Since my broke the screen on both his tablet and my tablet I have kinda lost intrest in the thing, moreover a lot of devices that were previously supported have gone bust on the linux-sunxi kernel.
In any case I did a bit of reserch and it looks like currently the BBB is not built from Allwinner SOC.
It looks like its a
TI AM3358 SOC. I'm not sure if it has allays been like that or if at some point it used to be built from Allwinner SOC.
According to the above URL I don't thing my image builder stands any chance on the BBB ... I'm sorry for making confusion.
You could still use kernel from
TI ... not sure about the boot loader (you'll haveto do your own search) and then the Slackware ARM userland should just be fine.