__ioremap_at() in 2.4.0-test9-pre2

[Michel Lanners]

Hi Paul,

On  19 Sep, this message from Paul Mackerras echoed through cyberspace:
> What I am intending to do is to map the I/O space of all the PCI host
> bridges in consecutive areas beginning at some address such as
> 0xff000000, with some amount of space such as 64kB or 1MB per bridge,
> whatever is appropriate.  Then we adjust the I/O port numbers in the
> pci_dev structures by adding on host_bridge_nr * space_per_bridge.  As
> a side effect, isa_io_base (which is really pci_io_base) becomes a
> constant.

Good idea. Keep in mind however, that not all bridges reserve the same
amount of space for IO. So you either need to cope with that, or chose
smaller, fixed-size regions, and be prepared to squeeze all devices into
that space. Which shouldn't be a problem, since I can't see why someone
would want to access something larger than a few bytes via IO...

Michel

-------------------------------------------------------------------------
Michel Lanners                 |  " Read Philosophy.  Study Art.
23, Rue Paul Henkes            |    Ask Questions.  Make Mistakes.
L-1710 Luxembourg              |
email   mlan at cpu.lu            |
http://www.cpu.lu/~mlan        |                     Learn Always. "


** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/