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CAST-32A
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CAST-32A, Multi-core Processors is a position paper,[1] by the Certification Authorities Software Team (CAST). It is not official guidance, but is considered informational by certification authorities such as the FAA and EASA. A key point is that Multi-core processor "interference can affect execution timing behavior, including worst case execution time (WCET)."[2]
 | This article may be too technical for most readers to understand. (August 2021) |
The original document was published in 2014 by an "international group of certification and regulatory authority representatives."[3] The current revision A was released in 2016. "The Federal Aviation Administration (FAA) and European Aviation Safety Agency (EASA) worked with industry to quantify a set of requirements and guidance that should be met to certify and use multi-core processors in civil aviation, described e.g. in the FAA CAST-32A Position Paper and the EASA Use of MULticore proCessORs in airborne Systems (MULCORS) research report."[4] For applicants certifying under EASA, AMC 20-193 has now superseded CAST-32A since its release on 21 January 2022. FAA released its Advisory Circular AC 20-193 guidance in January 2024, which is almost identical to AMC 20-193. [5]
The first mixed-criticality multicore real-time operating system avionics systems was certified in 2021.[6] The objectives of the standard are applicable to software on multicore processors, including the operating system.[7][8] However, the nature of the underlying processor hardware must be examined in detail to identify potential interference channels due to inter-core contention for shared resources.[9] Verification that multicore interference channels have been mitigated can be accomplished through the use of interference generators i.e. software tuned to create a heavy usage pattern on a shared resource.[10]
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Objectives
The paper presents ten objectives that must be met for Design Assurance Level (DAL) A or B. Six of the objectives apply for DAL C. The paper does not apply for DAL D or E. [1]
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References
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