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# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# Utility functions for flash related test
#
import random
# Fixed random seed.
random.seed(1234)
def get_flash_size(helper):
helper.ec_command("hcflashinfo")
return int(helper.wait_output("flash_size = (?P<f>\d+)", use_re=True)["f"])
def get_ro_size(helper):
helper.ec_command("rosize")
return int(helper.wait_output(
"RO image size = (?P<ro>0x[0-9a-f]+)", use_re=True)["ro"], 16)
def xor_sum(size, seed, mult, add):
ret = 0
for i in xrange(size):
ret ^= (seed & 0xff)
seed = seed * mult + add
return ret
def test_write(helper, offset, size, expect_fail=False):
seed = random.randint(2, 10000)
mult = random.randint(2, 10000)
add = random.randint(2, 10000)
helper.ec_command("hcflashwrite %d %d %d %d %d" %
(offset, size, seed, mult, add))
if expect_fail:
helper.wait_output("Command returned error")
else:
expected_sum = xor_sum(size, seed, mult, add)
helper.wait_output("Flash write at %x size %x XOR %x" %
(offset, size, expected_sum))
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