From: SeokYeon Hwang <syeon.hwang@samsung.com>
Date: Mon, 12 Jan 2015 06:47:06 +0000 (+0900)
Subject: initramfs: cleaned up
X-Git-Tag: submit/tizen/20160422.055611~1^2~97
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=refs%2Fchanges%2F85%2F33485%2F1;p=sdk%2Femulator%2Femulator-kernel.git

initramfs: cleaned up

Using devtmpfs for populating /dev.
Removed pre-made dev nodes.
Removed pre-linked binaries to busybox.

Change-Id: I10be92fe41da52d3b8b05edbffd2a798a199b9ca
Signed-off-by: SeokYeon Hwang <syeon.hwang@samsung.com>
---

diff --git a/ramfs/busybox b/ramfs/busybox
index dfe2d8f3eb11..e33255438e5e 100755
Binary files a/ramfs/busybox and b/ramfs/busybox differ
diff --git a/ramfs/init b/ramfs/init
index 7e0cd17b3e57..5b8ed28f931a 100644
--- a/ramfs/init
+++ b/ramfs/init
@@ -1,19 +1,35 @@
-#!/bin/sh
+#!/bin/busybox sh
 # SeokYeon Hwang (syeon.hwang@samsung.com)
 
-COLOR='\033[1;34m' # light blue
-NO_COLOR='\033[0m'
+COLOR_BLUE="\033[1;34m" # light blue
+COLOR_GREEN="\033[1;32m" # light green
+COLOR_RED="\033[1;31m" # light red
+NO_COLOR="\033[0m"
 
-echo -e "${COLOR}Mount proc filesystem${NO_COLOR}"
-mount -t proc proc /proc
+NEW_ROOT="/new_root"
 
-echo -e "${COLOR}Mount emulator image${NO_COLOR}"
-mount -o rw /dev/vda /new_root
+/bin/busybox mkdir -p /dev
+/bin/busybox mount -t devtmpfs devtmpfs /dev
 
-echo -e "${COLOR}Mount dev filesystem${NO_COLOR}"
-/bin/mkdir -p /new_root/dev
-/bin/mount -t devtmpfs devtmpfs /new_root/dev
-/bin/mkdir -p /new_root/sys
+exec &> /dev/console
 
-echo -e "${COLOR}Switching root${NO_COLOR}"
-exec switch_root -c /dev/console /new_root /sbin/init
+# for debugging...
+#/bin/busybox ls -la /dev >> /dev/console
+
+echo -e "${COLOR_GREEN}Preparing...${NO_COLOR}"
+/bin/busybox mkdir -p /proc
+/bin/busybox mount -t proc proc /proc
+/bin/busybox mkdir -p /sys
+/bin/busybox mount -t sysfs sys /sys
+
+# mount root...
+echo -e "${COLOR_GREEN}Mount image...${NO_COLOR}"
+/bin/busybox mount -o rw /dev/vda $NEW_ROOT
+
+# clean up...
+/bin/busybox umount /proc
+/bin/busybox umount /sys
+
+# switch root...
+echo -e "${COLOR_GREEN}Switching root...${NO_COLOR}"
+exec /bin/busybox switch_root -c /dev/console $NEW_ROOT /sbin/init
diff --git a/ramfs/initramfs b/ramfs/initramfs
index 0a3a2b7f6419..9541a8661679 100755
--- a/ramfs/initramfs
+++ b/ramfs/initramfs
@@ -1,31 +1,14 @@
 # SeokYeon Hwang (syeon.hwang@samsung.com)
 
-dir /dev 0755 0 0
-
-nod /dev/console 0600 0 0 c 5 1
-nod /dev/zero 0600 0 0 c 1 5
-nod /dev/mem 0600 0 0 c 1 1
-nod /dev/vda 0600 0 0 b 254 0
+# init script
+file /init ramfs/init 0755 0 0
 
-dir /root 0700 0 0
-dir /sbin 0755 0 0
+# busybox
 dir /bin 0755 0 0
-dir /new_root 0755 0 0
-dir /proc 0755 0 0
-
-file /sbin/v86d ramfs/v86d 0755 0 0
-file /init ramfs/init 0755 0 0
 file /bin/busybox ramfs/busybox 0755 0 0
 
-slink /bin/sh /bin/busybox 0755 0 0
-slink /sbin/init /bin/busybox 0755 0 0
-slink /bin/mount /bin/busybox 0755 0 0
-slink /bin/switch_root /bin/busybox 0755 0 0
-slink /bin/mkdir /bin/busybox 0755 0 0
-
-#slink /bin/insmod /bin/busybox 0755 0 0
-#slink /bin/cat /bin/busybox 0755 0 0
-#slink /bin/cp /bin/busybox 0755 0 0
-#slink /bin/mknod /bin/busybox 0755 0 0
-#slink /bin/ln /bin/busybox 0755 0 0
+# vesafb user driver
+# We don't use vesafb anymore, but it is useful for debugging.
+dir /sbin 0755 0 0
+file /sbin/v86d ramfs/v86d 0755 0 0