env: Always use char for default_environment

Sometimes we use uchar and sometimes char for the default environment
array. By always using char, we can get rid of some explicit casts.
Signed-off-by: NMarek Behún <marek.behun@nic.cz>
Reviewed-by: NSimon Glass <sjg@chromium.org>

board/Marvell/mvebu_armada-37xx/board.c

@@ -87,7 +87,7 @@ int board_init(void)
 #ifdef CONFIG_BOARD_LATE_INIT
 int board_late_init(void)
 {
-	char *ptr = (char *)&default_environment[0];
+	char *ptr = &default_environment[0];
 	struct udevice *dev;
 	struct mmc *mmc_dev;
 	bool ddr4, emmc;

env/common.c

@@ -162,7 +162,7 @@ int env_get_f(const char *name, char *buf, unsigned len)
 	name_len = strlen(name);
 
 	if (gd->env_valid == ENV_INVALID)
-		env = (const char *)default_environment;
+		env = default_environment;
 	else
 		env = (const char *)gd->env_addr;
 
@@ -264,7 +264,7 @@ void env_set_default(const char *s, int flags)
 	}
 
 	flags |= H_DEFAULT;
-	if (himport_r(&env_htab, (char *)default_environment,
+	if (himport_r(&env_htab, default_environment,
 			sizeof(default_environment), '\0', flags, 0,
 			0, NULL) == 0)
 		pr_err("## Error: Environment import failed: errno = %d\n",
@@ -283,7 +283,7 @@ int env_set_default_vars(int nvars, char * const vars[], int flags)
 	 * (and use \0 as a separator)
 	 */
 	flags |= H_NOCLEAR | H_DEFAULT;
-	return himport_r(&env_htab, (const char *)default_environment,
+	return himport_r(&env_htab, default_environment,
 				sizeof(default_environment), '\0',
 				flags, 0, nvars, vars);
 }

include/env_default.h

@@ -20,9 +20,9 @@ env_t embedded_environment __UBOOT_ENV_SECTION__(environment) = {
 #elif defined(DEFAULT_ENV_INSTANCE_STATIC)
 static char default_environment[] = {
 #elif defined(DEFAULT_ENV_IS_RW)
-uchar default_environment[] = {
+char default_environment[] = {
 #else
-const uchar default_environment[] = {
+const char default_environment[] = {
 #endif
 #ifndef CONFIG_USE_DEFAULT_ENV_FILE
 #ifdef	CONFIG_ENV_CALLBACK_LIST_DEFAULT

include/env_internal.h

@@ -112,9 +112,9 @@ extern env_t embedded_environment;
 #endif /* ENV_IS_EMBEDDED */
 
 #ifdef DEFAULT_ENV_IS_RW
-extern unsigned char default_environment[];
+extern char default_environment[];
 #else
-extern const unsigned char default_environment[];
+extern const char default_environment[];
 #endif
 
 #ifndef DO_DEPS_ONLY