arm: atmel: sama5d3: add spi spl boot support

Add SPI SPL boot support for sama5d3xek board.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/include/configs/sama5d3xek.h b/include/configs/sama5d3xek.h
index c34feb5..510f22c 100644
--- a/include/configs/sama5d3xek.h
+++ b/include/configs/sama5d3xek.h
@@ -258,6 +258,8 @@
 #define CONFIG_SPL_SERIAL_SUPPORT
 
 #define CONFIG_SPL_BOARD_INIT
+#define CONFIG_SYS_MONITOR_LEN		(512 << 10)
+
 #ifdef CONFIG_SYS_USE_MMC
 #define CONFIG_SPL_LDSCRIPT		arch/arm/cpu/at91-common/u-boot-spl.lds
 #define CONFIG_SPL_MMC_SUPPORT
@@ -267,6 +269,15 @@
 #define CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME	"u-boot.img"
 #define CONFIG_SPL_FAT_SUPPORT
 #define CONFIG_SPL_LIBDISK_SUPPORT
+
+#elif CONFIG_SYS_USE_SERIALFLASH
+#define CONFIG_SPL_SPI_SUPPORT
+#define CONFIG_SPL_SPI_FLASH_SUPPORT
+#define CONFIG_SPL_SPI_LOAD
+#define CONFIG_SPL_SPI_BUS		0
+#define CONFIG_SPL_SPI_CS		0
+#define CONFIG_SYS_SPI_U_BOOT_OFFS	0x8400
+
 #endif
 
 #endif