initramfs-framework: provides a modular initramfs

Provides the API and modules for a modular initramfs. The currently
included modules are:

 * initramfs-module-debug adds support to dynamic debugging of
   initramfs using bootparams

 * initramfs-module-udev: enables udev usage

 * initramfs-module-mdev: enables mdev usage

 * initramfs-module-e2fs: adds support for ext4, ext3 and ext2
   filesystems

(From OE-Core rev: 7b69ad2167a1f0e57db82817b98a0cbcb70a0dd3)

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/meta/recipes-core/initrdscripts/initramfs-framework/mdev b/meta/recipes-core/initrdscripts/initramfs-framework/mdev
new file mode 100644
index 0000000000..a5df1d717a
--- /dev/null
+++ b/meta/recipes-core/initrdscripts/initramfs-framework/mdev
@@ -0,0 +1,30 @@
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+mdev_enabled() {
+        if [ ! -e /sbin/mdev ]; then
+                debug "/sbin/mdev doesn't exist"
+                return 1
+        fi
+
+        return 0
+}
+
+mdev_run() {
+        # setup the environment
+        mount -t tmpfs tmpfs /dev
+
+        mkdir -m 1777 /dev/shm
+
+        mkdir -m 0755 /dev/pts
+        mount -t devpts devpts /dev/pts
+
+        echo /sbin/mdev > /proc/sys/kernel/hotplug
+        mdev -s
+
+        # load modules for devices
+        find /sys -name modalias | while read m; do
+                load_kernel_module $(cat $m)
+        done
+}