mx6sxsabresd: Load the correct dtb for revA board

Currently only imx6sx-sdb.dtb is loaded, but if revA board is used the
correct dtb is imx6sx-sdb-reva.dtb, so make this possible.

While at it, remove an extra 'mmc dev'.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>

arch/arm/mach-imx/mx6/Kconfig

@@ -255,6 +255,7 @@ config TARGET_MX6SLLEVK
 
 config TARGET_MX6SXSABRESD
 	bool "mx6sxsabresd"
+	select BOARD_LATE_INIT
 	select MX6SX
 	select SUPPORT_SPL
 	select DM

board/freescale/mx6sxsabresd/mx6sxsabresd.c

@@ -540,9 +540,23 @@ int board_init(void)
 	return 0;
 }
 
+static bool is_reva(void)
+{
+	return (nxp_board_rev() == 1);
+}
+
+int board_late_init(void)
+{
+#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
+	if (is_reva())
+		env_set("board_rev", "REVA");
+#endif
+	return 0;
+}
+
 int checkboard(void)
 {
-	puts("Board: MX6SX SABRE SDB\n");
+	printf("Board: MX6SX SABRE SDB rev%c\n", nxp_board_rev_string());
 
 	return 0;
 }

configs/mx6sxsabresd_defconfig

@@ -2,6 +2,7 @@ CONFIG_ARM=y
 CONFIG_ARCH_MX6=y
 CONFIG_TARGET_MX6SXSABRESD=y
 # CONFIG_CMD_BMODE is not set
+CONFIG_NXP_BOARD_REVISION=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx6sxsabresd/imximage.cfg"
 # CONFIG_CONSOLE_MUX is not set
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y

configs/mx6sxsabresd_spl_defconfig

@@ -9,6 +9,7 @@ CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL_LIBDISK_SUPPORT=y
 CONFIG_SPL_WATCHDOG_SUPPORT=y
 # CONFIG_CMD_BMODE is not set
+CONFIG_NXP_BOARD_REVISION=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg"
 # CONFIG_CONSOLE_MUX is not set
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y

include/configs/mx6sxsabresd.h

@@ -43,6 +43,7 @@
 #define UPDATE_M4_ENV ""
 #endif
 
+#define CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	UPDATE_M4_ENV \
 	"script=boot.scr\0" \
@@ -105,10 +106,13 @@
 			"fi; " \
 		"else " \
 			"bootz; " \
-		"fi;\0"
+		"fi;\0" \
+	"findfdt="\
+		"if test test $board_rev = REVA ; then " \
+			"setenv fdt_file imx6sx-sdb-reva.dtb; fi; " \
 
 #define CONFIG_BOOTCOMMAND \
-	   "mmc dev ${mmcdev};" \
+	   "run findfdt; " \
 	   "mmc dev ${mmcdev}; if mmc rescan; then " \
 		   "if run loadbootscript; then " \
 			   "run bootscript; " \