NetBSD master CVS tree commits

[source%NetBSD.ORG@localhost]

thorpej
Mon Aug 25 16:02:28 PDT 1997
Update of /cvsroot/src/sys/arch/i386/i386
In directory netbsd1:/var/slash-tmp/cvs-serv6460

Modified Files:
        machdep.c 
Log Message:
In i386_mem_add_mapping(), don't bother calling pmap_changebit() to mark a
device memory mapping cacheable/non-cacheable:
- PG_N doesn't exist on the 386.
- pmap_changebit() only deals with managed pages.
Basically, calling it is unnecessary, and never did anything.  Pointed
out by Chuck Cranor, and further discussed with Frank van der Linden.

Also, add a comment about why we don't mark pages non-cacheable in
_bus_dmamem_map().