cmd: env: add env load command

Add the new command env load to load the environment from
the current location gd->env_load_prio.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

cmd/Kconfig

@@ -604,6 +604,12 @@ config CMD_NVEDIT_INFO
 	  [-q] : quiet output
 	  The result of multiple evaluations will be combined with AND.
 
+config CMD_NVEDIT_LOAD
+	bool "env load"
+	help
+	  Load all environment variables from the compiled-in persistent
+	  storage.
+
 endmenu
 
 menu "Memory commands"

cmd/nvedit.c

@@ -794,6 +794,14 @@ U_BOOT_CMD(
 );
 #endif
 #endif
+
+#if defined(CONFIG_CMD_NVEDIT_LOAD)
+static int do_env_load(struct cmd_tbl *cmdtp, int flag, int argc,
+		       char *const argv[])
+{
+	return env_reload() ? 1 : 0;
+}
+#endif
 #endif /* CONFIG_SPL_BUILD */
 
 int env_match(uchar *s1, int i2)
@@ -1346,6 +1354,9 @@ static struct cmd_tbl cmd_env_sub[] = {
 #endif
 #if defined(CONFIG_CMD_NVEDIT_INFO)
 	U_BOOT_CMD_MKENT(info, 3, 0, do_env_info, "", ""),
+#endif
+#if defined(CONFIG_CMD_NVEDIT_LOAD)
+	U_BOOT_CMD_MKENT(load, 1, 0, do_env_load, "", ""),
 #endif
 	U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
 #if defined(CONFIG_CMD_RUN)
@@ -1442,6 +1453,9 @@ static char env_help_text[] =
 	"env erase - erase environment\n"
 #endif
 #endif
+#if defined(CONFIG_CMD_NVEDIT_LOAD)
+	"env load - load environment\n"
+#endif
 #if defined(CONFIG_CMD_NVEDIT_EFI)
 	"env set -e [-nv][-bs][-rt][-at][-a][-i addr,size][-v] name [arg ...]\n"
 	"    - set UEFI variable; unset if '-i' or 'arg' not specified\n"

env/env.c

@@ -230,6 +230,34 @@ int env_load(void)
 	return -ENODEV;
 }
 
+int env_reload(void)
+{
+	struct env_driver *drv;
+
+	drv = env_driver_lookup(ENVOP_LOAD, gd->env_load_prio);
+	if (drv) {
+		int ret;
+
+		printf("Loading Environment from %s... ", drv->name);
+
+		if (!env_has_inited(drv->location)) {
+			printf("not initialized\n");
+			return -ENODEV;
+		}
+
+		ret = drv->load();
+		if (ret)
+			printf("Failed (%d)\n", ret);
+		else
+			printf("OK\n");
+
+		if (!ret)
+			return 0;
+	}
+
+	return -ENODEV;
+}
+
 int env_save(void)
 {
 	struct env_driver *drv;

include/env.h

@@ -265,6 +265,13 @@ int env_set_default_vars(int nvars, char *const vars[], int flags);
  */
 int env_load(void);
 
+/**
+ * env_reload() - Re-Load the environment from current storage
+ *
+ * @return 0 if OK, -ve on error
+ */
+int env_reload(void);
+
 /**
  * env_save() - Save the environment to storage
  *