meta-digi-dey: Add a dey-image-tiny initramfs image.

To boot from TFTP/NFS you need something like:

    setenv uimage uImage-ccimx6sbc
    setenv initrdimg dey-image-tiny-initramfs-ccimx6sbc.rootfs.initramfs
    setenv fdt_file uImage-imx6q-ccimx6sbc.dtb
    setenv initrdaddr 0x22000000
    setenv bootargs console=ttymxc3,115200 rdinit=/sbin/init
    saveenv

    tftp $loadaddr $uimage
    tftp $initrdaddr $initrdimg
    tftp $fdt_addr $fdt_file

    bootm $loadaddr $initrdaddr $fdt_addr

Signed-off-by: Alex Gonzalez <alex.gonzalez@digi.com>

meta-digi-dey/recipes-core/images/dey-image-tiny-initramfs.bb

@@ -0,0 +1,12 @@
+#
+# Copyright (C) 2014 Digi International.
+#
+DESCRIPTION = "DEY busybox only based initramfs image."
+
+include dey-image-tiny.bb
+
+export IMAGE_BASENAME = "dey-image-tiny-initramfs"
+
+IMAGE_FSTYPES = "${INITRAMFS_FSTYPES}"
+IMAGE_FSTYPES_append = " rootfs.initramfs"
+

meta-digi-dey/recipes-core/initscripts/initscripts-1.0/devtmpfs.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+if grep -q devtmpfs /proc/filesystems; then
+	# mount the devtmpfs on /dev, if not already done
+	LANG=C awk '$2 == "/dev" && ($3 == "devtmpfs") { exit 1 }' /proc/mounts && {
+	mount -n -o mode=0755 -t devtmpfs none "/dev"
+	}
+fi

meta-digi-dey/recipes-core/initscripts/initscripts_1.0.bbappend

@@ -2,8 +2,11 @@
 
 FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}-${PV}:"
 
-SRC_URI += "file://device_table.txt"
+SRC_URI += "file://device_table.txt \
+	    file://devtmpfs.sh"
 
 do_install_append() {
+	install -m 755 ${WORKDIR}/devtmpfs.sh ${D}${sysconfdir}/init.d/devtmpfs.sh
+	update-rc.d -r ${D} devtmpfs.sh start 03 S .
 	install -m 0755 ${WORKDIR}/device_table.txt ${D}${sysconfdir}/device_table
 }