tiny-init: Mount devtmpfs manually

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

(From meta-yocto rev: b0ae9ca7078ec57fe21ccd8a14302a075ca07aa3)

Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-yocto/recipes-core/tiny-init/files/init

@@ -4,8 +4,10 @@
 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
-mknod /dev/ptmx c 5 2
 mkdir /dev/pts
 mount none -t devpts /dev/pts
 

meta-yocto/recipes-core/tiny-init/tiny-init.bb

@@ -3,7 +3,7 @@ DESCRIPTION = "Basic init system for poky-tiny"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
 
-PR = "r1"
+PR = "r2"
 
 RDEPENDS_${PN} = "busybox"