On 6 Apr 2001, Eric W. Biederman wrote:

> I recall on the ev6 all memory accesses to locations with bit 40 set 
> are always to IO space are never cached and are never write buffered.

 If that is the case then EV6 is seriously flawed.  You normally have
non-cached locations buffered (since you don't always need peripheral
device accesses to be posted immediately) and can force a writeback with a
memory barrier.  I don't have my 21264 handbook handy, so I can't check
EV6 details at the moment, especially why it is different.

-- 
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +

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