noncontiguous memory question

I'm playing with NetBSD kernel and going to port on
Psion Revo plus (ARM710 based). 
It has two RAM banks and I have found nothing related
to noncontiguous memory 
support in arch/arm/arm32/pmap.c.
Please let me know
 1. current noncontiguous memory support for arm port.
 2. Is exist some useful doc related to virtual and
physical memory mapping(in addition to UVM source) ? 
Lawrence Kesteloot's stuff is poor and dated. 
Also, arch/* source investigation shows several 
approaches to memory mapping and I would like to know
best practice. 
Please just say that this port is better than each
other and I will try to investigate these patterns.


Thanks,
Arthur

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