Calling all Asus P8x7x board owners, and Q about NCT5535D

Hello,

I recently got my hands on boardviews of many Asus P8x7x series
mainboards, and some offshoots such as Z77-A and Sabertooth Z77, and
have also found a way to extract VBT data and the USB port config out
of the vendor firmware image (which isn't really a straight image, but
what looks like an update capsule), allowing me to attempt something
quite ambitious given I only have the P8Z77-M on hand: Bring coreboot
to the entire family.

Again because I only have the vendor firmware image and boardview to
go by, I will only be able to put out an untested new board patch,
hence I am calling for anyone with these boards, that aren't already
in the tree, to help me test them, and to get things I can't get out
of firmware image, such as HDA verbs and GPIO setup, by running
autoport on your board.

Additionally, if you have a P8Z77-V (Hello Bill!), please test this patch:
https://review.coreboot.org/c/coreboot/+/85413
And if you have a P8Z77-M PRO, please test your serial port, and if changing
it to use serial port A like P8Z77-M does, make the serial port work.

Now, during my survey of the board family, I found that:
1. They link their power LEDs to only one of two GPIOs on the PCH: 8
or 27. That's easily determined from the boardview.
2. Except for P8C WS which I can't get a boardview for, this family
only uses one of two Nuvoton super I/Os: NCT5535D or NCT6779D. 6779 is
well known, but I cannot find the datasheet for 5535, and the pinout
for the closest thing I can find, NCT5532D, have the pins shifted by
approximately 3 pins, and there may be more differences.

Does anyone know anything about NCT5535D or can hook me up with a datasheet?

Thanks
Keith
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