ls3a7a dtb cmdline size limited to 512.

Change-Id: I25710e0ac70c8db3c4b732b4a41c698cf9aa7cae
Signed-off-by: QiaoChong <qiaochong@loongson.cn>

Targets/Bonito3a3000_7a/dev/load_dtb.c

@@ -207,17 +207,19 @@ static int fdt_parse_prop(char * const *newval, int count, char *data, int *len)
 	return 0;
 }
 
+#define COMMAND_LINE_SIZE 512
+
 static int update_bootarg(int ac, char ** av, void * ssp)
 {
 	int i, len = 0, ret;
-	char new_arg[200];
+	char new_arg[COMMAND_LINE_SIZE + 2];
 	char *p;
 	int nodeoffset;
 
 	p = new_arg;
-	for (i = 1; i < ac; i++) {
-		strcpy(p, av[i]);
-		p += strlen(av[i]);
+	for (i = 1; i < ac && new_arg - p < COMMAND_LINE_SIZE; i++) {
+		strncpy(p, av[i], new_arg + COMMAND_LINE_SIZE - p);
+		p += min(strlen(av[i]), new_arg + COMMAND_LINE_SIZE - p);
 		*p = ' ';
 		p++;
 	}