Run-Time Abstraction Services

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Run-Time Abstraction Services (RTAS) is run-time firmware that provides abstraction to some operating systems.^[1] These include those running on IBM System i and IBM System p computers.

It contrasts with Open Firmware, in that the latter is usually used only during boot, while RTAS is used during run-time.

Later it was renamed to Open Power Abstraction Layer (OPAL), and it's stored in a PNOR (platform NOR) flash memory.

Ppc64-diag, libservicelog, servicelog, and powerpc-utils packages can be used to diagnose RTAS events.^[2]

References

^ PowerPC Microprocessor Common Hardware Reference Platform. s.l.: Elsevier. 2012-06-25. ISBN 978-0-12-801555-1.
^ "Linux on IBM Systems". IBM. 2023-05-10. Retrieved 2025-07-07.

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[m973-1] PowerPC Microprocessor Common Hardware Reference Platform. s.l.: Elsevier. 2012-06-25. ISBN 978-0-12-801555-1.

[n184-2] "Linux on IBM Systems". IBM. 2023-05-10. Retrieved 2025-07-07.

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