VIA still isn't engaging in anything in terms of open-source graphics following their failed strategy, but at least when it comes to VIA's APC Android PC, they have now opened up a bit more.
Over at the APC Library they are now offering the source-code to the Linux kernel and boot loader used by this ARM-based PC. They also have board information available along with the APC system software firmware image for re-installing.
Trying to gain access to the boot-loader and kernel leads to their GitHub area, which currently seems to be having problems serving the code. From what the GitHub README says, the boot-loader appears to be based upon U-Boot.
For Linux users (and likely Windows users too), I still recommend avoiding VIA hardware at all costs whether it be ARM or x86.