Re: [Xen-devel] [PATCH] enable/disable dom0_11_mapping from command-line and default to enabled

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Sun, 5 Jan 2014, Julien Grall wrote:
> On 01/05/2014 07:24 PM, Stefano Stabellini wrote:
> > On Sun, 5 Jan 2014, Karim Raslan wrote:
> > > Signed-off-by: Karim Raslan <karim.allah.ahmed@xxxxxxxxx>
> > 
> > Thanks!
> > Given that dom0_11_mapping is an int, the patch is OK.
> > However it might be better to turn dom0_11_mapping into a bool_t and use
> > boolean_param instead.
> 
> After reading the thread "Master not working on AllWinner A20", I still don't
> see why this patch is useful.
> 
> Unless if the platform has an IOMMU, the 1:1 mapping for the memory SHOULD be
> enabled. Otherwise DMA-capable won't work.
> 
> See my answer on your mail (thread "Master not working on AllWinner for A20")
> for a proper fix.

It is only useful for debugging and development. It should not be used
in production.

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