From f7edd7a31c3dc80158d4334717c1380d36e0b55a Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Thu, 13 Jun 2013 16:18:25 -0600
Subject: [PATCH] SAM3/4:  Loop counter for PLL delay must be volatile or it
 may get optimized away

---
 arch/arm/src/sam34/sam3u_clockconfig.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/src/sam34/sam3u_clockconfig.c b/arch/arm/src/sam34/sam3u_clockconfig.c
index 71d918b8c2..500ed28391 100644
--- a/arch/arm/src/sam34/sam3u_clockconfig.c
+++ b/arch/arm/src/sam34/sam3u_clockconfig.c
@@ -151,7 +151,8 @@ static inline void sam_supcsetup(void)
 
 static void sam_pmcwait(uint32_t bit)
 {
-  uint32_t delay;
+  volatile uint32_t delay;
+
   for (delay = 0;
        (getreg32(SAM_PMC_SR) & bit) == 0 && delay < UINT32_MAX;
        delay++);