Patch for U-Boot to allow access to RTC clock from non-secure mode on Allwinner A31s to fix /dev/rtc in Linux

a31s-allow-access-to-rtc-from-non-secure-mode.diff

diff --git a/arch/arm/cpu/armv7/sunxi/board.c b/arch/arm/cpu/armv7/sunxi/board.c
index f01846e..cd06c72 100644
--- a/arch/arm/cpu/armv7/sunxi/board.c
+++ b/arch/arm/cpu/armv7/sunxi/board.c
@@ -106,6 +106,10 @@ void s_init(void)
 	 * access gets messed up (seems cache related) */
 	setbits_le32(SUNXI_SRAMC_BASE + 0x44, 0x1800);
 #endif
+#if defined CONFIG_MACH_SUN6I
+	/* Allow access to RTC clock from non-secure mode */
+	writel(2, SUNXI_TZPC_BASE + 0x8);
+#endif
 #if defined CONFIG_MACH_SUN6I || \
     defined CONFIG_MACH_SUN7I || \
     defined CONFIG_MACH_SUN8I