Am Mittwoch, 14. Mai 2003 13:14 schrieben Sie:
> > ioremap always returns a null pointer. It seems that it needs to
> > be used for memory mapped IO only... The documentation with the
> > kernel seems to imply that it needs to be always used (for
> > portability).
>
> ioremap is used for mmio along with readb/writeb etc
> outb/outw/.. don't need ioremap
>
> > IO using [in|out][b|w|l] seems to work, ie doesn't crash but does
> > not return correct results either.
>
> The right order is something like
>
> pci_enable_device(foo);
> unsigned long ioaddr = pci_resource_start(foo, n);
>
> outl(0, ioaddr+N)
Maybe I missed the point, but
1. Rubini mentioned it in his book.
2. the saa7134 driver and IIRC bttv does it that way
/* get mmio */
if (!request_mem_region(pci_resource_start(pci_dev,0),
pci_resource_len(pci_dev,0),
dev->name)) {
err = -EBUSY;
printk(KERN_ERR "%s: can't get MMIO memory @ 0x%lx\n",
dev->name,pci_resource_start(pci_dev,0));
goto fail1;
}
dev->lmmio = ioremap(pci_resource_start(pci_dev,0), 0x1000);
Franz
