Disassembling Simtec 75.5

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Topic: Disassembling Simtec 75.5 (Read 14325 times)

Georg_Jung

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	Disassembling Simtec 75.5 « on: December 26, 2015, 02:29:20 PM »

Hi everybody,

I did the same (http://www.andywhittaker.com/disassemble-a-bosch-me7-1-ecu/)
1. Load lower 64K of ECU stock file to 0x0000
2. Create 64K of RAM at DPP1
3. Load the rest of ECU stock file to DPP2
4. Set DPP0 = 1Сh, DPP1 = 10h, DPP2 = 24h.
How to properly install the load address ?

I would appreciate any help.
Do not judge strictly. I'm a beginner at this.
Thanks in advance.


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Georg_Jung

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	Re: Disassembling Simtec 75.5 « Reply #1 on: December 26, 2015, 02:36:12 PM »

Sorry! It is impossible to attach a draft (IDA).
(Your attachment couldn't be saved. This might happen because it took too long to upload or the file is bigger than the server will allow.)


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Cloudforce

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	Re: Disassembling Simtec 75.5 « Reply #2 on: December 27, 2015, 02:33:01 AM »

Simtec is probably from Siemens and most probably very different from Bosch ecu. Even if the processor and flash is the very same, the structure, layout ect is going to be way different.

Upload the untouched 512kb file please.

(edit)

I build the 512kb file from your stuff and surprisingly it looks pretty equal to Siemens EMS2000 ecu Wink

You may wanna take a look at what we found for it:

http://nefariousmotorsports.com/forum/index.php?topic=9441.0title=


« Last Edit: December 27, 2015, 02:37:36 AM by Cloudforce »	Logged

dream3R

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	Re: Disassembling Simtec 75.5 « Reply #3 on: December 27, 2015, 01:13:18 PM »

Post the full file and I'll give you the DPP's


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How to work out values from an A2L

http://nefariousmotorsports.com/forum/index.php?topic=5525.msg52371#msg52371

Starting Rev's http://nefariousmotorsports.com/forum/index.php?topic=5397.msg51169#msg51169

noobs read this before asking http://nefariousmotorsports.com/forum/index.php?topic=9014.0title=

ORGORIGINAL 05 5120 creator for Volvo
ORIGINAL Datalogger (Freeware) Author
ORGINAL finder of the 'extra' torque' limits
I don't have ME7.01 A2L I just use ID

Cloudforce

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	Re: Disassembling Simtec 75.5 « Reply #4 on: December 27, 2015, 04:32:00 PM »


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dream3R

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	Re: Disassembling Simtec 75.5 « Reply #5 on: December 27, 2015, 07:06:37 PM »

It's late here laptop off but will tomorrow hopefully or well need a minimon read lol.

Btw the file labelled rom isn't.


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dream3R

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	Re: Disassembling Simtec 75.5 « Reply #6 on: December 28, 2015, 01:00:25 AM »

That means crack minimon out btw read the cpu code or if u have an a2l I can calculate it


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Georg_Jung

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	Re: Disassembling Simtec 75.5 « Reply #7 on: December 28, 2015, 02:52:49 PM »

Hi everybody.
Thank you for your answers.
Apologies for the delay in replying.
processor C167CS-LM
flash AM29F400BB


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Cloudforce

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	Re: Disassembling Simtec 75.5 « Reply #8 on: December 28, 2015, 02:58:37 PM »

It disassembles quite nice

You probably don´t have access to a damos or a2l file for it?


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Georg_Jung

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	Re: Disassembling Simtec 75.5 « Reply #9 on: December 29, 2015, 05:03:27 AM »

Yes. Unfortunately I have no files(damos, a2l).
I do so:
- load 512kb file (processor type c166)
- create rom section default (start 0x0, size 80000)
- choose yhe device name c167cs
-

How to properly install the load address ?
Thanks in advance.


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dream3R

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	Re: Disassembling Simtec 75.5 « Reply #10 on: December 30, 2015, 06:42:34 PM »

DPPs are in the last pic. Load location is done by a register check the sheet.


« Last Edit: December 30, 2015, 06:44:47 PM by dream3R »	Logged

How to work out values from an A2L

Georg_Jung

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	Re: Disassembling Simtec 75.5 « Reply #11 on: December 31, 2015, 08:55:24 AM »

Thank you for your answer.
That's right ?


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dream3R

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	Re: Disassembling Simtec 75.5 « Reply #12 on: December 31, 2015, 11:31:56 AM »

Quote from: Georg_Jung on December 31, 2015, 08:55:24 AM

Thank you for your answer.
That's right ?

Yup well done. Remember DPPs can be overridden in the code extp is the instruction iirc. It's probably worth reading the instruction set manual as well.


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Georg_Jung

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	Re: Disassembling Simtec 75.5 « Reply #13 on: March 31, 2016, 01:10:46 PM »

Hi everybody.
Was a lot of work.
I used the plugin by Andy.
Poorly Grin

(plugin converted into code MEM_EXT)
I'm looking for an algorithm seed-key.
It is not found Grin

Maybe it does not exist in the firmware?


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dream3R

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	Re: Disassembling Simtec 75.5 « Reply #14 on: May 02, 2016, 07:28:12 PM »

Quote from: Georg_Jung on March 31, 2016, 01:10:46 PM

Hi everybody.
Was a lot of work.
I used the plugin by Andy.
Poorly Grin

(plugin converted into code MEM_EXT)
I'm looking for an algorithm seed-key.
It is not found Grin

Maybe it does not exist in the firmware?

it will involve xor instructions, no doubt lol.


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How to work out values from an A2L

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