Hardware/Testpoints

General

The Wii U motherboard exposes several test points, primarily on the bottom of the motherboard (CPU heatsink facing down).

These pins are set to various 8-bit values to indicate the current stage of boot0.

TP9 - Fake Power Button (active low/pullup, pressed=0.0v, not pressed=3.3v), connected to SMC and RTC. Eject button will also pulse this low.
TP65 - TP2003
TP66 - TP2000
TP67 - to front faceplate
TP68 - to front faceplate
TP70 - TP2002
TP127 - ARM/IOP power rail?
TP141 - Connected to RTC. Pulled up by Q1080?
TP144 - Reset? Or functions like one when pulled down by a 3.3Kohm resistor.
TP145 - Connection between RTC and SMC, weirdly sensitive to measurement (power LED reverts to red, but SoC continues running)
TP147 - Connected to RTC and pin4 of U1041 (Comparator in?)
TP148 - Connected to RTC and Q1093 gate. Makes its way to U1041 Pin13 (Comparator ?)
TP149 - Connected to LV5066 pin2 (EN) and RTC. Regulators enable? Pulldown resistor?
TP170 - Eject Button (active low/pullup, pressed=0.0v, not pressed=3.3v)
TP1000 - Direct to SoC, no other connections.
TP1001 - Direct to SoC, no other connections.
TP1002 - Direct to SoC, no other connections.
TP1003 - Direct to SoC, no other connections.
TP1004 - LV5064 pin10, temp sensing? direct to SoC
TP1005 - LV5064 pin11, temp sensing? direct to SoC
TP1006 - LV5064 pin12, temp sensing? direct to SoC
TP1007 - LV5064 pin13, temp sensing? direct to SoC
TP1008 - LV5064 pin14, temp sensing? direct to SoC
TP1010 - LV5064 pin9, temp sensing? direct to SoC
TP2000 - To SMC
TP2001 - To faceplate
TP2002 - Power Button (active low/pullup, pressed=0.0v, not pressed=3.3v)
TP2003 - To some transistor gate?
TP2004 - GND