Re: Problem with ioremap which returns NULL in 2.6 kernel

[Jeff Garzik]

Markus Lidel wrote:
> Hello,
>
> Jeff Garzik wrote:
>
> > > could someone help me with a ioremap problem. If there are two 
> > > controllers plugged in, the ioremap request for the first controller 
> > > is successfull, but the second returns NULL. Here is the output of 
> > > the driver:
> > > i2o: Checking for PCI I2O controllers...
> > > i2o: I2O controller on bus 0 at 72.
> > > i2o: PCI I2O controller at 0xD0000000 size=134217728
> > > I2O: MTRR workaround for Intel i960 processor
> > > i2o/iop0: Installed at IRQ17
> > > i2o: I2O controller on bus 0 at 96.
> > > i2o: PCI I2O controller at 0xD8000000 size=134217728
> > > i2o: Unable to map controller.
> >
> > If "size=xxxx" indicates the size you are remapping, then that's
>
>
> Yep, it is...
>
> > probably too large an area to be remapping.  Try remapping only the
> > memory area needed, and not the entire area.
>
>
> Is there a way, to increase the size, which could be remapped, or is 
> there a way, to find out what is the maximum size which could be remapped?

My preferred approach would be:  consider that the hardware does not 
need the entire 0x8000000-byte area mapped.  Plain and simple.

This is a "don't do that" situation, and that renders the other 
questions moot :)  You should only be mapping what you need to map.

	Jeff

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/