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Siemens MS41: Difference between revisions
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* tbd (not flashable) | * tbd (not flashable) | ||
* Intel AM28F200BB (flashable) | * Intel AM28F200BB (flashable) | ||
The most common ones are equipped with the 2megabit Intel AB28F200BB flash memory. This ECU | The most common ones are equipped with the 2megabit Intel AB28F200BB flash memory. | ||
This ECU came in three different subversions and each of them was intented to run a different engine or emissions class: | |||
*'''MS41.0:''' M52 | |||
*'''MS41.1:''' M52 OBDII | |||
*'''MS41.2:''' S52 US | |||
When looking at the cryptic item names this might help you: [[Siemens Keyword Translation]] | When looking at the cryptic item names this might help you: [[Siemens Keyword Translation]] | ||
<div style="float:right;">__TOC__</div> | <div style="float:right;">__TOC__</div> | ||
=Memory Layout= | =Memory Layout= | ||
MS41 can be seperated into three major sections, the bootloader, the program code, and the calibration data. | |||
'''Bootloader Section''' | '''Bootloader Section''' | ||
The bootloader code section is the most important section of the | The bootloader code section is the most important section of the MS41 and doesnt have to be touched for at least 99% of all use cases. | ||
This section is | This section is 32kB in size and contains the interrupt setups, input and output initializations, as well as immobilizer information and the UIF (user information fields). | ||
The significant difference between the bootloader section and the others is, that it's only one time programmable under normal operation. That means once a byte has been changed from FF to another value, it is not changeable again. | The significant difference between the bootloader section and the others is, that it's only one time programmable under normal operation. That means once a byte has been changed from FF to another value, it is not changeable again. | ||
Unlimited write access to the bootloader section can only be archieved through | Unlimited write access to the bootloader section can only be archieved through desoldering the flash chip and putting it in a chipreader and is ONLY needed for unbricking, virginizing the ECU to pair it with a different EWS module or to alter the UIF without increasing the flashcounter. | ||
'''Programm Code Section''' | '''Programm Code Section''' | ||
The program code section is | The program code section is located after the calibration data and is a 128kByte large section. It stores the program code the ECU uses during normal operation. | ||
'''Calibration Data Section''' | '''Calibration Data Section''' | ||
The calibration data section is | The calibration data section is 24kByte in size and contains all constants and tables. | ||
Latest revision as of 21:51, 19 March 2023
The Siemens MS41 engine control unit (ECU) uses an Infineon C166 CPU clocked at 20MHz and comes in two different memory versions:
- tbd (not flashable)
- Intel AM28F200BB (flashable)
The most common ones are equipped with the 2megabit Intel AB28F200BB flash memory.
This ECU came in three different subversions and each of them was intented to run a different engine or emissions class:
- MS41.0: M52
- MS41.1: M52 OBDII
- MS41.2: S52 US
When looking at the cryptic item names this might help you: Siemens Keyword Translation
Memory Layout
MS41 can be seperated into three major sections, the bootloader, the program code, and the calibration data.
Bootloader Section
The bootloader code section is the most important section of the MS41 and doesnt have to be touched for at least 99% of all use cases.
This section is 32kB in size and contains the interrupt setups, input and output initializations, as well as immobilizer information and the UIF (user information fields).
The significant difference between the bootloader section and the others is, that it's only one time programmable under normal operation. That means once a byte has been changed from FF to another value, it is not changeable again.
Unlimited write access to the bootloader section can only be archieved through desoldering the flash chip and putting it in a chipreader and is ONLY needed for unbricking, virginizing the ECU to pair it with a different EWS module or to alter the UIF without increasing the flashcounter.
Programm Code Section
The program code section is located after the calibration data and is a 128kByte large section. It stores the program code the ECU uses during normal operation.
Calibration Data Section
The calibration data section is 24kByte in size and contains all constants and tables.
