Merge from bittboy/buildroot@db180c0

board/ci20/readme.txt

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+*********************
+* MIPS Creator CI20 *
+*********************
+
+Introduction
+============
+
+The 'ci20_defconfig' will create a root filesystem and a kernel image
+under the 'output/images/' directory. This document will try to explain how
+to use them in order to run Buildroot in the MIPS Creator CI20 board.
+
+How to build it
+===============
+
+Configure Buildroot
+-------------------
+
+  $ make ci20_defconfig
+
+Build the rootfs
+----------------
+
+Note: you will need to have access to the network, since Buildroot will
+download the packages' sources.
+
+You may now build your rootfs with:
+
+  $ make
+
+(This may take a while, consider getting yourself a coffee ;-) )
+
+How to write the SD card
+========================
+
+Once the build process is finished you will have an image called
+"sdcard.img" in the output/images/ directory.
+
+Make sure the SD card is not mounted then copy the bootable "sdcard.img" onto
+it with "dd":
+
+  $ sudo dd if=output/images/sdcard.img of=/dev/sdX
+
+Insert the SDcard into your ci20, and power it up. Your new system
+should come up now and start a console on the UART HEADER.
+
+see: https://elinux.org/CI20_Hardware#Dedicated_UART_header