imx: kontron-sl-mx6ul: Autostart fastboot if booted from USB

For booting via USB we want to automatically start the fastboot
command in order to access the board via uuu or other tools.

This allows for easier bringup of new boards during development
and manufacturing.

Signed-off-by: Annette Kobou <annette.kobou@kontron.de>
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>

board/kontron/sl-mx6ul/sl-mx6ul.c

@@ -5,7 +5,9 @@
 
 #include <asm/arch/clock.h>
 #include <asm/arch/sys_proto.h>
+#include <asm/arch-mx6/imx-regs.h>
 #include <asm/global_data.h>
+#include <env.h>
 #include <env_internal.h>
 #include <fdt_support.h>
 #include <phy.h>
@@ -87,6 +89,16 @@ int board_init(void)
 	return 0;
 }
 
+int board_late_init(void)
+{
+	if (is_boot_from_usb()) {
+		env_set("bootdelay", "0");
+		env_set("bootcmd", "fastboot 0");
+	}
+
+	return 0;
+}
+
 enum env_location env_get_location(enum env_operation op, int prio)
 {
 	if (prio)