19 Nov
2004
19 Nov
'04
10:26 a.m.
On Fri, 19 Nov 04 19:32:13 GMT
msokolov(a)ivan.harhan.org (Michael Sokolov) wrote:
Does anyone know what are the real technical
differences between sun4,
sun4c and sun4m subarchitectures of SPARC from the viewpoint of an OS
kernel writer?
I am not entirely sure, but I think the differences are in in the
CPU
cache, the MMU, the IO architecture (sun4 VME, sun4c SBus) and sun4m is
based on SPRAC V8 CPUs where the older sun4 / sun4c is based on V7 CPUs.
This is a bit simplified. E.g. the SM100 MBus CPU module is for sun4m
machines but has two V7 CPUs. Also: The sun4/6xx CPU boards are sun4m
with VME _and_ SBus. In addition they are the first and only sun4m CPU
boards with VME.
Not to talk about sun4d or Solburn (?) machines...
I know you don't like it, but maybe the NetBSD kernel source is a help.
Google for a file named "sun.hardware.FAQ"...
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/