static bool valid_header(char *p, size_t len)
{
	if (len < sizeof(struct fdt_header) ||
	    fdt_magic(p) != FDT_MAGIC ||
	    fdt_version(p) > MAX_VERSION ||
	    fdt_last_comp_version(p) > MAX_VERSION ||
	    fdt_totalsize(p) > len ||
	    fdt_off_dt_struct(p) >= len ||
	    fdt_off_dt_strings(p) >= len)
		return 0;
	else
		return 1;
}