diff --git a/lib/bsp/standalone/src/changelog.txt b/lib/bsp/standalone/src/changelog.txt
index 7bed6031..9221f19c 100755
--- a/lib/bsp/standalone/src/changelog.txt
+++ b/lib/bsp/standalone/src/changelog.txt
@@ -189,4 +189,7 @@
  * 4.2 pkp   07/21/14  Included xil_types.h file in xil_mmu.h which had contained a function 
  * 		       containing type def u32 defined in xil_types.g to resolve issue of 
  *		       CR#805869
- *****************************************************************************************/
+ * 4.2 pkp   08/04/14  Removed unimplemented nanosleep routine from cortexa9/usleep.c as 
+ *		       it is not possible to generate timer in nanosecond due to limited
+ *		       cpu frequency
+ ******************************************************************************************/
diff --git a/lib/bsp/standalone/src/cortexa9/sleep.h b/lib/bsp/standalone/src/cortexa9/sleep.h
index ed7d8118..337fc571 100755
--- a/lib/bsp/standalone/src/cortexa9/sleep.h
+++ b/lib/bsp/standalone/src/cortexa9/sleep.h
@@ -37,7 +37,6 @@
 extern "C" {
 #endif
 
-void nanosleep(unsigned int nanoseconds);
 int usleep(unsigned int useconds);
 int sleep(unsigned int seconds);
 
diff --git a/lib/bsp/standalone/src/cortexa9/usleep.c b/lib/bsp/standalone/src/cortexa9/usleep.c
index 21de591c..a8cddf0c 100755
--- a/lib/bsp/standalone/src/cortexa9/usleep.c
+++ b/lib/bsp/standalone/src/cortexa9/usleep.c
@@ -44,6 +44,9 @@
 * ----- -------- -------- -----------------------------------------------
 * 1.00a ecm/sdm  11/11/09 First release
 * 3.07a sgd      07/05/12 Upadted micro sleep function to make use Global Timer
+* 4.2	pkp		 08/04/14 Removed unimplemented nanosleep routine as it is not
+*						  possible to generate timer in nanosecond due to
+*						  limited cpu frequency
 * </pre>
 *
 ******************************************************************************/
@@ -58,23 +61,6 @@
 /* Global Timer is always clocked at half of the CPU frequency */
 #define COUNTS_PER_USECOND  (XPAR_CPU_CORTEXA9_CORE_CLOCK_FREQ_HZ / (2*1000000))
 
-/*****************************************************************************/
-/**
-*
-* This is not implemented .
-*
-* @param	nanoseconds
-*
-* @return	None
-*
-* @note		None.
-*
-****************************************************************************/
-void nanosleep(unsigned int nanoseconds){
-	/* not implemented */
-	(void)nanoseconds;
-}
-
 /*****************************************************************************/
 /**
 *