Re: reserve legacy io regions on powermac

[Jesse Barnes <jbarnes@engr.sgi.com>]

On Wednesday, July 21, 2004 10:51 am, Benjamin Herrenschmidt wrote:
> On Wed, 2004-07-21 at 05:12, Olaf Hering wrote:
> > Anton pointed this out.
> >
> > ppc32 can boot one single binary on prep, chrp and pmac boards.
> > pmac has no legacy io, probing for PC style legacy hardware leads to a
> > hard crash.
> > Several patches exist to prevent serial, floppy, ps2, parport and other
> > drivers from probing these io ports.
> > I think the simplest fix for 2.6 is a request_region of the problematic
> > areas.
> > PCMCIA is still missing.
> > I found that partport_pc.c pokes at varios ports, without claiming the
> > ports first. Should this be fixed?
> > smsc_check(), winbond_check(), winbond_check2()
>
> Note that this is still all workarounds... Nothing prevents you (and some
> people actually do that) to put a PCI card with legacy serial ports on it
> inside a pmac....

Can you actually support this?  Will it work?

As for the patch, why not just reserve the first 64k of address space 
altogether instead of the individual ports?

Jesse