> Let's switch to the Pocket QWERTY Computer as an example instead of router. The A20 cpu card ships with Parabola, a desktop/workstation style OS. I want my customers to have a good experience when they use my handheld housing. Using an OS tailored for desktop/workstation computing is *not* a good experience on a small screen (I've tried this with the Zipit and it "worked", but was not very productive). I can make this transition even *easier* for average consumer by supplying a SD card with Replicant or some other custom libre distribution designed for small screens.

or, you could supply multiple OS SD cards for them, and set up the
NAND to look an OS on the A20's MicroSD Card slot.

yes, i'm keenly aware that the alteration of the OS to suit LCD size
is a Big Deal.  putting it another way: it's a PAIN IN THE ASS! :)

it's made even more complicated (for the A20) by the fact that the
people who did the sunxi u-boot and mainline kernel didn't think about
this in advance: they've specified that the LCD shall be set up by
u-boot and u-boot alone, leaving absolutely no possibility for
changing the LCD size without a total reboot!  oops...