Bump buidlroot version to 2018.02.6

bsp/buildroot/board/atmel/at91sam9x5ek_mmc/genimage.cfg

@@ -0,0 +1,39 @@
+# Image for SD card boot on Atmel at91sam9x5ek boards
+#
+image boot.vfat {
+	vfat {
+		files = {
+			"zImage",
+			"at91sam9g15ek.dtb",
+			"at91sam9g25ek.dtb",
+			"at91sam9g35ek.dtb",
+			"at91sam9x25ek.dtb",
+			"at91sam9x35ek.dtb",
+			"boot.bin",
+			"u-boot.bin"
+		}
+
+		file uboot.env {
+			image = "uboot-env.bin"
+		}
+	}
+	size = 16M
+}
+
+image sdcard.img {
+	hdimage {
+	}
+
+	partition boot {
+		partition-type = 0xC
+		bootable = "true"
+		image = "boot.vfat"
+		offset = 1M
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+		size = 512M
+	}
+}

bsp/buildroot/board/atmel/at91sam9x5ek_mmc/uboot-env.txt

@@ -0,0 +1,7 @@
+bootargs=console=ttyS0,115200 root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait video=Unknown-1:800x480-16
+bootcmd=fatload mmc 0:1 0x21000000 at91sam9g35ek.dtb; fatload mmc 0:1 0x22000000 zImage; bootz 0x22000000 - 0x21000000
+bootdelay=1
+ethact=gmac0
+stderr=serial
+stdin=serial
+stdout=serial