mx6cuboxi: Load the correct 'fdtfile' variable

Instead of hardcoding the 'fdtfile' variable, let's detect the SoC and
board variant on the fly and change the dtb name.

Based on the scheme done on am335x board.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Tested-By: Vagrant Cascadian <vagrant@debian.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

board/solidrun/mx6cuboxi/mx6cuboxi.c

@@ -212,6 +212,31 @@ int checkboard(void)
 	return 0;
 }
 
+static bool is_mx6q(void)
+{
+	if (is_cpu_type(MXC_CPU_MX6Q) || is_cpu_type(MXC_CPU_MX6D))
+		return true;
+	else
+		return false;
+}
+
+int board_late_init(void)
+{
+#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
+	if (is_hummingboard())
+		setenv("board_name", "HUMMINGBOARD");
+	else
+		setenv("board_name", "CUBOXI");
+
+	if (is_mx6q())
+		setenv("board_rev", "MX6Q");
+	else
+		setenv("board_rev", "MX6DL");
+#endif
+
+	return 0;
+}
+
 #ifdef CONFIG_SPL_BUILD
 #include <asm/arch/mx6-ddr.h>
 static const struct mx6dq_iomux_ddr_regs mx6q_ddr_ioregs = {

include/configs/mx6cuboxi.h

@@ -29,6 +29,7 @@
 
 #define CONFIG_SYS_MALLOC_LEN		(2 * SZ_1M)
 #define CONFIG_BOARD_EARLY_INIT_F
+#define CONFIG_BOARD_LATE_INIT
 #define CONFIG_MXC_GPIO
 #define CONFIG_MXC_UART
 #define CONFIG_CMD_FUSE
@@ -81,14 +82,14 @@
 #define CONFIG_MXC_UART_BASE	UART1_BASE
 #define CONFIG_CONSOLE_DEV	"ttymxc0"
 #define CONFIG_MMCROOT		"/dev/mmcblk0p2"
-#define CONFIG_DEFAULT_FDT_FILE	"imx6q-hummingboard.dtb"
 #define CONFIG_SYS_FSL_USDHC_NUM	1
 #define CONFIG_SYS_MMC_ENV_DEV		0	/* SDHC2 */
 
+#define CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"script=boot.scr\0" \
 	"image=zImage\0" \
-	"fdtfile=" CONFIG_DEFAULT_FDT_FILE "\0" \
+	"fdtfile=undefined\0" \
 	"fdt_addr_r=0x18000000\0" \
 	"boot_fdt=try\0" \
 	"ip_dyn=yes\0" \
@@ -156,9 +157,21 @@
 			"fi; " \
 		"else " \
 			"bootz; " \
-		"fi;\0"
+		"fi;\0" \
+	"findfdt="\
+		"if test $board_name = HUMMINGBOARD && test $board_rev = MX6Q ; then " \
+			"setenv fdtfile imx6q-hummingboard.dtb; fi; " \
+		"if test $board_name = HUMMINGBOARD && test $board_rev = MX6DL ; then " \
+			"setenv fdtfile imx6dl-hummingboard.dtb; fi; " \
+		"if test $board_name = CUBOXI && test $board_rev = MX6Q ; then " \
+			"setenv fdtfile imx6q-cubox-i.dtb; fi; " \
+		"if test $board_name = CUBOXI && test $board_rev = MX6DL ; then " \
+			"setenv fdtfile imx6dl-cubox-i.dtb; fi; " \
+		"if test $fdtfile = undefined; then " \
+			"echo WARNING: Could not determine dtb to use; fi; \0" \
 
 #define CONFIG_BOOTCOMMAND \
+	"run findfdt; " \
 	"mmc dev ${mmcdev};" \
 	"if mmc rescan; then " \
 		"if run loadbootscript; then " \