am335x_evm: Enable DFU for NAND and MMC, provide example alt_infos

- Add CONFIG_DFU_NAND, CONFIG_DFU_MMC
- Set dfu_alt_info_nand, dfu_alt_info_emmc and dfu_alt_info_mmc to show
  working examples for those cases.
- Increase CONFIG_SYS_MAXARGS due to hush parsing bugs that would
  otherwise disallow 'setenv dfu_alt_info ${dfu_alt_info_nand}'.
- Enable CONFIG_FAT_WRITE to allow updating on MMC

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Tom Rini <trini@ti.com>

include/configs/am335x_evm.h

@@ -64,6 +64,9 @@
 	"optargs=\0" \
 	"mtdids=" MTDIDS_DEFAULT "\0" \
 	"mtdparts=" MTDPARTS_DEFAULT "\0" \
+	"dfu_alt_info_mmc=" DFU_ALT_INFO_MMC "\0" \
+	"dfu_alt_info_emmc=rawemmc mmc 0 3751936\0" \
+	"dfu_alt_info_nand=" DFU_ALT_INFO_NAND "\0" \
 	"mmcdev=0\0" \
 	"mmcroot=/dev/mmcblk0p2 ro\0" \
 	"mmcrootfstype=ext4 rootwait\0" \
@@ -171,8 +174,8 @@
 
 #define CONFIG_CMD_ECHO
 
-/* max number of command args */
-#define CONFIG_SYS_MAXARGS		16
+/* We set the max number of command args high to avoid HUSH bugs. */
+#define CONFIG_SYS_MAXARGS		64
 
 /* Console I/O Buffer Size */
 #define CONFIG_SYS_CBSIZE		512
@@ -201,6 +204,7 @@
 #define CONFIG_CMD_MMC
 #define CONFIG_DOS_PARTITION
 #define CONFIG_CMD_FAT
+#define CONFIG_FAT_WRITE
 #define CONFIG_CMD_EXT2
 #define CONFIG_CMD_EXT4
 #define CONFIG_CMD_FS_GENERIC
@@ -213,6 +217,38 @@
 #define CONFIG_CMD_SF
 #define CONFIG_SF_DEFAULT_SPEED		(24000000)
 
+/* USB Composite download gadget - g_dnl */
+#define CONFIG_USB_GADGET
+#define CONFIG_USBDOWNLOAD_GADGET
+
+/* USB TI's IDs */
+#define CONFIG_USBD_HS
+#define CONFIG_G_DNL_VENDOR_NUM 0x0403
+#define CONFIG_G_DNL_PRODUCT_NUM 0xBD00
+#define CONFIG_G_DNL_MANUFACTURER "Texas Instruments"
+
+/* USB Device Firmware Update support */
+#define CONFIG_DFU_FUNCTION
+#define CONFIG_DFU_MMC
+#define CONFIG_DFU_NAND
+#define CONFIG_CMD_DFU
+#define DFU_ALT_INFO_MMC \
+	"boot part 0 1;" \
+	"rootfs part 0 2;" \
+	"MLO fat 0 1;" \
+	"MLO.raw mmc 100 100;" \
+	"u-boot.img.raw mmc 300 3C0;" \
+	"u-boot.img fat 0 1;" \
+	"uEnv.txt fat 0 1"
+#define DFU_ALT_INFO_NAND \
+	"SPL part 0 1;" \
+	"SPL.backup1 part 0 2;" \
+	"SPL.backup2 part 0 3;" \
+	"SPL.backup3 part 0 4;" \
+	"u-boot part 0 5;" \
+	"kernel part 0 7;" \
+	"rootfs part 0 8"
+
  /* Physical Memory Map */
 #define CONFIG_NR_DRAM_BANKS		1		/*  1 bank of DRAM */
 #define PHYS_DRAM_1			0x80000000	/* DRAM Bank #1 */
@@ -357,6 +393,7 @@
 #define CONFIG_MUSB_GADGET
 #define CONFIG_MUSB_PIO_ONLY
 #define CONFIG_USB_GADGET_DUALSPEED
+#define CONFIG_USB_GADGET_VBUS_DRAW	2
 #define CONFIG_MUSB_HOST
 #define CONFIG_AM335X_USB0
 #define CONFIG_AM335X_USB0_MODE	MUSB_PERIPHERAL