SD Card usage

I have an old Mini 1018 that I would like to run Linux on.  I would like to install the operating system on an SD card.  Two questions: 1. Can I use a UHS SD card in this netbook and if so what is  the size limitation (64GB, 256GB.etc)? 2. Can I setup the BIOS to look for the SD Card during boot?

Thanks for taking time to read and hopefully reply.

TianHua