pxe: add support for ontimeout token

ontimeout is similar to default, but is the selection on menu timeout.
This is how cobbler sets a default. The label default is supposed to be
the default selection when <enter> is pressed. If both default and
ontimeout are set, last one parsed wins.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>

common/cmd_pxe.c

@@ -672,6 +672,7 @@ enum token_type {
 	T_PROMPT,
 	T_INCLUDE,
 	T_FDT,
+	T_ONTIMEOUT,
 	T_INVALID
 };
 
@@ -700,6 +701,7 @@ static const struct token keywords[] = {
 	{"initrd", T_INITRD},
 	{"include", T_INCLUDE},
 	{"fdt", T_FDT},
+	{"ontimeout", T_ONTIMEOUT,},
 	{NULL, T_INVALID}
 };
 
@@ -997,9 +999,7 @@ static int parse_label_menu(char **c, struct pxe_menu *cfg,
 
 	switch (t.type) {
 	case T_DEFAULT:
-		if (cfg->default_label)
-			free(cfg->default_label);
-
+		if (!cfg->default_label)
 			cfg->default_label = strdup(label->name);
 
 		if (!cfg->default_label)
@@ -1159,6 +1159,7 @@ static int parse_pxefile_top(char *p, struct pxe_menu *cfg, int nest_level)
 			break;
 
 		case T_DEFAULT:
+		case T_ONTIMEOUT:
 			err = parse_sliteral(&p, &label_name);
 
 			if (label_name) {