diff --git a/configs/eagle100/include/board.h b/configs/eagle100/include/board.h
index 096ca84108b..febc93038c4 100644
--- a/configs/eagle100/include/board.h
+++ b/configs/eagle100/include/board.h
@@ -110,13 +110,6 @@
 #define LED_ASSERTION     6     /* ON   OFF */
 #define LED_PANIC         7     /* ON   OFF */
 
-/* Eagle-100 GPIOs ******************************************************************/
-
-/* GPIO for microSD card chip select */
-
-#define SDCCS_GPIO (GPIO_FUNC_OUTPUT | GPIO_PADTYPE_STDWPU | GPIO_STRENGTH_4MA | GPIO_VALUE_ONE | GPIO_PORTG | 2)
-#define LED_GPIO   (GPIO_FUNC_OUTPUT | GPIO_VALUE_ONE | GPIO_PORTE | 1)
-
 /************************************************************************************
  * Public Function Prototypes
  ************************************************************************************/
diff --git a/configs/eagle100/src/eagle100_internal.h b/configs/eagle100/src/eagle100_internal.h
new file mode 100644
index 00000000000..e2ff65fd30f
--- /dev/null
+++ b/configs/eagle100/src/eagle100_internal.h
@@ -0,0 +1,93 @@
+/************************************************************************************
+ * configs/eagle100/src/eagle100_internal.h
+ * arch/arm/src/board/eagle100_internal.n
+ *
+ *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+#ifndef __CONFIGS_EAGLE100_SRC_EAGLE100_INTERNAL_H
+#define __CONFIGS_EAGLE100_SRC_EAGLE100_INTERNAL_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+#include <sys/types.h>
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+
+/* How many SSI modules does this chip support? The LM3S6918 supports 2 SSI
+ * modules (others may support more -- in such case, the following must be
+ * expanded).
+ */
+
+#if LM3S_NSSI == 0
+#  undef CONFIG_SSI0_DISABLE
+#  define CONFIG_SSI0_DISABLE 1
+#  undef CONFIG_SSI1_DISABLE
+#  define CONFIG_SSI1_DISABLE 1
+#elif LM3S_NSSI == 1
+#  undef CONFIG_SSI1_DISABLE
+#  define CONFIG_SSI1_DISABLE 1
+#endif
+
+/* Eagle-100 GPIOs ******************************************************************/
+
+/* GPIO for microSD card chip select */
+
+#define SDCCS_GPIO (GPIO_FUNC_OUTPUT | GPIO_PADTYPE_STDWPU | GPIO_STRENGTH_4MA | \
+                    GPIO_VALUE_ONE | GPIO_PORTG | 1)
+#define LED_GPIO   (GPIO_FUNC_OUTPUT | GPIO_VALUE_ONE | GPIO_PORTE | 1)
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/************************************************************************************
+ * Name: lm3s_ssiinitialize
+ *
+ * Description:
+ *   Called to configure SPI chip select GPIO pins for the Eagle100 board.
+ *
+ ************************************************************************************/
+
+extern void weak_function lm3s_ssiinitialize(void);
+
+#endif /* __ASSEMBLY__ */
+#endif /* __CONFIGS_EAGLE100_SRC_EAGLE100_INTERNAL_H */
+
diff --git a/configs/eagle100/src/up_boot.c b/configs/eagle100/src/up_boot.c
index 874d3dc0644..175e8e9243d 100644
--- a/configs/eagle100/src/up_boot.c
+++ b/configs/eagle100/src/up_boot.c
@@ -46,6 +46,7 @@
 #include <arch/board/board.h>
 
 #include "up_arch.h"
+#include "eagle100_internal.h"
 
 /************************************************************************************
  * Definitions
@@ -70,11 +71,20 @@
 
 void lm3s_boardinitialize(void)
 {
-  /* Configure the SPI-based microSD CS GPIO */
+  /* Configure SPI chip selects if 1) SSI is not disabled, and 2) the weak function
+   * lm3s_ssiinitialize() has been brought into the link.
+   */
 
-  lm3s_configgpio(SDCCS_GPIO);
+/* The Eagle100 microSD CS is on SSI0 */
 
-  /* Configure on-board LEDs */
+#if !defined(CONFIG_SSI0_DISABLE) /* || !defined(CONFIG_SSI1_DISABLE) */
+  if (lm3s_ssiinitialize)
+    {
+      lm3s_ssiinitialize();
+    }
+#endif
+
+  /* Configure on-board LEDs if LED support has been selected. */
 
 #ifdef CONFIG_ARCH_LEDS
   up_ledinit();
diff --git a/configs/eagle100/src/up_leds.c b/configs/eagle100/src/up_leds.c
index 5cb6be0d7cd..f382e63a398 100644
--- a/configs/eagle100/src/up_leds.c
+++ b/configs/eagle100/src/up_leds.c
@@ -49,6 +49,7 @@
 #include "up_arch.h"
 #include "up_internal.h"
 #include "lm3s_internal.h"
+#include "eagle100_internal.h"
 
 /****************************************************************************
  * Definitions
@@ -58,7 +59,7 @@
  * CONFIG_DEBUG_VERBOSE too)
  */
 
-#undef LED_DEBUG /* Define to enable debug */
+#undef LED_DEBUG  /* Define to enable debug */
 
 #ifdef LED_DEBUG
 #  define leddbg  lldbg
diff --git a/configs/eagle100/src/up_ssi.c b/configs/eagle100/src/up_ssi.c
index c14c7ab8915..7230120420c 100644
--- a/configs/eagle100/src/up_ssi.c
+++ b/configs/eagle100/src/up_ssi.c
@@ -41,16 +41,46 @@
 #include <nuttx/config.h>
 #include <sys/types.h>
 
+#include <debug.h>
+
 #include <nuttx/spi.h>
 #include <arch/board/board.h>
 
 #include "up_arch.h"
+#include "chip.h"
 #include "lm3s_internal.h"
+#include "eagle100_internal.h"
+
+/* The Eagle100 microSD CS is on SSI0 */
+
+#if !defined(CONFIG_SSI0_DISABLE) /* || !defined(CONFIG_SSI1_DISABLE) */
 
 /************************************************************************************
  * Definitions
  ************************************************************************************/
 
+/* Enables debug output from this file (needs CONFIG_DEBUG with CONFIG_DEBUG_VERBOSE
+ * too)
+ */
+
+#undef SSI_DEBUG  /* Define to enable debug */
+
+#ifdef SSI_DEBUG
+#  define ssidbg  lldbg
+#  define ssivdbg llvdbg
+#else
+#  define ssidbg(x...)
+#  define ssivdbg(x...)
+#endif
+
+/* Dump GPIO registers */
+
+#ifdef SSI_DEBUG
+#  define ssi_dumpgpio(m) lm3s_dumpgpio(SDCCS_GPIO, m)
+#else
+#  define ssi_dumpgpio(m)
+#endif
+
 /************************************************************************************
  * Private Functions
  ************************************************************************************/
@@ -59,6 +89,23 @@
  * Public Functions
  ************************************************************************************/
 
+/************************************************************************************
+ * Name: lm3s_ssiinitialize
+ *
+ * Description:
+ *   Called to configure SPI chip select GPIO pins for the Eagle100 board.
+ *
+ ************************************************************************************/
+
+void weak_function lm3s_ssiinitialize(void)
+{
+  /* Configure the SPI-based microSD CS GPIO */
+
+  ssi_dumpgpio("lm3s_ssiinitialize() before lm3s_configgpio()");
+  lm3s_configgpio(SDCCS_GPIO);
+  ssi_dumpgpio("lm3s_ssiinitialize() after lm3s_configgpio()");
+}
+
 /****************************************************************************
  * The external functions, lm3s_spiselect and lm3s_spistatus must be provided
  * by board-specific logic.  The are implementations of the select and status
@@ -80,17 +127,22 @@
 
 void lm3s_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, boolean selected)
 {
+  ssidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
   if (devid == SPIDEV_MMCSD)
     {
       /* Assert the CS pin to the card */
 
+      ssi_dumpgpio("lm3s_spiselect() before lm3s_gpiowrite()");
       lm3s_gpiowrite(SDCCS_GPIO, !selected);
+      ssi_dumpgpio("lm3s_spiselect() after lm3s_gpiowrite()");
     }
 }
 
 ubyte lm3s_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
 {
 #warning "Need to check schematic"
+  ssidbg("Returning SPI_STATUS_PRESENT\n");
   return SPI_STATUS_PRESENT;
 }
 
+#endif /* !CONFIG_SSI0_DISABLE || !CONFIG_SSI1_DISABLE */