Diff: patch.py

Revision:

36:96847d42f010

Parent:

35:da9c89f8be7d

Child:

37:f8cfeb185c30

--- a/patch.py	Wed Feb 15 13:53:18 2017 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,50 +0,0 @@
-"""
-mbed SDK
-Copyright (c) 2011-2013 ARM Limited
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-
-
-http://www.nxp.com/documents/user_manual/UM10360.pdf
-
-32.3.1.1 Criterion for Valid User Code
-The reserved Cortex-M3 exception vector location 7 (offset 0x1C in the vector table)
-should contain the 2's complement of the check-sum of table entries 0 through 6. This
-causes the checksum of the first 8 table entries to be 0. The boot loader code checksums
-the first 8 locations in sector 0 of the flash. If the result is 0, then execution control is
-transferred to the user code.
-"""
-from struct import unpack, pack
-
-
-def patch(bin_path):
-    with open(bin_path, 'r+b') as bin:
-        # Read entries 0 through 6 (Little Endian 32bits words)
-        vector = [unpack('<I', bin.read(4))[0] for _ in range(7)]
-
-        # location 7 (offset 0x1C in the vector table) should contain the 2's
-        # complement of the check-sum of table entries 0 through 6
-        bin.seek(0x1C)
-        bin.write(pack('<I', (~sum(vector) + 1) & 0xFFFFFFFF))
-
-
-def is_patched(bin_path):
-    with open(bin_path, 'rb') as bin:
-        # The checksum of the first 8 table entries should be 0
-        return (sum([unpack('<I', bin.read(4))[0] for _ in range(8)]) & 0xFFFFFFFF) == 0
-
-
-if __name__ == '__main__':
-    bin_path = "C:/Users/emimon01/releases/emilmont/build/test/LPC1768/ARM/MBED_A1/basic.bin"
-    patch(bin_path)
-    assert is_patched(bin_path), "The file is not patched"