Initially, they targeted the Motorola DragonBall family of embedded 68k processors (specifically the 68EZ328 series used in the Motorola PalmPilot) on a 2.0.33 Linux kernel.
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For example, the iPodLinux project uses μClinux for its kernel, and so does Mattel's Juice Box, as well as the well-known Nintendo DS Linux port, DSLinux, the lesser-known PlayStation port Runix, and the PlayStation Portable port.
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The "μClinux-dist" userland utilities contain tiny HTTP servers, a small 'sh like' shell, and even a fun ASCII art Star Wars film.