Date: Fri, 28 Jul 2000 10:20:15 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: mjacob@feral.com Cc: "'FreeBSD Alpha mailing list'" <freebsd-alpha@FreeBSD.ORG> Subject: RE: fxp0 hangs my AXPpci33 Message-ID: <14721.38433.540697.393972@grasshopper.cs.duke.edu> In-Reply-To: <Pine.BSF.4.10.10007280637430.60544-100000@beppo.feral.com> References: <14721.35393.181226.803212@grasshopper.cs.duke.edu> <Pine.BSF.4.10.10007280637430.60544-100000@beppo.feral.com>
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Matthew Jacob writes:
>
> > I'm reluctant to commit it because I don't really understand why it
> > works. It was just a shot-in-the-dark kind of thing..
> >
> > Does anybody have any ideas why using I/O port access should work,
> > while using the memory mapped access wouldn't? Matt, Doug?
> >
> >
> > The only thing I can think of is that memory mapped access is
> > generally broken on the apecs/lca.. But the NCR driver works, and it
> > uses memory mapped access..
> >
>
> They're not the same kind of device at all.
>
> 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..
> 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..
Drew
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