imx:mx6slevk add spi nor boot support

Add spi nor boot support for mx6slevk board.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>

board/freescale/mx6slevk/MAINTAINERS

@@ -4,3 +4,4 @@ S:	Maintained
 F:	board/freescale/mx6slevk/
 F:	include/configs/mx6slevk.h
 F:	configs/mx6slevk_defconfig
+F:	configs/mx6slevk_spinor_defconfig

configs/mx6slevk_spinor_defconfig

@@ -0,0 +1,3 @@
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx6slevk/imximage.cfg,MX6SL,SYS_BOOT_SPINOR"
+CONFIG_ARM=y
+CONFIG_TARGET_MX6SLEVK=y

include/configs/mx6slevk.h

@@ -187,9 +187,20 @@
 /* FLASH and environment organization */
 #define CONFIG_SYS_NO_FLASH
 
-#define CONFIG_ENV_OFFSET		(6 * SZ_64K)
 #define CONFIG_ENV_SIZE			SZ_8K
+
+#if defined CONFIG_SYS_BOOT_SPINOR
+#define CONFIG_ENV_IS_IN_SPI_FLASH
+#define CONFIG_ENV_OFFSET               (768 * 1024)
+#define CONFIG_ENV_SECT_SIZE            (64 * 1024)
+#define CONFIG_ENV_SPI_BUS              CONFIG_SF_DEFAULT_BUS
+#define CONFIG_ENV_SPI_CS               CONFIG_SF_DEFAULT_CS
+#define CONFIG_ENV_SPI_MODE             CONFIG_SF_DEFAULT_MODE
+#define CONFIG_ENV_SPI_MAX_HZ           CONFIG_SF_DEFAULT_SPEED
+#else
+#define CONFIG_ENV_OFFSET		(6 * SZ_64K)
 #define CONFIG_ENV_IS_IN_MMC
+#endif
 
 #define CONFIG_OF_LIBFDT
 #define CONFIG_CMD_BOOTZ