diff --git a/configs/eagle100/README.txt b/configs/eagle100/README.txt
index b4bca39cb68..d868817cc03 100644
--- a/configs/eagle100/README.txt
+++ b/configs/eagle100/README.txt
@@ -147,6 +147,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you are
   building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/configs/ekk-lm3s9b96/README.txt b/configs/ekk-lm3s9b96/README.txt
index 2ad4354779f..78fe96ef55b 100644
--- a/configs/ekk-lm3s9b96/README.txt
+++ b/configs/ekk-lm3s9b96/README.txt
@@ -225,6 +225,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you
   are building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/configs/fire-stm32v2/README.txt b/configs/fire-stm32v2/README.txt
index 9e5d94c230f..0cf782a9436 100644
--- a/configs/fire-stm32v2/README.txt
+++ b/configs/fire-stm32v2/README.txt
@@ -347,6 +347,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you are
   building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ================================
 
diff --git a/configs/hymini-stm32v/README.txt b/configs/hymini-stm32v/README.txt
index 51f3c1fe3b1..2c8f3a16afa 100644
--- a/configs/hymini-stm32v/README.txt
+++ b/configs/hymini-stm32v/README.txt
@@ -167,6 +167,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you are
   building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ================================
 
diff --git a/configs/kwikstik-k40/README.txt b/configs/kwikstik-k40/README.txt
index 246fa912e67..7a68fcffa81 100644
--- a/configs/kwikstik-k40/README.txt
+++ b/configs/kwikstik-k40/README.txt
@@ -290,6 +290,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you are
   building a Cortex-M4 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ================================
 
diff --git a/configs/lincoln60/README.txt b/configs/lincoln60/README.txt
index 35fe32267cb..07ca167cd14 100644
--- a/configs/lincoln60/README.txt
+++ b/configs/lincoln60/README.txt
@@ -189,6 +189,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you
   are building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/configs/lm3s6432-s2e/README.txt b/configs/lm3s6432-s2e/README.txt
index 460b5546d79..3630ccc5ec1 100644
--- a/configs/lm3s6432-s2e/README.txt
+++ b/configs/lm3s6432-s2e/README.txt
@@ -219,6 +219,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you
   are building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/configs/lm3s6965-ek/README.txt b/configs/lm3s6965-ek/README.txt
index 4aba09beebf..f6c32ee82a1 100644
--- a/configs/lm3s6965-ek/README.txt
+++ b/configs/lm3s6965-ek/README.txt
@@ -249,7 +249,11 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you
   are building a Cortex-M3 toolchain for Cygwin under Windows.
 
-  NOTE: This is an OABI toolchain.
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
 
 NuttX OABI "buildroot" Toolchain
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/configs/lm3s8962-ek/README.txt b/configs/lm3s8962-ek/README.txt
index 570d158a295..310edabc57c 100644
--- a/configs/lm3s8962-ek/README.txt
+++ b/configs/lm3s8962-ek/README.txt
@@ -233,7 +233,11 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you
   are building a Cortex-M3 toolchain for Cygwin under Windows.
 
-  NOTE: This is an OABI toolchain.
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
 
 NuttX OABI "buildroot" Toolchain
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/configs/lpc4330-xplorer/README.txt b/configs/lpc4330-xplorer/README.txt
index ea1098be54f..8c88b5758ba 100644
--- a/configs/lpc4330-xplorer/README.txt
+++ b/configs/lpc4330-xplorer/README.txt
@@ -501,6 +501,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you
   are building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ================================
 
diff --git a/configs/lpcxpresso-lpc1768/README.txt b/configs/lpcxpresso-lpc1768/README.txt
index cbc5f50e8ce..8ea038514b8 100644
--- a/configs/lpcxpresso-lpc1768/README.txt
+++ b/configs/lpcxpresso-lpc1768/README.txt
@@ -445,6 +445,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you
   are building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/configs/mbed/README.txt b/configs/mbed/README.txt
index df509a199a9..4b413560ab9 100644
--- a/configs/mbed/README.txt
+++ b/configs/mbed/README.txt
@@ -159,6 +159,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you
   are building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/configs/nucleus2g/README.txt b/configs/nucleus2g/README.txt
index 39ae370ccc8..86a8944abe5 100644
--- a/configs/nucleus2g/README.txt
+++ b/configs/nucleus2g/README.txt
@@ -219,6 +219,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you
   are building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/configs/olimex-lpc1766stk/README.txt b/configs/olimex-lpc1766stk/README.txt
index dcea9d0b710..f53ed4647d0 100644
--- a/configs/olimex-lpc1766stk/README.txt
+++ b/configs/olimex-lpc1766stk/README.txt
@@ -307,6 +307,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you
   are building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/configs/sam3u-ek/README.txt b/configs/sam3u-ek/README.txt
index 91f8824098e..fa5d52b69c4 100644
--- a/configs/sam3u-ek/README.txt
+++ b/configs/sam3u-ek/README.txt
@@ -162,6 +162,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you are
   building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/configs/shenzhou/README.txt b/configs/shenzhou/README.txt
index ff4cf74508b..772c59a174f 100644
--- a/configs/shenzhou/README.txt
+++ b/configs/shenzhou/README.txt
@@ -384,6 +384,12 @@ NuttX EABI buildroot Toolchain
   detailed PLUS some special instructions that you will need to follow if you are
   building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ================================
 
diff --git a/configs/stm3210e-eval/README.txt b/configs/stm3210e-eval/README.txt
index 65f511320ae..50e413b42c7 100644
--- a/configs/stm3210e-eval/README.txt
+++ b/configs/stm3210e-eval/README.txt
@@ -170,6 +170,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you are
   building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ================================
 
diff --git a/configs/stm3220g-eval/README.txt b/configs/stm3220g-eval/README.txt
index 36fd75d2569..58a6f156c44 100644
--- a/configs/stm3220g-eval/README.txt
+++ b/configs/stm3220g-eval/README.txt
@@ -209,6 +209,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you are
   building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ================================
 
diff --git a/configs/stm3240g-eval/README.txt b/configs/stm3240g-eval/README.txt
index 6da18b7e50e..8604f344a5f 100644
--- a/configs/stm3240g-eval/README.txt
+++ b/configs/stm3240g-eval/README.txt
@@ -216,6 +216,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you are
   building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ================================
 
diff --git a/configs/stm32f4discovery/README.txt b/configs/stm32f4discovery/README.txt
index 2054e90c63b..dc25b220e4e 100644
--- a/configs/stm32f4discovery/README.txt
+++ b/configs/stm32f4discovery/README.txt
@@ -213,6 +213,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you are
   building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ================================
 
diff --git a/configs/twr-k60n512/README.txt b/configs/twr-k60n512/README.txt
index 27644deaef6..3b7b402d7eb 100644
--- a/configs/twr-k60n512/README.txt
+++ b/configs/twr-k60n512/README.txt
@@ -427,6 +427,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you are
   building a Cortex-M4 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ================================
 
diff --git a/configs/vsn/README.txt b/configs/vsn/README.txt
index ae5f374ddd5..657cfdd899d 100644
--- a/configs/vsn/README.txt
+++ b/configs/vsn/README.txt
@@ -167,6 +167,12 @@ NuttX EABI "buildroot" Toolchain
   details PLUS some special instructions that you will need to follow if you are
   building a Cortex-M3 toolchain for Cygwin under Windows.
 
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
 NuttX OABI "buildroot" Toolchain
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^