AIX 6.1, POWER5 and Spectre/Meltdown

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happened across this, I was waiting on tingling tenterhooks for what IBM would do for p5 and p6. Nothing: Potential Impact on Processors in the POWER Family - IBM PSIRT Blog

Consistent with previously announced end of service, IBM will not be releasing patches for POWER4, POWER5, POWER6 systems and recommends migrating to a more current generation of POWER technology.
No firmware updates for you !
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