Re: struct page to 36 (or 64) bit bus address?

[Johannes Erdfelt]

On Fri, Aug 10, 2001, Gerd Knorr <[e-mail]> wrote:
> > > Note, if you use the "bttv method" (ie. virt_to_bus) your driver will
> > > then fail to compile on several platforms.
> >  
> >  So noted. I already have a PCI DMA API version, but I wanted to code up
> >  a "i have an i386 and gigs of memory" version as well.
> 
> Forgot about virt_to_bus() then, it doesn't work for highmem.

I knew that already :)

The thing about 64 bit PCI cards is that there is no such thing as
highmem, so we don't need to worry about mapping it and using bounce
buffers. The device just DMA's. That's why I originally asked.

I took a look at the code in the 2.4.7 version of bttv.c and it wasn't
readily obvious what Alan was referring to. I'll spend some more time
tomorrow looking into it.

JE