diff --git a/configs/sama5d4-ek/at25boot/defconfig b/configs/sama5d4-ek/at25boot/defconfig
index 3f7f82de186..169c75a43db 100644
--- a/configs/sama5d4-ek/at25boot/defconfig
+++ b/configs/sama5d4-ek/at25boot/defconfig
@@ -293,7 +293,7 @@ CONFIG_RAM_START=0x00200000
 CONFIG_RAM_VSTART=0x00200000
 CONFIG_RAM_SIZE=114688
 CONFIG_ARCH_HAVE_SDRAM=y
-CONFIG_BOOT_SDRAM_DATA=y
+# CONFIG_BOOT_SDRAM_DATA is not set
 
 #
 # Board Selection
diff --git a/configs/sama5d4-ek/src/Makefile b/configs/sama5d4-ek/src/Makefile
index d4254223b19..7d25214052b 100644
--- a/configs/sama5d4-ek/src/Makefile
+++ b/configs/sama5d4-ek/src/Makefile
@@ -66,6 +66,10 @@ ifeq ($(CONFIG_SAMA5D4EK_DRAM_MAIN),y)
 CSRCS += dram_main.c
 endif
 
+ifeq ($(CONFIG_SAMA5D4EK_AT25_MAIN),y)
+CSRCS += at25_main.c
+endif
+
 ifeq ($(CONFIG_MTD_AT25),y)
 ifeq ($(CONFIG_SAMA5_SPI0),y)
 CSRCS += sam_at25.c
diff --git a/configs/sama5d4-ek/src/at25_main.c b/configs/sama5d4-ek/src/at25_main.c
index 30e4eb52243..5ec698fc6ce 100644
--- a/configs/sama5d4-ek/src/at25_main.c
+++ b/configs/sama5d4-ek/src/at25_main.c
@@ -40,9 +40,15 @@
 #include <nuttx/config.h>
 
 #include <stdint.h>
+#include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
 #include <debug.h>
 
+#include <nuttx/streams.h>
 #include <arch/irq.h>
 #include <apps/hex2bin.h>
 
@@ -57,19 +63,19 @@
 #  error The AT25 Serial FLASH is not available
 #endif
 
-#ifndef CONFIG_SAMA5D4EK_NAND_AUTOMOUNT
-#  error CONFIG_SAMA5D4EK_NAND_AUTOMOUNT must be selected
+#ifndef CONFIG_SAMA5D4EK_AT25_AUTOMOUNT
+#  error CONFIG_SAMA5D4EK_AT25_AUTOMOUNT must be selected
 #endif
 
 #ifndef CONFIG_SAMA5D4EK_AT25_CHARDEV
 #  error CONFIG_SAMA5D4EK_AT25_CHARDEV must be selected
 #endif
 
-#ifndef CONFIG_BOOT_SDRAM_DATA
-#  error CONFIG_BOOT_SDRAM_DATA must be selected
+#ifdef CONFIG_BOOT_SDRAM_DATA
+#  error CONFIG_BOOT_SDRAM_DATA must NOT be selected
 #endif
 
-#if defined(CONFIG_SAMA5D4EK_AT25_PROGSIZE) || CONFIG_SAMA5D4EK_AT25_PROGSIZE < 128
+#if !defined(CONFIG_SAMA5D4EK_AT25_PROGSIZE) || CONFIG_SAMA5D4EK_AT25_PROGSIZE < 128
 #  error Large CONFIG_SAMA5D4EK_AT25_PROGSIZE must be selected
 #endif
 
@@ -84,9 +90,8 @@
  * Private Data
  ****************************************************************************/
 
-static uint8_t g_heximage[CONFIG_SAMA5D4EK_AT25_PROGSIZE];
 static uint8_t g_iobuffer[IOBUFFER_SIZE];
-statid uint8_t g_at25dev[DEVNAME_MAXSIZE];
+static char g_at25dev[DEVNAME_MAXSIZE];
 
 /****************************************************************************
  * Private Functions
@@ -149,11 +154,12 @@ int at25_main(int argc, char *argv)
 
   lib_rawinstream(&rawinstream, 0);
 
-  /* Wrap the memory buffer as a seek-able OUT stream in which we can buffer
-   * the binary data.
+  /* Define a memory buffer of size CONFIG_SAMA5D4EK_AT25_PROGSIZE at the
+   * beginning of SDRAM. Wrap the memory buffer as a seek-able OUT stream in
+   * which we can buffer the binary data.
    */
 
-  lib_memsostream(&memoutstream, (FAR char *)g_heximage,
+  lib_memsostream(&memoutstream, (FAR char *)SAM_DDRCS_VSECTION,
                   CONFIG_SAMA5D4EK_AT25_PROGSIZE);
 
   /* We are ready to load the Intel HEX stream into DRAM.
@@ -186,7 +192,7 @@ int at25_main(int argc, char *argv)
          memoutstream.public.nput);
 
   remaining = memoutstream.public.nput;
-  dest      = g_heximage;
+  dest      = (uint8_t *)CONFIG_SAMA5D4EK_AT25_PROGSIZE;
 
   do
     {
@@ -229,7 +235,7 @@ int at25_main(int argc, char *argv)
     }
 
   remaining = memoutstream.public.nput;
-  src = g_heximage;
+  src = (const uint8_t *)CONFIG_SAMA5D4EK_AT25_PROGSIZE;
 
   do
     {
diff --git a/configs/sama5d4-ek/src/sam_at25.c b/configs/sama5d4-ek/src/sam_at25.c
index 950b64d8edd..7ee7f449e5c 100644
--- a/configs/sama5d4-ek/src/sam_at25.c
+++ b/configs/sama5d4-ek/src/sam_at25.c
@@ -77,8 +77,8 @@ int sam_at25_automount(int minor)
   FAR struct spi_dev_s *spi;
   FAR struct mtd_dev_s *mtd;
 #ifdef CONFIG_SAMA5D4EK_AT25_CHARDEV
-  uint8_t blockdev[18];
-  uint8_t chardev[12];
+  char blockdev[18];
+  char chardev[12];
 #endif
   static bool initialized = false;
   int ret;