2011-03-07 Joel Sherrill <joel.sherrilL@OARcorp.com>

	PR 1756/bsps
	* timer/timer.c: Retry on timer calibration loop failure.

2 files changed, 28 insertions, 8 deletions

diff --git a/c/src/lib/libbsp/i386/pc386/ChangeLog b/c/src/lib/libbsp/i386/pc386/ChangeLog
index bdc2672c28..7cc2102d4d 100644
--- a/c/src/lib/libbsp/i386/pc386/ChangeLog
+++ b/c/src/lib/libbsp/i386/pc386/ChangeLog
@@ -1,3 +1,8 @@
+2011-03-07	Joel Sherrill <joel.sherrilL@OARcorp.com>
+
+	PR 1756/bsps
+	* timer/timer.c: Retry on timer calibration loop failure.
+
 2011-02-02	Ralf Corsépius <ralf.corsepius@rtems.org>
 
 	* configure.ac: Require autoconf-2.68, automake-1.11.1.
diff --git a/c/src/lib/libbsp/i386/pc386/timer/timer.c b/c/src/lib/libbsp/i386/pc386/timer/timer.c
index ff3eb0040e..29a12119b4 100644
--- a/c/src/lib/libbsp/i386/pc386/timer/timer.c
+++ b/c/src/lib/libbsp/i386/pc386/timer/timer.c
@@ -333,13 +333,19 @@ Calibrate_loop_1ms(void)
   unsigned int targetClockBits, currentClockBits;
   unsigned int slowLoopGranularity, fastLoopGranularity;
   rtems_interrupt_level  level;
+  int retries = 0;
 
+  rtems_interrupt_disable(level);
+
+retry:
+  if ( ++retries >= 5 ) {
+    printk( "Calibrate_loop_1ms: too many attempts. giving up!!\n" );
+    while (1);
+  }
 #ifdef DEBUG_CALIBRATE
   printk("Calibrate_loop_1ms is starting,  please wait (but not too long.)\n");
 #endif
   targetClockBits = US_TO_TICK(1000);
-
-  rtems_interrupt_disable(level);
   /*
    * Fill up the cache to get a correct offset
    */
@@ -383,8 +389,11 @@ Calibrate_loop_1ms(void)
   fastLoop (10000);
   res = readTimer0() - offset;
   if (res < emptyCall) {
-     printk("Problem #1 in offset computation in Calibrate_loop_1ms in file libbsp/i386/pc386/timer/timer.c\n");
-    while (1);
+    printk(
+      "Problem #1 in offset computation in Calibrate_loop_1ms "
+        " in file libbsp/i386/pc386/timer/timer.c\n"
+    );
+    goto retry;
   }
   fastLoopGranularity = (res - emptyCall) / 10000;
   /*
@@ -394,14 +403,20 @@ Calibrate_loop_1ms(void)
   slowLoop(10);
   res = readTimer0();
   if (res < offset + emptyCall) {
-     printk("Problem #2 in offset computation in Calibrate_loop_1ms in file libbsp/i386/pc386/timer/timer.c\n");
-    while (1);
+    printk(
+      "Problem #2 in offset computation in Calibrate_loop_1ms "
+        " in file libbsp/i386/pc386/timer/timer.c\n"
+    );
+    goto retry;
   }
   slowLoopGranularity = (res - offset - emptyCall)/ 10;
 
   if (slowLoopGranularity == 0) {
-    printk("Problem #3 in Calibrate_loop_1ms in file libbsp/i386/pc386/timer/timer.c\n");
-    while (1);
+    printk(
+      "Problem #3 in offset computation in Calibrate_loop_1ms "
+        " in file libbsp/i386/pc386/timer/timer.c\n"
+    );
+    goto retry;
   }
 
   targetClockBits += offset;