	/* WRSR performs a self-timed erase before the changes take effect.
	 * This may take 50-85 ms in most cases, and some chips apparently
	 * allow running RDSR only once. Therefore pick an initial delay of
	 * 100 ms, then wait in 10 ms steps until a total of 5 s have elapsed.
	 */
	int i = 0;
	programmer_delay(100 * 1000);
	while (spi_read_status_register(flash) & SPI_SR_WIP) {
		if (++i > 490) {
			msg_cerr("Error: WIP bit after WRSR never cleared\n");
			return TIMEOUT_ERROR;
		}
		programmer_delay(10 * 1000);
	}
	return 0;