We use NetBSD here on both pentium boards, and the DEC alpha board PC164.

Why does the 386 port support the floppy drive on the isa bus, and the
alpha doesn't?

PS arch/i386/isa/fd.c exists, and arch/alpha/isa/fd.c does not!
PPS config stuff also exists in arch/i386/conf/{GENERIC,files.i386}
    but no config stuff in arch/alpha/conf/* for floppy!

PPS Floppy does work, is seen  by SRM, and if an alpha bootable floppy
    is in drive when system booting (ie to update flash) its used, and
    works fine.

PPS according to PC164 tech ref manual the floppy drive is on isa bus
    (like com & lp & mouse) just like the i386!