cmd: env: add -nv option for UEFI non-volatile variable

With this option, -nv, at "setenv -e" command, a variable will be defined
as non-volatile.
Signed-off-by: NAKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>

cmd/nvedit.c

@@ -1344,8 +1344,9 @@ U_BOOT_CMD_COMPLETE(
 	setenv, CONFIG_SYS_MAXARGS, 0,	do_env_set,
 	"set environment variables",
 #if defined(CONFIG_CMD_NVEDIT_EFI)
-	"-e name [value ...]\n"
+	"-e [-nv] name [value ...]\n"
 	"    - set UEFI variable 'name' to 'value' ...'\n"
+	"      'nv' option makes the variable non-volatile\n"
 	"    - delete UEFI variable 'name' if 'value' not specified\n"
 #endif
 	"setenv [-f] name value ...\n"

cmd/nvedit_efi.c

@@ -349,6 +349,7 @@ int do_env_set_efi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	u16 *var_name16 = NULL, *p;
 	size_t len;
 	efi_guid_t guid;
+	u32 attributes;
 	efi_status_t ret;
 
 	if (argc == 1)
@@ -362,6 +363,16 @@ int do_env_set_efi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		return CMD_RET_FAILURE;
 	}
 
+	attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS |
+		     EFI_VARIABLE_RUNTIME_ACCESS;
+	if (!strcmp(argv[1], "-nv")) {
+		attributes |= EFI_VARIABLE_NON_VOLATILE;
+		argc--;
+		argv++;
+		if (argc == 1)
+			return CMD_RET_SUCCESS;
+	}
+
 	var_name = argv[1];
 	if (argc == 2) {
 		/* delete */
@@ -391,9 +402,7 @@ int do_env_set_efi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	utf8_utf16_strncpy(&p, var_name, len + 1);
 
 	guid = efi_global_variable_guid;
-	ret = EFI_CALL(efi_set_variable(var_name16, &guid,
-					EFI_VARIABLE_BOOTSERVICE_ACCESS |
-					EFI_VARIABLE_RUNTIME_ACCESS,
+	ret = EFI_CALL(efi_set_variable(var_name16, &guid, attributes,
 					size, value));
 	if (ret == EFI_SUCCESS) {
 		ret = CMD_RET_SUCCESS;