In addition to all that, is the GPU documented? Clicking "Request technical specs" on the Imagination website brings me to a page asking me for my business name, business email, business...
Last time I wanted rs-232 specs of a solar inverter, took me months to contact them and after some persuasion, a guy emailed me an NDA I had to physically print, sign, scan and send them back before they gave me a copy.
Obviously I was feeling funny so I signed Johnathan doe and they send me the file.
Turns out, that file was readily available online in forums because others had done the same thing.
I was looking at an import inverter that advertised CAN and rs485 support both on the website and in the manual's specs section with zero further mention. I emailed the vendor and the manufacturer at least 4 times requesting documentation with zero response. Seems to be status quo for cheap import junk. Meanwhile outback power systems offers protocol documentation in the form of manuals freely downloadable. Incredible stupidity.
on the contrary, in my case it was phocos.com which seems to be germany based and sells in many countries so this isn't just your rando junk but they still insist on stupid stuff