> Fair enough, there's a bunch of fully open source computers that let you really build things from the ground up

Concerning your linked example: if I look at the specs at

> https://www.olimex.com/Products/OLinuXino/A10/A10-OLinuXino-...

I see Mali 400 GPU. Is this GPU now fully open source?

> I see Mali 400 GPU. Is this GPU now fully open source?

If you are talking about drivers (rather than the GPU itself), there are reverse engineered drivers:

https://github.com/yuq/mesa-lima/ https://github.com/yuq/linux-lima https://gitlab.freedesktop.org/lima

For the newer Mali GPUs there is the Panfrost driver:

https://notabug.org/cafe/chai https://gitlab.freedesktop.org/panfrost https://rosenzweig.io/blog/

You can run stuff on any of the Allwinner SoCs without using the GPU, the display controller that provides HDMI or VGA output is separate and fully documented. Some of them also have a simple 2D graphics accelerator.

To be fair, an A10 has a 32kb closed source ROM that's the first stage bootloader, that chain loads your code.