fdt_setprop_string
return fdt_setprop_string(fdt, offset, property, string);
err = fdt_setprop_string(fdt, mem_off, "device_type", "memory");
err = fdt_setprop_string(fdt, chosen_off, "stdout-path", path);
err = fdt_setprop_string(fdt, chosen_off, "bootargs", fw_getcmdline());
err = fdt_setprop_string(fdt, mem_off, "device_type", "memory");
ret = fdt_setprop_string(fdt, chosen_node, "bootargs", cmdline);