Messages in this thread | | | Date | Wed, 18 Jul 2007 12:33:45 +0100 (BST) | From | "Maciej W. Rozycki" <> | Subject | Re: uninline check_signature() |
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On Tue, 17 Jul 2007, Geert Uytterhoeven wrote:
> > > No, no revert, please. If the architecture doesn't support readb() then we > > > need some reliable way of working that out within Kconfig. > > > > Isn't that CONFIG_HAS_IOMEM? > > No, having memory mapped I/O doesn't mean you have PCI.
Hmm, TURBOchannel is not PCI, but is still accessible with {read,write}{b,w,l}().
> How to access memory mapped I/O depends on the bus behind the device.
I would have thought this is to be resolved within ioremap() so that drivers can be made portable without twisting your arms. With the more recent ioport_map() call that may be extended to port I/O type devices as well. The Alpha with its dense and sparse I/O space proves it can be done for arbitrarily complicated arrangements.
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