Messages in this thread | | | Date | Thu, 4 Sep 2003 07:15:35 -0700 | From | Matt Porter <> | Subject | Re: [PATCH] fix ppc ioremap prototype |
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On Thu, Sep 04, 2003 at 06:01:39AM -0700, David S. Miller wrote: > On Thu, 4 Sep 2003 22:59:33 +1000 (EST) > Paul Mackerras <paulus@samba.org> wrote: > > > Perhaps the sensible thing is to have a separate resource tree for > > each PCI domain (actually two trees, for I/O and memory space), > > and have them contain bus addresses rather than physical addresses. > > I disagree, I think the current model where all resources are > in a global space makes more sense.
The global space method doesn't allow for proper resource management in systems with a small floating physical address window but a huge bus address space to be accessed. MPC8245's DAC scheme is a good example of this as well as numerous Xscale PCI implementations. Paul's suggestion would allow the removal of lots of ugly hacks.
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