diff -Nur linux-2.6.24.vanilla/drivers/rtc/rtc-sa1100.c linux-2.6.24_rtc/drivers/rtc/rtc-sa1100.c
--- linux-2.6.24.vanilla/drivers/rtc/rtc-sa1100.c	2008-01-24 23:58:37.000000000 +0100
+++ linux-2.6.24_rtc/drivers/rtc/rtc-sa1100.c	2008-03-24 13:49:40.000000000 +0100
@@ -79,7 +79,10 @@
 
 	rtsr = RTSR;
 	/* clear interrupt sources */
-	RTSR = 0;
+	RTSR &= ~RTSR_HZE; //RTSR = 0; is not possible and does not work
+	RTSR &= ~RTSR_HZ;
+	RTSR &= ~RTSR_ALE;
+	RTSR &= ~RTSR_AL;
 	RTSR = (RTSR_AL | RTSR_HZ) & (rtsr >> 2);
 
 	/* clear alarm interrupt if it has occurred */
@@ -155,6 +158,20 @@
 {
 	int ret;
 
+	/*
+	 * On some devices RTSR is set to some value but it must be set to 0.
+	 * We have to set RTSR to 0 and OIER/OSSR to default. This should not be
+	 * necessary here but it is.
+	 */
+	spin_lock_irq(&sa1100_rtc_lock);
+	RTSR &= ~RTSR_HZE;
+	RTSR &= ~RTSR_HZ;
+	RTSR &= ~RTSR_ALE;
+	RTSR &= ~RTSR_AL;
+	OIER &= ~OIER_E1;
+	OSSR = OSSR_M1;
+	spin_unlock_irq(&sa1100_rtc_lock);
+
 	ret = request_irq(IRQ_RTC1Hz, sa1100_rtc_interrupt, IRQF_DISABLED,
 				"rtc 1Hz", dev);
 	if (ret) {
@@ -186,7 +203,10 @@
 static void sa1100_rtc_release(struct device *dev)
 {
 	spin_lock_irq(&sa1100_rtc_lock);
-	RTSR = 0;
+	RTSR &= ~RTSR_HZE; //RTSR = 0; is not possible and does not work
+	RTSR &= ~RTSR_HZ;
+	RTSR &= ~RTSR_ALE;
+	RTSR &= ~RTSR_AL;
 	OIER &= ~OIER_E1;
 	OSSR = OSSR_M1;
 	spin_unlock_irq(&sa1100_rtc_lock);
@@ -339,6 +359,19 @@
 
 	platform_set_drvdata(pdev, rtc);
 
+	/*
+	 * On some devices RTSR is set to some value but it must be set to 0.
+	 * We have to set RTSR to 0 and OIER/OSSR to default.
+	 */
+	spin_lock_irq(&sa1100_rtc_lock);
+	RTSR &= ~RTSR_HZE;
+	RTSR &= ~RTSR_HZ;
+	RTSR &= ~RTSR_ALE;
+	RTSR &= ~RTSR_AL;
+	OIER &= ~OIER_E1;
+	OSSR = OSSR_M1;
+	spin_unlock_irq(&sa1100_rtc_lock);
+
 	return 0;
 }