On Wednesday 30 March 2011 21:48:26 Daniel Palmer wrote: > > That is the PCI port address. > > I don't pretend to understand most of this fully. > On the board the PCI address space/PCI controller is apparently at > 0xfe240000 > So I guess that when that byte is read it should read from 0xfe240000 + > 0x1400? > That doesn't happen and a read happens at 0x1400 and an oops results. > I don't know enough to point the finger really. > > There are probably only 2 people using this board still too. So I doubt > it really matters. :) Is this an ARM machine? The platform specific mach/io.h header file in that case defines an __io() macro that is responsible for mapping port numbers to virtual addresses. You have to ioremap() the physical address 0xfe240000 to a virtual address, and then add the base address to the number inside of the __io macro, e.g. /* in mach/io.h: */ extern void __iomem *this_board_pci_iospace; #define __io(x) ((x & 0xffff) + this_board_pci_iospace) /* in pci controller setup code: */ this_board_pci_iospace = ioremap(0xfe240000, 0x10000); Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
