Re: Okay, I give up. How *do* you use ioremap()?
Andreas Bombe (andreas.bombe@munich.netsurf.de)
Mon, 15 Nov 1999 00:15:24 +0100
On Sun, Nov 14, 1999 at 10:49:10PM +0100, Ingo Molnar wrote:
>
> On Sun, 14 Nov 1999, Ingles, Raymond wrote:
>
> > >> info->mem_base = ioremap(info->reg_base,
> > >> JS_PCI_VORTEX_MEM_SIZE);
> > >> regval = readl(info->mem_base +
> > >> JS_PCI_VORTEX2_LEGACY_CR);
> >
> > >> joy-pci: reg_base 1: de000000
> > >> joy-pci: using reg_base of de000000
> > >> joy-pci: ioremapped, mem_base is c806b000
> > >> Unable to handle kernel paging request at virtual address c8113030
> >
> > >it looks like as if JS_PCI_VORTEX2_LEGACY_CR is overflowing above the
> > >mapped area. Is JS_PCI_VORTEX_MEM_SIZE big enough, and is
> > >JS_PCI_VORTEX2_LEGACY_CR correct?
> >
> > You know, that's actually weird. MEM_SIZE is 0x40000 (262144 bytes),
> > and LEGACY_CR is 0x2a00c. So that shouldn't be a problem. But where on
>
> (Maybe mem_base is not 'char *' and the pointer aritmetics lead to a
> bigger address than intended?)
0x2a00c * 4 = 0xa8030.
That is suspicuously close to the value 0xb8030 Raymond guessed.
info->mem_base is obviously an int*. It should be a char* or void*
(allowing byte pointer arithmetic on void* is a gcc'ism).
--
Andreas E. Bombe <andreas.bombe@munich.netsurf.de>
http://home.pages.de/~andreas.bombe/
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