On Thu, 22 Jun 2000, Richard Henderson wrote:
> On Thu, Jun 22, 2000 at 08:45:47AM +0200, Geert Uytterhoeven wrote:
> > But with ioremap() you cannot specify where it has to be mapped, right? So
> > you're still stuck with an offset.
>
> Huh? Who cares where it's mapped. "Some unused space."
> A pointer is a pointer.
>
> In my case there is a direct correlation between the "base address"
> and the "ioremaped address" -- the addition of a constant. That's
> the win for using 64-bit pointers. ;-)
I think we're talking about something different. I don't care about the pointer
nor the ioremap() neither (we explicitly map it in MMU_init()).
The problem is that drivers assume ISA memory space is at 0 and use e.g.
request_mem_region(0xa0000, 65536)
to request the legacy VGA region, while it should be
request_mem_region(isa_mem_base+0xa0000, 65536)
for compatibility with anything besides ia32.
> > > the ISA bus is contained within exactly one PCI hose.
> >
> > Which is not the case on some boxes :-(
>
> The only machines I knew about that had this were the DEC NUMA
> machines. What does your bus configuration look like?
There are multiple legacy ISA regions on some PowerMacs, which have multiple
PCI buses and such.
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.orgIn personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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This archive was generated by hypermail 2b29 : Fri Jun 23 2000 - 21:00:23 EST