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test/py: add generic CRC32 function
Add a generic function which can be used to compute the CRC32 value of a region of RAM. Signed-off-by: Liam Beguin <liambeguin@gmail.com> Reviewed-by: Stephen Warren <swarren@nvidia.com>
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@ -11,6 +11,7 @@ import os.path
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import pytest
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import sys
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import time
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import re
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def md5sum_data(data):
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"""Calculate the MD5 hash of some data.
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@ -310,3 +311,25 @@ def persistent_file_helper(u_boot_log, filename):
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"""
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return PersistentFileHelperCtxMgr(u_boot_log, filename)
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def crc32(u_boot_console, address, count):
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"""Helper function used to compute the CRC32 value of a section of RAM.
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Args:
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u_boot_console: A U-Boot console connection.
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address: Address where data starts.
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count: Amount of data to use for calculation.
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Returns:
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CRC32 value
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"""
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bcfg = u_boot_console.config.buildconfig
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has_cmd_crc32 = bcfg.get('config_cmd_crc32', 'n') == 'y'
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assert has_cmd_crc32, 'Cannot compute crc32 without CONFIG_CMD_CRC32.'
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output = u_boot_console.run_command('crc32 %08x %x' % (address, count))
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m = re.search('==> ([0-9a-fA-F]{8})$', output)
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assert m, 'CRC32 operation failed.'
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return m.group(1)
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