Copy/paste from opera.com:
The Evaluation Kit supports the following platforms
One of the CPUs: x86, PPC 405, Arm, MIPS
Linux kernel version 2.4.x and newer
Tool chain: gcc 3.2.x and glibc 2.2.x (architecture dependant)
At least 4 MB of Flash and 16 MB RAM available to Opera on the target hardware

Montavista Linux builds are available on request.

If someone could get the evaluation kit, and share the experience... This "commercial" evaluation package is designed to be used by experienced Linux developers. The evaluation license is valid for 1 development seat within a period of 4 calender weeks.
http://www.opera.com/products/devices/evalkit/