Re: Going beyond 256 PCI buses

[David S. Miller]

Benjamin Herrenschmidt writes:
 > I beleive there will always be need for some platform specific
 > hacking at probe-time to handle those, but we can at least make
 > the inx/outx functions/macros compatible with such a scheme,
 > possibly by requesting an ioremap equivalent to be done so that
 > we stop passing them real PIO addresses, but a cookie obtained
 > in various platform specific ways.

The cookie can be encoded into the address itself.

This is why readl() etc. take one arg, the address, not a billion
other arguments like some systems do.

Later,
David S. Miller
[e-mail]