From: Sami Mujawar <sami.mujawar@xxxxxxx>
Some software drivers check the VRT bit (BIT7) of Register D before
using the MC146818 RTC. Initialized the VRT bit in rtc__init() to
indicate that the RAM and time contents are valid.
Signed-off-by: Sami Mujawar <sami.mujawar@xxxxxxx>
Signed-off-by: Julien Thierry <julien.thierry@xxxxxxx>
Reviewed-by: Andre Przywara <andre.przywara@xxxxxxx>
---
hw/rtc.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/hw/rtc.c b/hw/rtc.c
index 0649b5d..c1fa72f 100644
--- a/hw/rtc.c
+++ b/hw/rtc.c
@@ -25,6 +25,11 @@
#define RTC_REG_C 0x0C
#define RTC_REG_D 0x0D
+/*
+ * Register D Bits
+ */
+#define RTC_REG_D_VRT (1 << 7)
+
struct rtc_device {
u8 cmos_idx;
u8 cmos_data[128];
@@ -140,6 +145,9 @@ int rtc__init(struct kvm *kvm)
return r;
}
+ /* Set the VRT bit in Register D to indicate valid RAM and time */
+ rtc.cmos_data[RTC_REG_D] = RTC_REG_D_VRT;
+
return r;
}
dev_init(rtc__init);
--
1.9.1
