i.MX6UL: isiot: Add modeboot env via board_late_init

Add runtime, modeboot env which is setting mmcboot, or
nandboot based on the bootdevice so-that conditional
macros b/w MMC and NAND for CONFIG_BOOTCOMMAND should
be avoided in config files.

Cc: Matteo Lisi <matteo.lisi@engicam.com>
Cc: Michael Trimarchi <michael@amarulasolutions.com>
Reviewed by: Stefano Babic <sbabic@denx.de>
Signed-off-by: NJagan Teki <jagan@amarulasolutions.com>

board/engicam/isiotmx6ul/isiotmx6ul.c

@@ -103,6 +103,27 @@ static void setup_gpmi_nand(void)
 }
 #endif /* CONFIG_NAND_MXS */
 
+int board_late_init(void)
+{
+	switch ((imx6_src_get_boot_mode() & IMX6_BMODE_MASK) >>
+			IMX6_BMODE_SHIFT) {
+	case IMX6_BMODE_SD:
+	case IMX6_BMODE_ESD:
+	case IMX6_BMODE_MMC:
+	case IMX6_BMODE_EMMC:
+		setenv("modeboot", "mmcboot");
+		break;
+	case IMX6_BMODE_NAND:
+		setenv("modeboot", "nandboot");
+		break;
+	default:
+		setenv("modeboot", "");
+		break;
+	}
+
+	return 0;
+}
+
 int board_init(void)
 {
 	/* Address of boot parameters */

configs/imx6ul_isiot_emmc_defconfig

@@ -37,3 +37,4 @@ CONFIG_PINCTRL=y
 CONFIG_PINCTRL_IMX6=y
 CONFIG_MXC_UART=y
 CONFIG_IMX_THERMAL=y
+CONFIG_BOARD_LATE_INIT=y

configs/imx6ul_isiot_mmc_defconfig

@@ -39,3 +39,4 @@ CONFIG_PINCTRL=y
 CONFIG_PINCTRL_IMX6=y
 CONFIG_MXC_UART=y
 CONFIG_IMX_THERMAL=y
+CONFIG_BOARD_LATE_INIT=y

configs/imx6ul_isiot_nand_defconfig

@@ -40,3 +40,4 @@ CONFIG_PINCTRL_IMX6=y
 CONFIG_SYS_I2C_MXC=y
 CONFIG_MXC_UART=y
 CONFIG_IMX_THERMAL=y
+CONFIG_BOARD_LATE_INIT=y

include/configs/imx6ul_isiot.h

@@ -64,8 +64,7 @@
 	"fitboot=echo Booting FIT image from mmc ...; " \
 		"run mmcargs; " \
 		"bootm ${loadaddr}\0" \
-	"mmcboot=echo Booting from mmc ...; " \
-		"run mmcargs; " \
+	"_mmcboot=run mmcargs; " \
 		"if test ${boot_fdt} = yes || test ${boot_fdt} = try; then " \
 			"if run loadfdt; then " \
 				"bootm ${loadaddr} - ${fdt_addr}; " \
@@ -79,21 +78,7 @@
 		"else " \
 			"bootm; " \
 		"fi\0" \
-	"nandboot=echo Booting from nand ...; " \
-		"if mtdparts; then " \
-			"echo Starting nand boot ...; " \
-		"else " \
-			"mtdparts default; " \
-		"fi; " \
-		"run ubiargs; " \
-		"nand read ${loadaddr} kernel 0x800000; " \
-		"nand read ${fdt_addr} dtb 0x100000; " \
-		"bootm ${loadaddr} - ${fdt_addr}\0"
-
-#ifdef CONFIG_NAND_MXS
-# define CONFIG_BOOTCOMMAND		"run nandboot"
-#else
-# define CONFIG_BOOTCOMMAND \
+	"mmcboot=echo Booting from mmc ...; " \
 		"if mmc rescan; then " \
 			"if run loadbootscript; then " \
 				"run bootscript; " \
@@ -102,12 +87,23 @@
 					"run fitboot; " \
 				"else " \
 					"if run loadimage; then " \
-					"run mmcboot; " \
+						"run _mmcboot; " \
 					"fi; " \
 				"fi; " \
 			"fi; " \
-	"fi"
-#endif
+		"fi\0" \
+	"nandboot=echo Booting from nand ...; " \
+		"if mtdparts; then " \
+			"echo Starting nand boot ...; " \
+		"else " \
+			"mtdparts default; " \
+		"fi; " \
+		"run ubiargs; " \
+		"nand read ${loadaddr} kernel 0x800000; " \
+		"nand read ${fdt_addr} dtb 0x100000; " \
+		"bootm ${loadaddr} - ${fdt_addr}\0"
+
+#define CONFIG_BOOTCOMMAND		"run $modeboot"
 
 /* Miscellaneous configurable options */
 #define CONFIG_SYS_MEMTEST_START	0x80000000