configs: imx6dl-mamoj: Add DFU support

Add DFU support for BTicino Mamoj board and update
the same steps in README.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Simone CIANNI <simone.cianni@bticino.it>
Signed-off-by: Raffaele RECALCATI <raffaele.recalcati@bticino.it>
diff --git a/board/bticino/mamoj/README b/board/bticino/mamoj/README
index eda9e45..8b0e9c3 100644
--- a/board/bticino/mamoj/README
+++ b/board/bticino/mamoj/README
@@ -13,6 +13,8 @@
 
 1. USB SDP boot
 
+2. eMMC boot (via DFU)
+
 1. USB SDP boot:
 ---------------
 
@@ -55,6 +57,41 @@
 
   We can see U-Boot boot from USB SDP on minicom
 
+2. eMMC boot via DFU:
+--------------------
+
+  Once booted from USB SDP, program the eMMC as below(make sure to connect USB OTG)
+
+  - Change eMMC partition config
+
+     => mmc partconf 2 1 0 0
+
+  - Partition eMMC on host
+
+     => ums 0 mmc 2
+
+    Host will able to detect the eMMC disk as UMS, partition the same.
+
+  - Program SPL
+
+     => setenv dfu_alt_info $dfu_alt_info_spl
+     => dfu 0 mmc 2
+
+     At Host
+
+     # dfu-util -D SPL -a spl
+
+  - Program u-boot-dtb.img
+
+     => setenv dfu_alt_info $dfu_alt_info_uboot
+     => dfu 0 mmc 2
+
+     At Host
+
+     # dfu-util -D u-boot-dtb.img -a u-boot
+
+  Poweroff and Poweron the board and see U-Boot booting from eMMC.
+
 --
 Jagan Teki <jagan@amarulasolutions.com>
 03/12/18