[U-Boot,v3,6/7] test/py: add generic CRC32 function

Message ID 20180314020307.23475-7-liambeguin@gmail.com
State Superseded
Delegated to: Tom Rini
Headers show
Series
  • [U-Boot,v3,1/7] spi: spi_flash: do not fail silently on bad user input
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Commit Message

Liam Beguin March 14, 2018, 2:03 a.m.
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>
---
 test/py/u_boot_utils.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

Patch

diff --git a/test/py/u_boot_utils.py b/test/py/u_boot_utils.py
index 64584494e463..de9ee2643f51 100644
--- a/test/py/u_boot_utils.py
+++ b/test/py/u_boot_utils.py
@@ -11,6 +11,7 @@  import os.path
 import pytest
 import sys
 import time
+import re
 
 def md5sum_data(data):
     """Calculate the MD5 hash of some data.
@@ -310,3 +311,25 @@  def persistent_file_helper(u_boot_log, filename):
     """
 
     return PersistentFileHelperCtxMgr(u_boot_log, filename)
+
+def crc32(u_boot_console, address, count):
+    """Helper function used to compute the CRC32 value of a section of RAM.
+
+    Args:
+        u_boot_console: A U-Boot console connection.
+        address: Address where data starts.
+        count: Amount of data to use for calculation.
+
+    Returns:
+        CRC32 value
+    """
+
+    bcfg = u_boot_console.config.buildconfig
+    has_cmd_crc32 = bcfg.get('config_cmd_crc32', 'n') == 'y'
+    assert has_cmd_crc32, 'Cannot compute crc32 without CONFIG_CMD_CRC32.'
+    output = u_boot_console.run_command('crc32 %08x %x' % (address, count))
+
+    m = re.search('==> ([0-9a-fA-F]{8})$', output)
+    assert m, 'CRC32 operation failed.'
+
+    return m.group(1)