Auto-elect
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« on: January 16, 2022, 08:54:21 AM »
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Hello,
want to know the type of EEprom CRC algo used in Siemens/Continental TC176X CPU tricores.
I didn't find too much info, but what I noticed while using the RET software (I analyzed dozens of dumps):
* there are not many blocks that have a valid CRC (3 at most according to the dumps I tested).
* the size of the data covered by the crc is quite large 0x1600 bytes.
considering the size, I think the algo must be a CRC 32, but they only take half of it (16 bits).
It remains to determine the initial value, and the exact size of the data.
Here is an example (file attached): Sid 305.
00001800 70 39 00 00 01 00 3B 4D 6F AF F3 AD E4 1E B7 32
00001900 ....................................................................
. ....................................................................
. ....................................................................
. ....................................................................
. ....................................................................
. ....... .............................................................
00002DF0 00 00 00 00 00 00 00 00 31 0F 82 B3 8F C6 FF FF
In this example there is only one block with valid CRC
Block ID 00003970
Size : 0x1600 bytes : 0x1800---0x02DFF
CRC : 82 B3
I tried several CRC 32 and CRC16 algorithms,but without success,
If anyone has any info please share.
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« Last Edit: January 16, 2022, 08:58:00 AM by Auto-elect »
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