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
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