[PATCH 1/2] [usb] make xhci platform driver use 64 bit or 32 bit DMA

[Mark Salter]

On Thu, 2014-10-30 at 22:05 +0100, Arnd Bergmann wrote:
> You should definitely make sure that this also works with DT, as
> I don't think it's possible to support X-Gene with ACPI. I know
> that Al Stone has experimented with it in the past, but he never
> came back with any results, so I assume the experiment failed.
> 
> Note that the discussions about merging ACPI support on ARM64
> are based on the assumption that we'd only ever support SBSA-like
> platforms, not something like X-Gene that looks more like an
> embedded SoC. Your XHCI patches still obviously make sense for
> other platforms, so that's not a show-stopper.

But for some misconfiguration, the arm64 kernels in fedora arm
koji would boot using ACPI on Mustang, the Foundation model,
and AMD Seattle platforms. All very much a work in progress,
but the tree from which the fedora patches are taken is the
devel branch of:

  git.fedorahosted.org/git/kernel-arm64.git

The configuration will be fixed this week and then you can
just grab an arm64 fedora kernel and boot with acpi=force.