241     def readback(self, offset, length, spi_connection=None):  member in EsptoolTestCase
262     def diff(self, readback, compare_to):  argument
263         for rb_b, ct_b, offs in zip(readback, compare_to, range(len(readback))):
271         rb = self.readback(offset, length, spi_connection)
490         three_sectors = self.readback(0, 0x3000)
1017         empty = self.readback(0x10000, 0x400)
1028         empty = self.readback(0x10000, 0x1000)
1154         readback = self.readback(self.flash_offset, 8)
1155         assert self.header[:3] == readback[:3]  # first 3 bytes unchanged
1156         assert self.header[3] != readback[3]  # size_freq byte changed
1157         assert self.header[4:] == readback[4:]  # rest unchanged
1169         readback = self.readback(self.flash_offset, 8)
1170         assert self.header[0] == readback[0]
1171         assert self.header[1] == readback[1]
1172         assert (0x3F if arg_chip == "esp8266" else 0x1F) == readback[3]  # size_freq
1175         assert 3 == readback[2]  # value in flash is dout mode
1177         assert self.header[3] != readback[3]  # size/freq values have changed
1178         assert self.header[4:] == readback[4:]  # entrypoint address hasn't changed