Ability to load extra SSDTs from file, to support HATs about raspberrypipkg HOT 5 CLOSED

Sure, but, what's ACPI Linux on the Pi 3? It's possible, but no one is doing it (that I am aware of). And the value proposition of that is pretty low (esp. because of HAT EEPROM, and because Pi 3 is so non-standard... Pi 4 would be better suited to ACPI).

Assuming you booted in ACPI mode, you'd be better off converting the HAT EEPROM DTB overlay on the fly to a SSDT with _DSD

I'll keep this open for others to see and comment on (though the upstream edk2 mailing list is likely a better place for a call-for-action)

from raspberrypipkg.

I was primarily thinking of Windows here, not Linux. Linux can continue to support HATs using the existing DTB overlay mechanism, but Windows has no chance of ever supporting DTB, so an ACPI analog is needed.

from raspberrypipkg.

For Windows, you can take a look at how Microsoft do that in IoT Core.
This is the sample driver for a SPI LCD display:

https://www.hackster.io/windows-iot/windows-10-iot-core-for-adafruit-spi-touchscreen-bb3795

from raspberrypipkg.

from raspberrypipkg.

This repo is deprecated and I don't check these conversations.

from raspberrypipkg.