diff --git a/configs/ea3131/src/ea3131_internal.h b/configs/ea3131/src/ea3131_internal.h
index 58368e80e5c..0f28ea1cc69 100755
--- a/configs/ea3131/src/ea3131_internal.h
+++ b/configs/ea3131/src/ea3131_internal.h
@@ -45,20 +45,24 @@
 #include <nuttx/compiler.h>
 #include <stdint.h>
 
+#include "lpc313x_ioconfig.h"
+
 /************************************************************************************
  * Definitions
  ************************************************************************************/
 
 /* EA3131L GPIOs ********************************************************************/
 
-/* LEDs */
+/* LEDs -- interface through an I2C GPIO expander */
 
 /* BUTTONS -- NOTE that some have EXTI interrupts configured */
 
 /* SPI Chip Selects */
+/* SPI NOR flash is the only device on SPI. SPI_CS_OUT0 is its chip select */
 
-/* USB Soft Connect Pullup*/
+#define SPINOR_CS IOCONFIG_SPI_CSOUT0
 
+/* USB Soft Connect Pullup -- NONE */
 
 /************************************************************************************
  * Public Types
diff --git a/configs/ea3131/src/up_spi.c b/configs/ea3131/src/up_spi.c
index 7eef2db6644..66c9d228f35 100755
--- a/configs/ea3131/src/up_spi.c
+++ b/configs/ea3131/src/up_spi.c
@@ -100,6 +100,7 @@ void weak_function lpc313x_spiinitialize(void)
    *       architecture.
    */
 
+  gpio_outputhigh(LPC313X_IOCONFIG_SPI, SPINOR_CS);
 }
 
 /****************************************************************************
@@ -130,6 +131,18 @@ void weak_function lpc313x_spiinitialize(void)
 void lpc313x_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
 {
   spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
+
+  if (devid == SPIDEV_FLASH)
+    {
+      if (selected)
+        {
+          gpio_outputlow(LPC313X_IOCONFIG_SPI, SPINOR_CS);
+        }
+      else
+        {
+          gpio_outputhigh(LPC313X_IOCONFIG_SPI, SPINOR_CS);
+        }
+    }
 }
 
 uint8_t lpc313x_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)