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Run-Time Abstraction Services
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<p>Run-Time Abstraction Services (RTAS) is run-time <a href="/facts/Firmware/62UVKIUK">firmware</a> that provides abstraction to some <a href="/facts/Operating_system/8XTuvMh2">operating systems</a>. These include those running on <a href="/facts/IBM_AS%2f400/BWYaNnqe">IBM System i</a> and <a href="/facts/IBM_System_p/ycAeJell">IBM System p</a> computers. </p><p>It contrasts with <a href="/facts/Open_Firmware/M9e578XY">Open Firmware</a>, in that the latter is usually used only during boot, while RTAS is used during run-time. </p><p>Later it was renamed to Open Power Abstraction Layer (OPAL), and it's stored in a PNOR (platform NOR) flash memory. </p><p>Ppc64-diag, libservicelog, servicelog, and powerpc-utils packages can be used to diagnose RTAS events. </p>