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RE: [Xen-devel] vm86 - DCC probes don't work

On Tue, 22 Feb 2005, Ian Pratt wrote:

> > ddcprobe is trying to read hardware I2C buses. On a radeon card these
> > are part of the mmio address space. Not sure where they appear on the
> > i915 but it should be easy to find in the source.
> I suspect the i915 driver is going at the address using __va rather than
> using isa_bus_to_virt. Please can someone investigate and send a .patch
> (and feed upstream too).

Dccprobe is trying to do BIOS calls from vm86 mode.

I wonder if we're just not mapping certain physical addresses
into vm86 mode (in domain 0) that the program expects there to
be ...

"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan

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