How to: install Linux on your Nintendo DS

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Before you load the distro, you will need a few pieces of hardware. The first is the GBA Movie Player (GBAMP), a device that works like the old GameShark devices for video game consoles and lets you load and run software onto the DS. Then, you’ll need a CompactFlash (CF) card, which pops into the GBA Movie Player slot.

Link: TechRadar.com