Re: XEN and cardbus

[Juraj Hercek <nbsd%hck.sk@localhost>]

On 01/22/2010 03:50 PM, Greg Troxel wrote:
> ...
>
> Given that it works with GENERIC and not wtih XEN3_DOM0, I would look
> into what happens with pci memory space mapping.  Read the manpage for
> cardbus(4).  Basically mappings are set up to put the cardbus (pci)
> memory space into the host computer's memory space someplace, and the
> code before what you patched is trying to avoid where physical memory is
> mapped.  But on xen, the whole memory layout may be different.
>    

Ok, I'll read cardbus(4) man page, thanks for pointer.

> Why are you using PAE if you only have 1.5G of actual RAM?
> I suggest trying a non-PAE XEN3_DOM0.
>    

As Christoph already mentioned, Xen 3.3 dropped non-PAE support.  And I 
wanted to use Xen 3.3 because of power management (on the other hand, 
cpufreq=xen didn't work for me, but cpufreq=dom0-kernel works, although 
I read it might have bad impact on DomUs, which I didn't observe, yet)

> If the dom0 sees 512 MB, it probably will try to map the cardbus memory
> to 1G.  But, I don't know how that mapping is effected, or interacts
> with xen memory mamagement.
>    

I'll modify amount of memory for Dom0 and see what and where changes.  
Maybe it will give me more clues.

-- Juraj