Jetson-TX1: Add ability to mount root via NFS

Added new init script that can also mount NFS root. The original init
script from meta-tegra layer can only mount from local disk partitions,
so an enhanced version of the script was written. While primarily
written for RTA testing, end users may find the ability to mount from
NFS useful.

Task-number: QTBUG-61190
Change-Id: I76af558f2a528862ca1f88dcb4958a5686b508f5
Reviewed-by: Samuli Piippo <samuli.piippo@qt.io>

2 files changed, 77 insertions, 0 deletions

diff --git a/meta-tegra-extras/recipes/initscripts/tegra210-minimal-init/init-boot.sh b/meta-tegra-extras/recipes/initscripts/tegra210-minimal-init/init-boot.sh
new file mode 100644
index 0000000..3e43b60
--- /dev/null
+++ b/meta-tegra-extras/recipes/initscripts/tegra210-minimal-init/init-boot.sh
@@ -0,0 +1,44 @@
+#!/bin/sh
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+mount -t proc proc /proc
+mount -t devtmpfs none /dev
+mount -t sysfs sysfs /sys
+
+rootdev=""
+opt="rw"
+wait=""
+nfsroot=""
+nfsopts=""
+for bootarg in `cat /proc/cmdline`; do
+    case "$bootarg" in
+    root=*) rootdev="${bootarg##root=}" ;;
+    nfsroot=*)
+            nfsroot=$(echo ${bootarg##nfsroot=} | cut -d ',' -f 1)
+            nfsopts=$(echo ${bootarg##nfsroot=} | cut -d ',' -f 2-)
+            nfsopts=${nfsopts##${nfsroot}}
+            ;;
+    ro) opt="ro" ;;
+    rootwait) wait="yes" ;;
+    esac
+done
+if [ -n "$wait" -a ! -b "${rootdev}" ]; then
+    echo "Waiting for ${rootdev}..."
+    count=0
+    while [ $count -lt 25 ]; do
+    test -b "${rootdev}" && break
+    sleep 0.1
+    count=`expr $count + 1`
+    done
+fi
+echo "Mounting ${rootdev}..."
+if [ "$rootdev" = "/dev/nfs" ]; then
+    echo "Using NFS to boot..."
+    mount -t nfs -o "${opt},${nfsopts}" "${nfsroot}" /mnt || exec sh
+else
+    mount -t ext4 -o "$opt" "${rootdev}" /mnt || exec sh
+fi
+echo "Switching to rootfs on ${rootdev}..."
+mount --move /sys  /mnt/sys
+mount --move /proc /mnt/proc
+mount --move /dev  /mnt/dev
+exec switch_root /mnt /sbin/init
diff --git a/meta-tegra-extras/recipes/initscripts/tegra210-minimal-init_%.bbappend b/meta-tegra-extras/recipes/initscripts/tegra210-minimal-init_%.bbappend
new file mode 100644
index 0000000..788524a
--- /dev/null
+++ b/meta-tegra-extras/recipes/initscripts/tegra210-minimal-init_%.bbappend
@@ -0,0 +1,33 @@
+############################################################################
+##
+## Copyright (C) 2017 The Qt Company Ltd.
+## Contact: https://www.qt.io/licensing/
+##
+## This file is part of the Boot to Qt meta layer.
+##
+## $QT_BEGIN_LICENSE:GPL$
+## Commercial License Usage
+## Licensees holding valid commercial Qt licenses may use this file in
+## accordance with the commercial license agreement provided with the
+## Software or, alternatively, in accordance with the terms contained in
+## a written agreement between you and The Qt Company. For licensing terms
+## and conditions see https://www.qt.io/terms-conditions. For further
+## information use the contact form at https://www.qt.io/contact-us.
+##
+## GNU General Public License Usage
+## Alternatively, this file may be used under the terms of the GNU
+## General Public License version 3 or (at your option) any later version
+## approved by the KDE Free Qt Foundation. The licenses are as published by
+## the Free Software Foundation and appearing in the file LICENSE.GPL3
+## included in the packaging of this file. Please review the following
+## information to ensure the GNU General Public License requirements will
+## be met: https://www.gnu.org/licenses/gpl-3.0.html.
+##
+## $QT_END_LICENSE$
+##
+############################################################################
+
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+SRC_URI += "\
+    file://init-boot.sh \
+    "