Update:

>> A bit of secrecy for this OpenPower hardware.. ;-)

> Yes, unfortunately, the PowerPi SIG operates in complete confidentiality.

Statement on PowerPi by the Technical Director of RED Semiconductor:

"Toshaan Bharvani started the PowerPI initiative, but it was soon taken over by naive people believing that you can get a 5 watt system to do 4-core 3 ghz 7 nm with 128-bit-wide DDR3/4/5 memory and multiple lanes of PCIe and multiple lanes of OpenCAPI in under a budget of USD 10 million, when 7nm Mask Charges are $10 million on their own."
https://lists.debian.org/debian-powerpc/2023/03/msg00014.html

I'm not really sure what to make of this.

> of course, also this significant event doesn't come without
> some dubious statements from the project lead:
> "Libre-SOC […] is the first wholly-independent Power ISA ASIC
> outside of IBM to go Silicon in 12 years." […]
> He tried again and failed once more:
> "our […] test ASIC […] is […] the world's first Power ISA 3.0 [ASIC]
> outside of IBM to reach Silicon in over 12 years."

Seems that whenever he has not the slightest clue when it was that something happened or became available, he claims it was (over) 12 years ago:

"what has been developed […] is the biggest upgrade to the Power ISA since Motorola's VLE Book of over 12 years ago"
https://lists.debian.org/debian-powerpc/2023/04/msg00008.html

Book VLE was officially added to the Power ISA with v2.03 in 2006, so 17 years ago (and then completely deleted from it with ISA v3.0 in 2015). The VLE instruction set itself (as well as processors implementing it) was even available from several years earlier than that, as extension to Book E.

An RFC with the full list of the LibreSoC scalar instruction set (klick), waiting for comments before external review of the OpenPower ISA working group.

> LibreSoC scalar instruction set (klick)

"Power ISA Scalar (SFFS) has not been significantly advanced in 12 years"

Power ISA v2.06 was released 14 years ago, v2.07 10 years ago. Everything happened 12 years ago apparently, always ;-)
(Besides, the current compliancy subsets including SFFS were first published as such with Power ISA v3.0C as recently as 3 years ago.)