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Comment by yjftsjthsd-h

https://en.wikipedia.org/wiki/L4_microkernel_family seems to describe it having been used all over the place, though mostly in embedded contexts.

> OKL4 shipments exceeded 1.5 billion in early 2012,[4] mostly on Qualcomm wireless modem chips. Other deployments include automotive infotainment systems.[13]

> Apple A series processors beginning with the A7 contain a Secure Enclave coprocessor running an L4 operating system[14] called sepOS (Secure Enclave Processor OS) based on the L4-embedded kernel developed at NICTA in 2006.[15] As a result, L4 ships on all modern Apple devices including Macs with Apple silicon.

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