You can download debian boot-floppies for pe2550 (and pe2500) at
http://www.hem.net/doc/linux/pe2550_boot-floppies/
If you don't know how to create the floppies from the binary images,
there are good instructions on debians installtion page
http://www.debian.org/releases/stable/i386/ch-install-methods.en.html#s-create-floppy
The aaraid patch is now included in the latest version of the Debian kernel-source packages.
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