[liamness]

Here's some mad lad adding PCIe slots to a Raspberry Pi 4:

https://twitter.com/domipheus/status/1167566293861588992

It's definitely possible, just need to expost the PCIe lanes in a sensible way (this has been rare to see on ARM-based machines so far) and have PCIe device manufacturers distribute drivers for ARM macOS.

[robocat]

And here’s the link without the twitter wrapping: http://labs.domipheus.com/blog/raspberry-pi-4-pci-express-it...

[Macha]

PCIe is surprisingly robust for a high performance interface. fail0verflow mentioned doing PCIe over serial so they could mitm some of the communication when hacking the ps4.