fri2: Add tiny-init bbappend for devtmpfs and console

When using an initramfs, the default for poky-tiny, the kernel cannot
automatically mount devtmpfs. Ensure it is mounted. This eliminates the
need to create the ptmx device.

Signed-off-by: Darren Hart <dvhart@linux.intel.com>

meta-fri2/recipes-core/tiny-init/tiny-init.bbappend

@@ -0,0 +1,6 @@
+# Update the init script for the tiny image to manually mount devtmpfs and
+# ensure the ttyPCH1 device is available for the console.
+
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+ 
+PRINC := "${@int(PRINC) + 1}"

meta-fri2/recipes-core/tiny-init/tiny-init/init

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+# Mount the Linux kernel virtual filesystems
+mount none -t proc /proc
+mount none -t sysfs /sys
+
+# Ensure devtmpfs is mounted, it must be done manually with initramfs
+mount none -t devtmpfs /dev
+
+# Setup PTY infrastructure
+mkdir /dev/pts
+mount none -t devpts /dev/pts
+
+ifup lo
+
+# Allow for distro or local customizations
+if [ -f /etc/rc.local ] ; then
+	source /etc/rc.local
+fi
+
+# Become session leader and try to find a real tty (e.g. ttyS0)
+while true; do
+	setsid cttyhack sh
+	echo "Console sh exited with $?, respawning..."
+	sleep 1
+done