T43 Dissasembly

[hjtrbo]

Address workbook has been updated to v1 in the first post.

[hjtrbo]

Attached mode 6 OBD diag doc variant 7 for MYD 2014 Camaro / CTS-V (Same as VF HSV)

[hjtrbo]

Any help with checksum calcs would be appreciated.

I'm just concentrating on the trans segment for now. I've found a few functions that sent me down a rabbit hole, however I'm yet to work out how the checksum is verified which would then tell me how it is calculated.

Side note, if you set the first byte after the 2nd checksum location to 1 in the trans segment, checksum verification is disabled as reported by efilive.

[gmtech825]

universal patcher has the checksum calcs figured out for you already. see the t43 xml

[hjtrbo]

Thanks gm. This software continues to amaze me.

[hjtrbo]

Fuck UPatcher is the shiz dizzle!

Trans segment range: 1C0000 - 1FCB57
CS1 offset = 0x0
CS2 offset = 0x1c
CS length = 2 bytes

With both CS set to 0x0: Segment is CRC16. Result is byte swapped and written to CS2. Then entire segment is word summed (incl. the newly calc'd CS2), 2's compliment and written to CS1.

My next move is to give back to the UP team and define what I have so far into an xdf => xml for this OS. About 90% of the HP def with every table needed to get a good tune up and running.

[hjtrbo]

xdf uploaded. Corresponding hpt tune attached which you can use to cross reference if needed.

Edit: 31/12/23 xdf updated to v1
Removed universal patcher xml, awaiting information on xdf import for row major and minor stride settings.

Edit: 03/01/24 xdf updated to v2
Added checksum dll


Edit: 03/01/24
As per @antus, hold my beer

Edit: 03/01/24
Fixed up uuid. Please delete earlier copies of the xdf and dll
xdf is v3. dll is v0.1

[Tazzi]

Fuck UPatcher is the shiz dizzle!

Trans segment range: 1C0000 - 1FCB57
CS1 offset = 0x0
CS2 offset = 0x1c
CS length = 2 bytes

With both CS set to 0x0: Segment is CRC16. Result is byte swapped and written to CS2. Then entire segment is word summed (incl. the newly calc'd CS2), 2's compliment and written to CS1.

My next move is to give back to the UP team and define what I have so far into an xdf => xml for this OS. About 90% of the HP def with every table needed to get a good tune up and running.

Making some great progress!! Fucking awesome work!

[hjtrbo]

I built this handy little utility to help me. It speeds up analysis considerably. Pictures describe usage.
As is the case when one builds there own tools, the usual quirks and bugs apply. If anyone wants to improve on it, knock yourselves out. Send me back what you've done.

Parse data table out to array

HBDISiq.png (67.65 KiB) Viewed 854 times

Convert hex array into a scaled table. 1D and 2D supported. Auto detect of table size by GM length bytes supported

mecsGM1.png (130.9 KiB) Viewed 853 times

Parse out an assembly function to minimal text to simplify analysis

[hjtrbo]

[youtube][/youtube]