imx: mx6sabresd/sabreauto runtime setting fdt_file

Detect the SOC and board variant at runtime and change the dtb name,
but not hardcoding the fdt_file env variable.

Take the following patch as a reference.
Íd58699b157df75f1aa0b363ea9c21add21a0c
"mx6cuboxi: Load the correct 'fdtfile' variable"
Signed-off-by: NPeng Fan <Peng.Fan@freescale.com>
Reviewed-by: NFabio Estevam <fabio.estevam@freescale.com>
Acked-by: NStefano Babic <sbabic@denx.de>

board/freescale/mx6qsabreauto/mx6qsabreauto.c

@@ -522,6 +522,15 @@ int board_late_init(void)
 	add_board_boot_modes(board_boot_modes);
 #endif
 
+#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
+	setenv("board_name", "SABREAUTO");
+
+	if (is_cpu_type(MXC_CPU_MX6Q) || is_cpu_type(MXC_CPU_MX6D))
+		setenv("board_rev", "MX6Q");
+	else if (is_cpu_type(MXC_CPU_MX6DL) || is_cpu_type(MXC_CPU_MX6SOLO))
+		setenv("board_rev", "MX6DL");
+#endif
+
 	return 0;
 }
 

board/freescale/mx6sabresd/mx6sabresd.c

@@ -680,6 +680,16 @@ int board_late_init(void)
 #ifdef CONFIG_CMD_BMODE
 	add_board_boot_modes(board_boot_modes);
 #endif
+
+#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
+	setenv("board_name", "SABRESD");
+
+	if (is_cpu_type(MXC_CPU_MX6Q) || is_cpu_type(MXC_CPU_MX6D))
+		setenv("board_rev", "MX6Q");
+	else if (is_cpu_type(MXC_CPU_MX6DL) || is_cpu_type(MXC_CPU_MX6SOLO))
+		setenv("board_rev", "MX6DL");
+#endif
+
 	return 0;
 }
 

include/configs/mx6qsabreauto.h

@@ -12,11 +12,6 @@
 #define CONFIG_MACH_TYPE	3529
 #define CONFIG_MXC_UART_BASE	UART4_BASE
 #define CONFIG_CONSOLE_DEV		"ttymxc3"
-#if defined CONFIG_MX6Q
-#define CONFIG_DEFAULT_FDT_FILE	"imx6q-sabreauto.dtb"
-#elif defined CONFIG_MX6DL
-#define CONFIG_DEFAULT_FDT_FILE	"imx6dl-sabreauto.dtb"
-#endif
 #define CONFIG_MMCROOT			"/dev/mmcblk0p2"
 #define PHYS_SDRAM_SIZE		(2u * 1024 * 1024 * 1024)
 

include/configs/mx6sabre_common.h

@@ -70,10 +70,12 @@
 #define EMMC_ENV ""
 #endif
 
+#define CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
+
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"script=boot.scr\0" \
 	"image=zImage\0" \
-	"fdt_file=" CONFIG_DEFAULT_FDT_FILE "\0" \
+	"fdt_file=undefined\0" \
 	"fdt_addr=0x18000000\0" \
 	"boot_fdt=try\0" \
 	"ip_dyn=yes\0" \
@@ -143,9 +145,24 @@
 			"fi; " \
 		"else " \
 			"bootz; " \
-		"fi;\0"
+		"fi;\0" \
+		"findfdt="\
+			"if test $fdt_file = undefined; then " \
+				"if test $board_name = SABREAUTO && test $board_rev = MX6Q; then " \
+					"setenv fdt_file imx6q-sabreauto.dtb; fi; " \
+				"if test $board_name = SABREAUTO && test $board_rev = MX6DL; then " \
+					"setenv fdt_file imx6dl-sabreauto.dtb; fi; " \
+				"if test $board_name = SABRESD && test $board_rev = MX6Q; then " \
+					"setenv fdt_file imx6q-sabresd.dtb; fi; " \
+				"if test $board_name = SABRESD && test $board_rev = MX6DL; then " \
+					"setenv fdt_file imx6dl-sabresd.dtb; fi; " \
+				"if test $fdt_file = undefined; then " \
+					"echo WARNING: Could not determine dtb to use; fi; " \
+			"fi;\0" \
+
 
 #define CONFIG_BOOTCOMMAND \
+	"run findfdt;" \
 	"mmc dev ${mmcdev};" \
 	"if mmc rescan; then " \
 		"if run loadbootscript; then " \

include/configs/mx6sabresd.h

@@ -19,11 +19,6 @@
 #define CONFIG_MXC_UART_BASE	UART1_BASE
 #define CONFIG_CONSOLE_DEV		"ttymxc0"
 #define CONFIG_MMCROOT			"/dev/mmcblk1p2"
-#if defined(CONFIG_MX6Q)
-#define CONFIG_DEFAULT_FDT_FILE	"imx6q-sabresd.dtb"
-#elif defined(CONFIG_MX6DL)
-#define CONFIG_DEFAULT_FDT_FILE	"imx6dl-sabresd.dtb"
-#endif
 #define PHYS_SDRAM_SIZE		(1u * 1024 * 1024 * 1024)
 
 #define CONFIG_SUPPORT_EMMC_BOOT /* eMMC specific */