Re: Problems accessing passthrough PCI device

[Simon Martin <furryfuttock@gmail.com>]

Hello Jan,

>>
>> Yes,  the  first thing I do in the driver is set the PCI configuration
>> access  bits to 7 that should enable IO space, Memory Space and Master
>> BUS access.
>> 
>> As  a  test I disabled this and all reads to the PCI device return -1,
>> even the first one.

> I implied your earlier statement to mean that. But - did you also
> verify that the three flags actually end up set (ideally from both
> DomU and Dom0 perspective)? The PCI backend may be screwing
> up things...

Yes I do verify the write. How do I check this from Dom0?

>> I  agree,  this looks more than a hang than a crash. I've just found a
>> link to the USB debug cable. I've ordered one but it will take a while

> And I hope you first verified that your system meets the criteria
> for this to work in the first place?

I followed the checks in the Kernel earlyprintk debugging HOWTO, i.e.
lspci -vvv to check the USB debug capability, and it verified. The
device is ordered and now just to wait....


-- 
Best regards,
 Simon                            mailto:furryfuttock@gmail.com