beaglebone: adds barebox bootloader

jkt: This is a port of https://patchwork.ozlabs.org/patch/614226/

Change-Id: I646d843fe2b9248d5a2ed3855142f1545b7bab52
Signed-off-by: Jan Kundrát <jan.kundrat@cesnet.cz>
diff --git a/board/czechlight_beaglebone/genimage.cfg b/board/czechlight_beaglebone/genimage.cfg
new file mode 100644
index 0000000..a058ce9
--- /dev/null
+++ b/board/czechlight_beaglebone/genimage.cfg
@@ -0,0 +1,32 @@
+image boot.vfat {
+	vfat {
+		file MLO {
+			image = "barebox-am33xx-beaglebone-mlo.img"
+		}
+		file barebox.bin {
+			image = "barebox-am33xx-beaglebone.img"
+		}
+		files = {
+			"barebox.env",
+			"zImage"
+		}
+	}
+	size = 32M
+}
+
+image sdcard.img {
+	hdimage {
+	}
+
+	partition boot {
+		partition-type = 0xC
+		in-partition-table = "yes"
+		bootable = "true"
+		image = "boot.vfat"
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+	}
+}