dual head r128

[Michel Lanners]

> Ok, If I follow you correctly, that mean that if we have, for example,
> bus 1 set to 0x10000-0x1ffff, ioportremap() would return, for an address
> in this range, the address + bus_io_base - 0x10000. At least on Macs,
> AFAIK, we have only 64k or 128k of IOs available.

No, the regions are larger. Apple's doc talks about '23 bits of IO
space', which is 8M, at least for the first-generation bridges (bandit,
that is).

Anyway, the best way to find out the size of this region (unless you can
read it from the bridge) is to look at the OF device tree, and the
bridge's region properties.

Cheers

Michel

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