Tldr: I need to modify the GPIO table for 4 GPIOs on an obscure Chinese NAS I purchased, changing GPIOTXSTATE bit from 1 > 0.
I’m struggling to work out where exactly the table ends up - or even which element is responsible (other than it not being within the DSDT).
I’ve tried searching for the MMIO base region (FD6E0000) with no joy - but I am just stabbing around in the dark here - where should I be looking? PEI ? DXE ?
Any pointers would really be appreciated.