diff --git a/os/ports/GCC/ARMCMx/chcore_v6m.h b/os/ports/GCC/ARMCMx/chcore_v6m.h
index 1b8f54528..e26c2fddb 100644
--- a/os/ports/GCC/ARMCMx/chcore_v6m.h
+++ b/os/ports/GCC/ARMCMx/chcore_v6m.h
@@ -76,12 +76,12 @@
  *          This value can be zero on those architecture where there is a
  *          separate interrupt stack and the stack space between @p intctx and
  *          @p extctx is known to be zero.
- * @note    In this port it is conservatively set to 16 because the function
+ * @note    In this port it is conservatively set to 32 because the function
  *          @p chSchDoReschedule() can have a stack frame, especially with
  *          compiler optimizations disabled.
  */
 #if !defined(PORT_INT_REQUIRED_STACK)
-#define PORT_INT_REQUIRED_STACK         16
+#define PORT_INT_REQUIRED_STACK         32
 #endif
 
 /**
diff --git a/os/ports/GCC/ARMCMx/chcore_v7m.h b/os/ports/GCC/ARMCMx/chcore_v7m.h
index 430d5bac0..96f91bef6 100644
--- a/os/ports/GCC/ARMCMx/chcore_v7m.h
+++ b/os/ports/GCC/ARMCMx/chcore_v7m.h
@@ -73,12 +73,12 @@
  *          This value can be zero on those architecture where there is a
  *          separate interrupt stack and the stack space between @p intctx and
  *          @p extctx is known to be zero.
- * @note    In this port it is conservatively set to 16 because the function
+ * @note    In this port it is conservatively set to 32 because the function
  *          @p chSchDoReschedule() can have a stack frame, especially with
  *          compiler optimizations disabled.
  */
 #if !defined(PORT_INT_REQUIRED_STACK)
-#define PORT_INT_REQUIRED_STACK         16
+#define PORT_INT_REQUIRED_STACK         32
 #endif
 
 /**
diff --git a/os/ports/IAR/ARMCMx/chcore_v6m.h b/os/ports/IAR/ARMCMx/chcore_v6m.h
index 4a3294ef7..7219a0e09 100644
--- a/os/ports/IAR/ARMCMx/chcore_v6m.h
+++ b/os/ports/IAR/ARMCMx/chcore_v6m.h
@@ -76,12 +76,12 @@
  *          This value can be zero on those architecture where there is a
  *          separate interrupt stack and the stack space between @p intctx and
  *          @p extctx is known to be zero.
- * @note    In this port it is conservatively set to 16 because the function
+ * @note    In this port it is conservatively set to 32 because the function
  *          @p chSchDoReschedule() can have a stack frame, especially with
  *          compiler optimizations disabled.
  */
 #if !defined(PORT_INT_REQUIRED_STACK)
-#define PORT_INT_REQUIRED_STACK         16
+#define PORT_INT_REQUIRED_STACK         32
 #endif
 
 /**
diff --git a/os/ports/IAR/ARMCMx/chcore_v7m.h b/os/ports/IAR/ARMCMx/chcore_v7m.h
index 1fb4fb10e..538ff3d04 100644
--- a/os/ports/IAR/ARMCMx/chcore_v7m.h
+++ b/os/ports/IAR/ARMCMx/chcore_v7m.h
@@ -73,12 +73,12 @@
  *          This value can be zero on those architecture where there is a
  *          separate interrupt stack and the stack space between @p intctx and
  *          @p extctx is known to be zero.
- * @note    In this port it is conservatively set to 16 because the function
+ * @note    In this port it is conservatively set to 32 because the function
  *          @p chSchDoReschedule() can have a stack frame, especially with
  *          compiler optimizations disabled.
  */
 #if !defined(PORT_INT_REQUIRED_STACK)
-#define PORT_INT_REQUIRED_STACK         16
+#define PORT_INT_REQUIRED_STACK         32
 #endif
 
 /**
diff --git a/os/ports/RVCT/ARMCMx/chcore_v6m.h b/os/ports/RVCT/ARMCMx/chcore_v6m.h
index 8140022f7..45c29f3f0 100644
--- a/os/ports/RVCT/ARMCMx/chcore_v6m.h
+++ b/os/ports/RVCT/ARMCMx/chcore_v6m.h
@@ -76,12 +76,12 @@
  *          This value can be zero on those architecture where there is a
  *          separate interrupt stack and the stack space between @p intctx and
  *          @p extctx is known to be zero.
- * @note    In this port it is conservatively set to 16 because the function
+ * @note    In this port it is conservatively set to 32 because the function
  *          @p chSchDoReschedule() can have a stack frame, especially with
  *          compiler optimizations disabled.
  */
 #if !defined(PORT_INT_REQUIRED_STACK)
-#define PORT_INT_REQUIRED_STACK         16
+#define PORT_INT_REQUIRED_STACK         32
 #endif
 
 /**
diff --git a/os/ports/RVCT/ARMCMx/chcore_v7m.h b/os/ports/RVCT/ARMCMx/chcore_v7m.h
index 3a75d9d22..9c71eab67 100644
--- a/os/ports/RVCT/ARMCMx/chcore_v7m.h
+++ b/os/ports/RVCT/ARMCMx/chcore_v7m.h
@@ -73,12 +73,12 @@
  *          This value can be zero on those architecture where there is a
  *          separate interrupt stack and the stack space between @p intctx and
  *          @p extctx is known to be zero.
- * @note    In this port it is conservatively set to 16 because the function
+ * @note    In this port it is conservatively set to 32 because the function
  *          @p chSchDoReschedule() can have a stack frame, especially with
  *          compiler optimizations disabled.
  */
 #if !defined(PORT_INT_REQUIRED_STACK)
-#define PORT_INT_REQUIRED_STACK         16
+#define PORT_INT_REQUIRED_STACK         32
 #endif
 
 /**
diff --git a/readme.txt b/readme.txt
index 95707436c..78bdb7f4f 100644
--- a/readme.txt
+++ b/readme.txt
@@ -113,6 +113,12 @@
   duplicate the code in each application or demo.
 - NEW: Updated the MSP port to work with the latest MSPGCC compiler (4.6.3
   LTS 20120406 unpatched), now the old MSPGCC 3.2.3 is no more supported.
+- CHANGE: The PORT_INT_REQUIRED_STACK parameter for the Cortex-Mx ports has
+  been increased to 32 from 16 because the stack frame sizes are increased
+  when compiling with optimizations disabled, which is common during
+  debugging. In order to save RAM trim back this value when compiling with
+  optimizations enabled.
+- CHANGE: Renamed Ethernet driver in AT91 HAL ETHD1.
 
 *** 2.4.0 ***
 - NEW: Implemented new makefile system for ARM GCC ports, now objects,