Port-sun2 archive


Re: /dev/vme*

Quoting Bolo <bolo%cs.wisc.edu@localhost>:


additional devices.

but this may be applicable:

1) it would probably break SunOS executable compatability.   The
        execs can't open the vme address space to access the
        vme resources there properly.

do the accesses with the different widths.

The /dev/vme* devices do more than map different address ranges, they
also map those addresses with the right magic page type in the page table
entries, which is what really routes bus cycles to the VME bus (and in
the sun3 and sparc cases, at the right width).

The mmap magic cookies returned by the sun2 and sun3 mem.c:mmmmap()
include a PMAP_VME* value, which the pmap uses to build the page table
entries.  It looks like the /dev/vme* devices were never implemented
for NetBSD/sparc, although they did exist on SunOS/sparc.

Even though they aren't in MAKEDEV, and probably aren't used anymore,
it would be nice not to lose them..

Matt Fredette

Home | Main Index | Thread Index | Old Index