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

[Julien Grall <julien.grall@xxxxxxxxxx>]

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.
--
Julien Grall

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