You only need the pinout of TPS53659/TPS53679?
If so, it is available in Open Compute Intel motherboard schematics:
View attachment 22010
View attachment 22009
I took it from
Project Olympus Intel XSP Motherboard -- Electrical Collateral zip file (page 163 and 171).
Is this enough?
I've got this exact motherboard and it has both TPS53659 and TPS53679, so they both need to be updated?
According to BOM, there are 7x TPS53659 and 2x TPS53679.
Also, this board has no support and no BIOS updates
at all, so would it be possible to read BIOS, manually patch it and flash it back to support P-8124 SR2YS? Although it's from Microsoft, so if they had custom OEMs, maybe Amazon OEMs will work too? Or it doesn't work like that? According to some people, it does seem to support 1st gen ES chips... The docs say: