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Our customer has a question pertaining to the implementation of SM_070 (section 5.6.12.1) for the S32K148: "Recommendation: For checking the content of safety relevant configuration registers a CRC check as described below can be used. If the CRC method to check configuration register is not feasible, an alternative register check can be implemented, like read configuration registers and check against expected value." In each module there are many configuration registers that are not contiguous. In addition, many configuration registers are mixed up with status registers, meaning that for almost all configuration registers, some status bits would need to be removed from the register to be capable of calculating the configuration CRC. Questions: Since the configuration registers are not always contiguous and are often mixed with status registers, how is it possible to be effective with the CRC module (for example FTM and ADC)? Is there a different approach that should be taken?
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Hello, our customer has a couple of questions pertaining the last implementation hint of SM_101 for S32K148: "A checksum may be calculated on safety-critical data at the source prior to transfer, then recalculated at the destination after transfer." Q1: How does CRC calculation help with the detection of spurious, excessive, or constant activation? What is the link here? Some of our safety-critical data is generated by the ADC module. This data is copied to RAM by the eDMA, which is later on retrieved and used by our code. If we would like to add a CRC to the ADC result data, we would need our C code to access the raw ADC data, meaning that the eDMA would not really be relevant anymore. Q2: How can this implementation hint be compatible with the MCAL implementation of the ADC module?
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Once the safety manual is updated to 6.0, there is additional comment like below. [Questions] What does it the aforementioned system level checks? It is more like E2E protection? If not, can you specify which system level safety measures shall be used?
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Once the safety manual is updated to 6.0, there are some comments for configuration as below in the red box. Is it only information or what should the user do for this?
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The following is an assumption requirement from safety manual 6.0 for 32k388. for e), the application shall trigger timer or is there any dedicated timer for AES eviction?
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