Date: Fri, 28 Jul 2000 07:23:59 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: "'FreeBSD Alpha mailing list'" <freebsd-alpha@FreeBSD.ORG> Subject: RE: fxp0 hangs my AXPpci33 Message-ID: <Pine.BSF.4.10.10007280720480.60544-100000@beppo.feral.com> In-Reply-To: <14721.38433.540697.393972@grasshopper.cs.duke.edu>
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> > So, why does I/O access also break on Qlogic cards on alphas? They work just
> > peachy on i386. And there are many fine cards that work fine with I/O instead
> > of mem access on alpha....
>
> I thought the i/o problem was only for devices behind ppb's that don't
> support I/O space access. The problem is caused by our ppb/bus code
> not realizing the bridge doesn't support i/o space access & offering
> it as an option..
And *I* thought it was more general than that :-)...
>
>
>
> > Look- I've had the
> >
> > if (getenv_int("isp_mem_map", &bitmap)) {
> > if (bitmap & (1 << unit)) {
> > m1 = PCIM_CMD_MEMEN;
> > m2 = PCIM_CMD_PORTEN;
> > }
> > }
> > bitmap = 0;
> > if (getenv_int("isp_io_map", &bitmap)) {
> > if (bitmap & (1 << unit)) {
> > m1 = PCIM_CMD_PORTEN;
> > m2 = PCIM_CMD_MEMEN;
> > }
> > }
> >
> > stuff in isp_pci since newbus came in. Somebody should add the same to if_fxp
> > (or some more general selector solution) and make this an alpha HARDWARE.TXT
> > entry ("On AXPpci33/Multia, fxp needs to be set for mem_only mapping").
>
> That's what I was planning to do..
NetBSD has a "per bus" I/O or Mem enable/disble mechanism. I used to think
that this would be nice, but it's really a per device thing to have- and some
busses it would be all devices disabled for mem or i/o (heh!).
It'd be nice to have a more general mechanism about this. I don't want us to
go further down the linux road (each driver makes it's own choices- in
compiled binary), but I don't want us to be like Solaris (which is completely
unpredictable as to which space you'll get when you map registers). This
really should be discussed on -arch since this is also a problem on i386 too.
-matt
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