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The Olimex OlinuXino A20 LIME2 is an amazing, powerfull and cheap open source ARM development board. It costs EUR 45, and has 160 GPIO pins. This is a guide to build a linux image with Debian and the mainline 4.0.0 kernel for the Olimex A20-Lime2 board, from scratch. By default it comes with an 3.4 kernel with binary blobs and patches from Allwinner. Recently the mainline kernel has gained support for these boards, you can now run and use the mainline kernel without these awfull non-free binary ...