Index: firmware/target/coldfire/pcf50606-coldfire.c
===================================================================
--- firmware/target/coldfire/pcf50606-coldfire.c	(revision 14826)
+++ firmware/target/coldfire/pcf50606-coldfire.c	(working copy)
@@ -87,7 +87,7 @@
 inline void pcf50606_i2c_start(void)
 {
 #ifdef USE_ASM
-    asm (
+    asm volatile (
         "not.l   %[sdab]              \n" /* SDA_HI_IN */
         "and.l   %[sdab],(8,%[sdard]) \n"
         "not.l   %[sdab]              \n"
@@ -137,7 +137,7 @@
 inline void pcf50606_i2c_stop(void)
 {
 #ifdef USE_ASM
-    asm (
+    asm volatile (
         "or.l    %[sdab],(8,%[sdard]) \n" /* SDA_LO_OUT */
 
         "not.l   %[sclb]              \n" /* SCL_HI_IN */
@@ -178,7 +178,7 @@
 inline void pcf50606_i2c_ack(bool ack)
 {
 #ifdef USE_ASM
-    asm (
+    asm volatile (
         "tst.b   %[ack]               \n" /* if (!ack) */
         "bne.s   1f                   \n"
 
@@ -233,7 +233,7 @@
     bool ret;
 
 #ifdef USE_ASM
-    asm (
+    asm volatile (
         "not.l   %[sdab]              \n" /* SDA_HI_IN */
         "and.l   %[sdab],(8,%[sdard]) \n"
         "not.l   %[sdab]              \n"
@@ -363,7 +363,7 @@
     unsigned char byte = 0;
 
 #ifdef USE_ASM
-    asm (
+    asm volatile (
         "not.l   %[sdab]              \n" /* SDA_HI_IN */
         "and.l   %[sdab],(8,%[sdard]) \n"
         "not.l   %[sdab]              \n"