET_ATMEL_USBA
#define CONFIG_USB_ETHER
#define CONFIG_USB_ETH_RNDIS
#define CONFIG_USBNET_MANUFACTURER      "Atmel SAMA5D3xEK"

So, if I am correct, that USB gadget support should work on at91 (and
so DFU support should not be to hard to implement)?

Any hints, ideas?

bye,
Heiko
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