configs/olimex_a13_olinuxino: new defconfig

Add initial support for a13_olinuxino board
with below features
- U-Boot 2017.05
- Linux 4.11.5
- Default packages from buildroot

Signed-off-by: Chakra Divi <chakra@openedev.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
[Thomas:
 - use full name in DEVELOPERS file
 - remove parametrization of the post-build.sh script, just hardcode
   the boot.cmd file used as input
 - add missing dosfstools and mtools host packages in defconfig,
   needed because a vfat partition is defined in the genimage.cfg
   file
 - minor tweaks to readme.txt file.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

board/olimex/a13_olinuxino/boot.cmd

@@ -0,0 +1,7 @@
+setenv bootargs console=ttyS0,115200 earlyprintk root=/dev/mmcblk0p2 rootwait
+
+mmc dev 0
+fatload mmc 0 $kernel_addr_r zImage
+fatload mmc 0 $fdt_addr_r sun5i-a13-olinuxino.dtb
+
+bootz $kernel_addr_r - $fdt_addr_r

board/olimex/a13_olinuxino/genimage.cfg

@@ -0,0 +1,34 @@
+image boot.vfat {
+        vfat {
+                files = {
+                        "zImage",
+                        "sun5i-a13-olinuxino.dtb",
+                        "boot.scr"
+                }
+        }
+        size = 64M
+}
+
+image sdcard.img {
+	hdimage {
+	}
+
+	partition u-boot {
+		in-partition-table = "no"
+		image = "u-boot-sunxi-with-spl.bin"
+		offset = 8192
+		size = 1040384 # 1MB - 8192
+	}
+
+        partition boot {
+                partition-type = 0xC
+                bootable = "true"
+                image = "boot.vfat"
+        }
+
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+	}
+}

board/olimex/a13_olinuxino/post-build.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+MKIMAGE=$HOST_DIR/usr/bin/mkimage
+
+$MKIMAGE -A arm -O linux -T script -C none \
+	 -d board/olimex/a13_olinuxino/boot.cmd \
+	 ${BINARIES_DIR}/boot.scr

board/olimex/a13_olinuxino/readme.txt

@@ -0,0 +1,43 @@
+A13-OLinuXino
+
+Intro
+=====
+
+This default configuration will allow you to start experimenting with
+the buildroot environment for the A13-OLinuXino. With the current
+configuration it will bring-up the board, and allow access through the
+serial console.
+
+For more details about the A13-OLinuXino:
+
+https://www.olimex.com/Products/OLinuXino/A13/A13-OLinuXino/open-source-hardware
+
+How to build it
+===============
+
+Configure Buildroot:
+
+    $ make olimex_a13_olinuxino_defconfig
+
+Compile everything and build the rootfs image:
+
+    $ make
+
+Note: you will need access to the internet to download the required
+sources.
+
+How to write the SD card
+========================
+
+The sdcard.img file is a complete bootable image ready to be written
+on the boot medium. To install it, simply copy the image to a micro SD
+card:
+
+    # dd if=output/images/sdcard.img of=/dev/sdX
+
+Notes:
+  - replace 'sdX' with the actual device with your micro SDcard,
+  - you may need to be root to do that (use 'sudo').
+
+Eject the SD card, insert it in the A13-OLinuXino board, and power it
+up.