Add build and flash commands in README.md

Signed-off-by: Pratik Prajapati <[email protected]>

Author: pratik-prajapati-imgtec

README.md

@@ -0,0 +1,29 @@
+# Using u-boot on Creator (Ci40) Marduk platform
+
+### How to build/cross-compile for Ci40:
+
+	$ export CROSS_COMPILE=/path/to/mips-toolchain/mips-toolchain-prefix
+	$ make pistachio_marduk_defconfig
+	$ make
+
+This will generate u-boot-pistachio-nor.img
+
+Note: Using OpenWrt's toolchain toolchain-mipsel_mips32_gcc-5.2.0_musl-1.1.11 will require [this patch](http://lists.denx.de/pipermail/u-boot/2015-July/217911.html) to be applied.
+
+### How to flash on Ci40:
+
+1. [Load OpenWrt](https://github.com/IMGCreator/openwrt/blob/master-pistachio/README.md)
+
+2. Erase and write u-boot image on bootloader partition of Ci40
+
+		$ flashcp -v u-boot-pistachio-nor.img /dev/mtd0
+
+	Note: flashcp needs to be manually selected in OpneWrt menuconfig
+
+		Base system -> busybox -> Cutomize busybox options -> Miscellaneous Utilities -> flashcp
+
+3. Reboot
+
+		$ reboot
+
+_Please be aware that you may brick the board if you flashed a wrong bootloader. Only way to re-cover back the board is to use Dedi-prog SF100 programmer to flash the pre-built bootloader again._