diff --git a/configs/stm32f4discovery/cxxtest/setenv.sh b/configs/stm32f4discovery/cxxtest/setenv.sh
index f50573e0952..3428bcf4e68 100755
--- a/configs/stm32f4discovery/cxxtest/setenv.sh
+++ b/configs/stm32f4discovery/cxxtest/setenv.sh
@@ -59,6 +59,10 @@ fi
 export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 #export TOOLCHAIN_BIN="/cygdrive/c/Users/MyName/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 
+# This is the location where I installed the ARM "GNU Tools for ARM Embedded Processors"
+# You can this free toolchain here https://launchpad.net/gcc-arm-embedded
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q2/bin"
+
 # These are the Cygwin paths to the locations where I installed the Atollic
 # toolchain under windows.  You will also have to edit this if you install
 # the Atollic toolchain in any other location.  /usr/bin is added before
diff --git a/configs/stm32f4discovery/elf/setenv.sh b/configs/stm32f4discovery/elf/setenv.sh
index e66cc161402..40e5d91455f 100755
--- a/configs/stm32f4discovery/elf/setenv.sh
+++ b/configs/stm32f4discovery/elf/setenv.sh
@@ -58,6 +58,10 @@ fi
 export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery G++ Lite/bin"
 #export TOOLCHAIN_BIN="/cygdrive/c/Users/MyName/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 
+# This is the location where I installed the ARM "GNU Tools for ARM Embedded Processors"
+# You can this free toolchain here https://launchpad.net/gcc-arm-embedded
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q2/bin"
+
 # These are the Cygwin paths to the locations where I installed the Atollic
 # toolchain under windows.  You will also have to edit this if you install
 # the Atollic toolchain in any other location.  /usr/bin is added before
diff --git a/configs/stm32f4discovery/ipv6/setenv.sh b/configs/stm32f4discovery/ipv6/setenv.sh
index 44b4996e3a7..28b9db6ca34 100755
--- a/configs/stm32f4discovery/ipv6/setenv.sh
+++ b/configs/stm32f4discovery/ipv6/setenv.sh
@@ -59,6 +59,10 @@ fi
 export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 #export TOOLCHAIN_BIN="/cygdrive/c/Users/MyName/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 
+# This is the location where I installed the ARM "GNU Tools for ARM Embedded Processors"
+# You can this free toolchain here https://launchpad.net/gcc-arm-embedded
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q2/bin"
+
 # These are the Cygwin paths to the locations where I installed the Atollic
 # toolchain under windows.  You will also have to edit this if you install
 # the Atollic toolchain in any other location.  /usr/bin is added before
diff --git a/configs/stm32f4discovery/kostest/setenv.sh b/configs/stm32f4discovery/kostest/setenv.sh
index 1a231c51771..6571513b650 100755
--- a/configs/stm32f4discovery/kostest/setenv.sh
+++ b/configs/stm32f4discovery/kostest/setenv.sh
@@ -58,6 +58,10 @@ fi
 export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery G++ Lite/bin"
 #export TOOLCHAIN_BIN="/cygdrive/c/Users/MyName/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 
+# This is the location where I installed the ARM "GNU Tools for ARM Embedded Processors"
+# You can this free toolchain here https://launchpad.net/gcc-arm-embedded
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q2/bin"
+
 # These are the Cygwin paths to the locations where I installed the Atollic
 # toolchain under windows.  You will also have to edit this if you install
 # the Atollic toolchain in any other location.  /usr/bin is added before
diff --git a/configs/stm32f4discovery/netnsh/setenv.sh b/configs/stm32f4discovery/netnsh/setenv.sh
index 054a780d8e1..51a6d2a9615 100755
--- a/configs/stm32f4discovery/netnsh/setenv.sh
+++ b/configs/stm32f4discovery/netnsh/setenv.sh
@@ -59,6 +59,10 @@ fi
 export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 #export TOOLCHAIN_BIN="/cygdrive/c/Users/MyName/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 
+# This is the location where I installed the ARM "GNU Tools for ARM Embedded Processors"
+# You can this free toolchain here https://launchpad.net/gcc-arm-embedded
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q2/bin"
+
 # These are the Cygwin paths to the locations where I installed the Atollic
 # toolchain under windows.  You will also have to edit this if you install
 # the Atollic toolchain in any other location.  /usr/bin is added before
diff --git a/configs/stm32f4discovery/nsh/setenv.sh b/configs/stm32f4discovery/nsh/setenv.sh
index 3c8e2e52d28..d67e6fdc7df 100755
--- a/configs/stm32f4discovery/nsh/setenv.sh
+++ b/configs/stm32f4discovery/nsh/setenv.sh
@@ -58,6 +58,10 @@ fi
 export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery G++ Lite/bin"
 #export TOOLCHAIN_BIN="/cygdrive/c/Users/MyName/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 
+# This is the location where I installed the ARM "GNU Tools for ARM Embedded Processors"
+# You can this free toolchain here https://launchpad.net/gcc-arm-embedded
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q2/bin"
+
 # These are the Cygwin paths to the locations where I installed the Atollic
 # toolchain under windows.  You will also have to edit this if you install
 # the Atollic toolchain in any other location.  /usr/bin is added before
diff --git a/configs/stm32f4discovery/nxlines/setenv.sh b/configs/stm32f4discovery/nxlines/setenv.sh
index d0853a4afff..5c15732e96b 100755
--- a/configs/stm32f4discovery/nxlines/setenv.sh
+++ b/configs/stm32f4discovery/nxlines/setenv.sh
@@ -58,6 +58,10 @@ fi
 export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery G++ Lite/bin"
 #export TOOLCHAIN_BIN="/cygdrive/c/Users/MyName/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 
+# This is the location where I installed the ARM "GNU Tools for ARM Embedded Processors"
+# You can this free toolchain here https://launchpad.net/gcc-arm-embedded
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q2/bin"
+
 # These are the Cygwin paths to the locations where I installed the Atollic
 # toolchain under windows.  You will also have to edit this if you install
 # the Atollic toolchain in any other location.  /usr/bin is added before
diff --git a/configs/stm32f4discovery/pm/setenv.sh b/configs/stm32f4discovery/pm/setenv.sh
index dd50bc19619..815d58bf7d6 100644
--- a/configs/stm32f4discovery/pm/setenv.sh
+++ b/configs/stm32f4discovery/pm/setenv.sh
@@ -58,6 +58,10 @@ fi
 export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery G++ Lite/bin"
 #export TOOLCHAIN_BIN="/cygdrive/c/Users/MyName/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 
+# This is the location where I installed the ARM "GNU Tools for ARM Embedded Processors"
+# You can this free toolchain here https://launchpad.net/gcc-arm-embedded
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q2/bin"
+
 # These are the Cygwin paths to the locations where I installed the Atollic
 # toolchain under windows.  You will also have to edit this if you install
 # the Atollic toolchain in any other location.  /usr/bin is added before
diff --git a/configs/stm32f4discovery/posix_spawn/setenv.sh b/configs/stm32f4discovery/posix_spawn/setenv.sh
index a85a96cb75e..5253e558232 100755
--- a/configs/stm32f4discovery/posix_spawn/setenv.sh
+++ b/configs/stm32f4discovery/posix_spawn/setenv.sh
@@ -58,6 +58,10 @@ fi
 export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery G++ Lite/bin"
 #export TOOLCHAIN_BIN="/cygdrive/c/Users/MyName/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 
+# This is the location where I installed the ARM "GNU Tools for ARM Embedded Processors"
+# You can this free toolchain here https://launchpad.net/gcc-arm-embedded
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q2/bin"
+
 # These are the Cygwin paths to the locations where I installed the Atollic
 # toolchain under windows.  You will also have to edit this if you install
 # the Atollic toolchain in any other location.  /usr/bin is added before
diff --git a/configs/stm32f4discovery/usbnsh/setenv.sh b/configs/stm32f4discovery/usbnsh/setenv.sh
index eb43676567d..602a6adaaeb 100755
--- a/configs/stm32f4discovery/usbnsh/setenv.sh
+++ b/configs/stm32f4discovery/usbnsh/setenv.sh
@@ -58,6 +58,10 @@ fi
 export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery G++ Lite/bin"
 #export TOOLCHAIN_BIN="/cygdrive/c/Users/MyName/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
 
+# This is the location where I installed the ARM "GNU Tools for ARM Embedded Processors"
+# You can this free toolchain here https://launchpad.net/gcc-arm-embedded
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q2/bin"
+
 # These are the Cygwin paths to the locations where I installed the Atollic
 # toolchain under windows.  You will also have to edit this if you install
 # the Atollic toolchain in any other location.  /usr/bin is added before