Run-Time Abstraction Services
Run-Time Abstraction Services (RTAS) is run-time firmware that provides an abstraction layer for certain operating systems on IBM System i and System p computers. Unlike Open Firmware, which is usually used only at boot, RTAS operates during normal operation. RTAS was later renamed to Open Power Abstraction Layer (OPAL) and is stored in the PNOR (platform NOR) flash memory. Tools for diagnosing RTAS events include ppc64-diag, libservicelog, servicelog, and powerpc-utils.
This page was last edited on 3 February 2026, at 17:37 (CET).