Re: Adaptec 2010S i2o + x86_64 doesn't work

[Arjan van de Ven <arjan@infradead.org>]

On Fri, 2005-04-15 at 20:10 +0200, Markus Lidel wrote:
> Hello,
> 
> Alan Cox wrote:
> > On Gwe, 2005-04-15 at 17:15, Miquel van Smoorenburg wrote:
> >>However, I removed 2 GB from the box as Alan sugggested and now the box
> >>comes up just fine with a 64-bit 2.6.11.6 kernel! I've put the 4GB back,
> >>and booted with the kernel "mem=2048" command line option - that also
> >>works, the i2o_block driver sees the adaptec controller just fine.
> >>And I just booted it with "mem=3840M" and that works too.
> >>So the problem appears to be 4 GB memory in 64 bit mode, on this box.
> 
> OK, i never tried it with 4 GB so it really could be a problem...
> 
> > Or the driver is incorrectly handling 64/32bit DMA limit masks which
> > would be my first guess here, and would explain why it works on AMD
> > Athlon64 boxes.
> 
> Hmmm, i only set DMA_32BIT_MASK and don't do anything special on 64-bit 
> systems... Is there anything else to do for correct DMA mapping?


are you sure the HW isn't 31 bit by accident ?