On Tue, 11 Jan 2005, Atsushi Nemoto wrote: > Well, maybe the 'volatile' have no sense, but some archs (including > i386, of course :-)) and some drivers use it. Adding the 'volatile' > will remove some compiler warnings. As will removing "volatile" from broken ports. > Yes, virt-to-phys conversion might be needed, but if we only use KSEG1 > for I/O port/memory, it does not matter. ioremap() is free to return a KSEG2 address on a 32-bit system. With 64-bit systems there is no problem. > And I have some custom boards which really needs different swapping > properties (PCI regions need SWAP_IO_SPACE, but ISA region does not, > for example). I agree that those boards were misdesigned but I want > to run Linux on it without modifying existing drivers. Hmm, that's strange -- does the system glue ISA otherwise than behind a PCI-ISA bridge? So far I've only spotted a single PCI/ISA system wiring the buses as "peers", namely the ancient Intel's i82420EX for 486-class processors. Maciej
