--- etc/init.d/hwclock.sh	2014/01/07 03:04:06	1.1
+++ etc/init.d/hwclock.sh	2014/01/07 03:12:31
@@ -38,6 +38,28 @@ HCTOSYS_DEVICE=rtc0
 # potential inconsistency at startup.
 unset TZ
 
+init_rtc_device() {
+    [-e /dev/rtc0 ] && return 0;
+
+    #load i2c and RTC kernel modules
+    modprobe i2c-dev
+    modprobe rtc-ds1307
+
+    #iterate over every i2c bus as we're supporting Raspberry Pi rev. 1 and 2
+    #(different I2C busses on GPIO header!)
+    for bus in $(ls -d /sys/bus/i2c/devices/i2c-*)
+    do
+	echo ds1307 0x68 >> $bus/new_device;
+	if [ -e /dev/rtc0 ]
+	then
+	    log_action_msg "RTC found on bus `cat $bus/name`"
+	    break # RTC found, bail out of the loop
+	else
+	    echo 0x68 >> $bus/delete_device
+	fi
+    done
+}
+
 hwclocksh()
 {
     [ ! -x /sbin/hwclock ] && return 0
@@ -61,9 +83,11 @@ hwclocksh()
 	        printf "0.0 0 0.0\n0\nUTC" > /etc/adjtime
 	    fi
 
-	    if [ -d /run/udev ] || [ -d /dev/.udev ]; then
-		return 0
-	    fi
+	    init_rtc_device
+	    # Raspberry Pi doesn't have udev detactableRTC
+	    #if [ -d /run/udev ] || [ -d /dev/.udev ]; then
+	    #	return 0
+	    #fi
 
 	    if [ "$HWCLOCKACCESS" != no ]; then
 		log_action_msg "Setting the system clock"
--- etc/modprobe.d/raspi-blacklist.conf	2014/01/07 03:17:04	1.1
+++ etc/modprobe.d/raspi-blacklist.conf	2014/01/07 03:17:53
@@ -1,4 +1,4 @@
 # blacklist spi and i2c by default (many users don't need them)
 
 blacklist spi-bcm2708
-blacklist i2c-bcm2708
+#blacklist i2c-bcm2708	// for RTC
--- /dev/null	1969-12-31 16:00:06.660000000 -0800
+++ etc/cron.hourly/sync-hwclock	2014-01-06 19:52:00.537478011 -0800
@@ -0,0 +1,8 @@
+#!/bin/sh
+#
+# Simple cron script - update and synchronize hardware clock to NTP
+# only if NTP is available.
+
+if ntptrace >/dev/null 2>&1; then
+  hwclock -w
+fi