Re: Porting the Digi driver

Ronnie Sanford (
Fri, 7 Feb 1997 08:04:14 -0600 (CST)

Thanks Alan !!

Also thanks to everyone who responded to my message. I have the driver
mostly working now.

Have a good day,

On Thu, 6 Feb 1997, Alan Cox wrote:

> > (In this case 2.1.24). The driver works find under 2.0.28 but running under
> > the new kernel it fails. In particular it fails the first time it actually
> > attempts to access the board.
> Ok first guess is you are assuming physical==virtual
> > ch->txptr = memaddr + (((bc->tseg) << 4) & 0x1fffff);
> ch->txptr = virt_to_bus(....)
> if you want the pointer to contain the bus address to your memory. Or
> phys_to_virt() to get the virtual (ie kernel mode) address of the
> physical space.
> > So the address below 000d1008 looks correct to me. We are trying to address
> > the physical location on our board address 0x0d1008.
> You need to do a phys_to_virt() on it.
> Nothing has changed on the programming API. The kernel now isnt physically
> mapped which broke a few drivers. However in theory people should always
> have used those macros. On the alpha for example they are all needed
> as the physical and virtual maps are different. Worse still the I/O
> devices see main memory in a different place again!
> Alan