ARM with /proc/ioports?

there is an ARM board on my hand with a 2.4.x linux runing on it.
before i got the board, i heard, ARM architecture never use IO ports as
what x86 do, but in the /proc directory i still found a ioports file,
which contains,

d0000300-d000031f : eth0
d31002f8-d31002ff : serial
d31003f8-d31003ff : serial

what this mean? if ARM never use ioports, why the ioports file exists
in the OS?

another confusion is, this board was equipped with PC/104 bus, and i
know PC/104 is actually ISA up to the term of architecture, but ISA
itself is architecture denpendent and tied with x86. my question is
that why PC/104 can be used on an ARM board? to accessing PC/104
resources, i believe the system need to issue seperated IO instructions
which is abvious impossible for ARM. am i right?

thanks.
-
woody

.

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