diff --git a/configs/README.txt b/configs/README.txt
index 6cb302d245..c18bde3210 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -607,6 +607,23 @@ defconfig -- This is a configuration file similar to the Linux
 		  option will enable a limited form of memory mapping that is
 		  implemented by copying whole files into memory.
 
+	RTC
+
+		CONFIG_RTC - Enables general support for a hardware RTC. Specific
+		  architectures may require other specific settings.
+		CONFIG_RTC_HIRES - The typical RTC keeps time to resolution of 1
+		  second, usually supporting a 32-bit time_t value.  In this case,
+		  the RTC is used to "seed" the normal NuttX timer and the
+		  NuttX timer provides for higher resoution time. If CONFIG_RTC_HIRES
+		  is enabled in the NuttX configuration, then the RTC provides higher
+		  resolution time and completely replaces the system timer for purpose of
+		  date and time.
+		  CONFIG_RTC_FREQUENCY - If CONFIG_RTC_HIRES is defined, then the
+		  frequency of the high resolution RTC must be provided.  If CONFIG_RTC_HIRES
+		  is not defined, CONFIG_RTC_FREQUENCY is assumed to be one.
+		CONFIG_RTC_ALARM - Enable if the RTC hardware supports setting of an alarm. 
+		  A callback function will be executed when the alarm goes off
+
 	SPI driver
 
 		CONFIG_SPI_OWNBUS - Set if there is only one active device
diff --git a/configs/stm3210e-eval/README.txt b/configs/stm3210e-eval/README.txt
index 3f260e9a83..f82c2243b6 100755
--- a/configs/stm3210e-eval/README.txt
+++ b/configs/stm3210e-eval/README.txt
@@ -14,6 +14,7 @@ Contents
   - DFU
   - LEDs
   - Temperature Sensor
+  - RTC
   - STM3210E-EVAL-specific Configuration Options
   - Configurations
 
@@ -264,6 +265,38 @@ commands enumerated in include/nuttx/sensors/lm75.h.  Also read the descriptions
 of the stm32_lm75initialize() and stm32_lm75attach() interfaces in the
 arch/board/board.h file (sames as configs/stm3210e-eval/include/board.h).
 
+RTC
+===
+
+  The STM32 RTC may configured using the following settings.
+
+    CONFIG_RTC - Enables general support for a hardware RTC. Specific
+      architectures may require other specific settings.
+    CONFIG_RTC_HIRES - The typical RTC keeps time to resolution of 1
+      second, usually supporting a 32-bit time_t value.  In this case,
+      the RTC is used to "seed" the normal NuttX timer and the
+      NuttX timer provides for higher resoution time. If CONFIG_RTC_HIRES
+      is enabled in the NuttX configuration, then the RTC provides higher
+      resolution time and completely replaces the system timer for purpose of
+      date and time.
+      CONFIG_RTC_FREQUENCY - If CONFIG_RTC_HIRES is defined, then the
+      frequency of the high resolution RTC must be provided.  If CONFIG_RTC_HIRES
+      is not defined, CONFIG_RTC_FREQUENCY is assumed to be one.
+    CONFIG_RTC_ALARM - Enable if the RTC hardware supports setting of an alarm. 
+      A callback function will be executed when the alarm goes off
+
+  In hi-res mode, the STM32 RTC operates only at 16384Hz.  Overflow interrupts
+  are handled when the 32-bit RTC counter overflows every 3 days and 43 minutes.
+  A BKP register is incremented on each overflow interrupt creating, effectively,
+  a 48-bit RTC counter.
+
+  In the lo-res mode, the RTC operates at 1Hz.  Overflow interrupts are not handled
+  (because the next overflow is not expected until the year 2106.
+
+   WARNING:  Overflow interrupts are lost whenever the STM32 is powered down.  The
+   overflow interrupt may be lost even if the STM32 is powered down only momentarily.
+   Therefore hi-res solution is only useful in systems where the power is always on.
+
 STM3210E-EVAL-specific Configuration Options
 ============================================
 
diff --git a/configs/vsn/src/sif.c b/configs/vsn/src/sif.c
index 3c304a3b23..e185d8d0df 100644
--- a/configs/vsn/src/sif.c
+++ b/configs/vsn/src/sif.c
@@ -712,7 +712,7 @@ int sif_main(int argc, char *argv[])
     fprintf(stderr, "%s:\tinit\n\tgpio\tA B\n\tpwr\tval\n", argv[0]);
     
     struct timespec t_active;
-    clock_gettime(CLOCK_REALTIME, &t_active);
+    clock_gettime(CLOCK_ACTIVETIME, &t_active);
     
     fprintf(stderr, "rtc time = %u, active = %u / %u, time / systick = %u / %u\n", 
         up_rtc_time(), t_active.tv_sec, t_active.tv_nsec,