diff --git a/target/linux/mvebu/patches-4.14/421-rtc-initialize.patch b/target/linux/mvebu/patches-4.14/421-rtc-initialize.patch
new file mode 100644
index 0000000000..47a5acc70d
--- /dev/null
+++ b/target/linux/mvebu/patches-4.14/421-rtc-initialize.patch
@@ -0,0 +1,74 @@
+Some boards like the Turris Omnia have an RTC chip that does not get
+initialized. Initializing the RTC at the driver level helps get rid of
+bootloader hacks that write special register values.
+
+--- a/drivers/rtc/rtc-armada38x.c
++++ b/drivers/rtc/rtc-armada38x.c
+@@ -30,6 +30,9 @@
+ #define RTC_IRQ_FREQ_1HZ	    BIT(2)
+ #define RTC_CCR		    0x18
+ #define RTC_CCR_MODE		    BIT(15)
++#define RTC_CCR_NORMAL_PPB	    0x2000
++#define RTC_TEST_CONF		    0x1c
++#define RTC_TEST_CONF_MASK	    0xff
+ 
+ #define RTC_TIME	    0xC
+ #define RTC_ALARM1	    0x10
+@@ -91,6 +94,7 @@ struct armada38x_rtc_data {
+ 	void (*clear_isr)(struct armada38x_rtc *rtc);
+ 	void (*unmask_interrupt)(struct armada38x_rtc *rtc);
+ 	u32 alarm;
++	void (*init_rtc)(struct armada38x_rtc *rtc);
+ };
+ 
+ /*
+@@ -202,6 +206,23 @@ static void armada38x_unmask_interrupt(s
+ 	writel(val | SOC_RTC_ALARM1_MASK, rtc->regs_soc + SOC_RTC_INTERRUPT);
+ }
+ 
++static void armada38x_rtc_init(struct armada38x_rtc *rtc)
++{
++	u32 reg;
++
++	/* Test RTC test configuration register bits [7:0] */
++	reg = readl(rtc->regs + RTC_TEST_CONF);
++	/* If bits [7:0] are non-zero, assume RTC was uninitialized */
++	if (reg & RTC_TEST_CONF_MASK) {
++		rtc_delayed_write(0, rtc, RTC_TEST_CONF);
++		rtc_delayed_write(0, rtc, RTC_TIME);
++		rtc_delayed_write((RTC_STATUS_ALARM1 | RTC_STATUS_ALARM2),
++				rtc, RTC_STATUS);
++		rtc_delayed_write(RTC_CCR_NORMAL_PPB, rtc, RTC_CCR);
++	}
++	return;
++}
++
+ static void armada8k_clear_isr(struct armada38x_rtc *rtc)
+ {
+ 	writel(RTC_8K_ALARM2, rtc->regs_soc + RTC_8K_ISR);
+@@ -464,6 +485,7 @@ static const struct armada38x_rtc_data a
+ 	.clear_isr = armada38x_clear_isr,
+ 	.unmask_interrupt = armada38x_unmask_interrupt,
+ 	.alarm = ALARM1,
++	.init_rtc = armada38x_rtc_init,
+ };
+ 
+ static const struct armada38x_rtc_data armada8k_data = {
+@@ -558,6 +580,17 @@ static __init int armada38x_rtc_probe(st
+ 		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
+ 		return ret;
+ 	}
++
++	/*
++	 * Try to detect if RTC is in uninitialized state.
++	 * It is not definitive to know if the RTC is in an uninialized state or not,
++	 * but the following call will read some bits in the RTC unit and guess if
++	 * if it's in that state, and accordingly set it to sane default values.
++	 */
++	if (rtc->data->init_rtc) {
++		rtc->data->init_rtc(rtc);
++	}
++
+ 	return 0;
+ }
+