imx: ventana: make hwconfig initialize based on board configuration

The hwconfig env var allows user to control hardware specific configuration
of board specific features but not all Ventana boards have the same features.

We will use the magic default value of "_UNKNOWN_" to signify that the
bootloader should create this based on detected board model.
Signed-off-by: NTim Harvey <tharvey@gateworks.com>

board/gateworks/gw_ventana/gw_ventana.c

@@ -700,13 +700,14 @@ static const struct boot_mode board_boot_modes[] = {
 int misc_init_r(void)
 {
 	struct ventana_board_info *info = &ventana_info;
+	char buf[256];
+	int i;
 
 	/* set env vars based on EEPROM data */
 	if (ventana_info.model[0]) {
 		char str[16], fdt[36];
 		char *p;
 		const char *cputype = "";
-		int i;
 
 		/*
 		 * FDT name will be prefixed with CPU type.  Three versions
@@ -769,6 +770,19 @@ int misc_init_r(void)
 		setenv("mem_mb", str);
 	}
 
+	/* Set a non-initialized hwconfig based on board configuration */
+	if (!strcmp(getenv("hwconfig"), "_UNKNOWN_")) {
+		sprintf(buf, "hwconfig=");
+		if (gpio_cfg[board_type].rs232_en)
+			strcat(buf, "rs232;");
+		for (i = 0; i < gpio_cfg[board_type].dio_num; i++) {
+			char buf1[32];
+			sprintf(buf1, "dio%d:mode=gpio;", i);
+			if (strlen(buf) + strlen(buf1) < sizeof(buf))
+				strcat(buf, buf1);
+		}
+		setenv("hwconfig", buf);
+	}
 
 	/* setup baseboard specific GPIO based on board and env */
 	setup_board_gpio(board_type, info);

include/configs/gw_ventana.h

@@ -271,16 +271,13 @@
 /* Environment */
 #define CONFIG_IPADDR             192.168.1.1
 #define CONFIG_SERVERIP           192.168.1.146
-#define HWCONFIG_DEFAULT \
-	"hwconfig=rs232;" \
-	"dio0:mode=gpio;dio1:mode=gpio;dio2:mode=gpio;dio3:mode=gpio\0" \
 
 #define CONFIG_EXTRA_ENV_SETTINGS_COMMON \
 	"pcidisable=1\0" \
 	"usb_pgood_delay=2000\0" \
 	"console=ttymxc1\0" \
 	"bootdevs=usb mmc sata flash\0" \
-	HWCONFIG_DEFAULT \
+	"hwconfig=_UNKNOWN_\0" \
 	"video=\0" \
 	\
 	"mtdparts=" MTDPARTS_DEFAULT "\0" \