From 8d97b3ad95a2584aa31e281cfe2d6977f790803a Mon Sep 17 00:00:00 2001
From: Eric Nelson <eric.nelson@boundarydevices.com>
Date: Thu, 2 Oct 2014 12:16:44 -0700
Subject: nitrogen6x: config: expose SATA, then MMC over USB

If no boot script was found, expose internal storage over the
USB mass storage gadget to allow easy programming.

This is especially useful when SD cards are inaccessible or when
loading SATA drives.

More details are available in this blog post:
        http://boundarydevices.com/u-boot-usb-mass-storage-gadget/

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>

diff --git a/include/configs/nitrogen6x.h b/include/configs/nitrogen6x.h
index 3c24443..b31b922 100644
--- a/include/configs/nitrogen6x.h
+++ b/include/configs/nitrogen6x.h
@@ -180,6 +180,7 @@
 #endif
 
 #define CONFIG_DRIVE_TYPES CONFIG_DRIVE_SATA CONFIG_DRIVE_MMC CONFIG_DRIVE_USB
+#define CONFIG_UMSDEVS CONFIG_DRIVE_SATA CONFIG_DRIVE_MMC
 
 #if defined(CONFIG_SABRELITE)
 #define CONFIG_EXTRA_ENV_SETTINGS \
@@ -260,6 +261,7 @@
 #else
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"bootdevs=" CONFIG_DRIVE_TYPES "\0" \
+	"umsdevs=" CONFIG_UMSDEVS "\0" \
 	"console=ttymxc1\0" \
 	"clearenv=if sf probe || sf probe || sf probe 1 ; then " \
 		"sf erase 0xc0000 0x2000 && " \
@@ -281,7 +283,26 @@
 		"echo ; echo 6x_bootscript not found ; " \
 		"echo ; echo serial console at 115200, 8N1 ; echo ; " \
 		"echo details at http://boundarydevices.com/6q_bootscript ; " \
-		"setenv stdout serial\0" \
+		"setenv stdout serial;" \
+		"setenv stdin serial,usbkbd;" \
+		"for dtype in ${umsdevs} ; do " \
+			"if itest.s sata == ${dtype}; then " \
+				"initcmd='sata init' ;" \
+			"else " \
+				"initcmd='mmc rescan' ;" \
+			"fi; " \
+			"for disk in 0 1 ; do " \
+				"if $initcmd && $dtype dev $disk ; then " \
+					"setenv stdout serial,vga; " \
+					"echo expose ${dtype} ${disk} " \
+						"over USB; " \
+					"ums 0 $dtype $disk ;" \
+				"fi; " \
+		"	done; " \
+		"done ;" \
+		"setenv stdout serial,vga; " \
+		"echo no block devices found;" \
+		"\0" \
 	"initrd_high=0xffffffff\0" \
 	"upgradeu=for dtype in ${bootdevs}" \
 		"; do " \
-- 
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