[PATCH v2] ARM: realview: basic device tree implementation

Arnd Bergmann arnd at arndb.de
Thu May 22 11:26:19 PDT 2014

On Thursday 22 May 2014 14:09:52 Nicolas Pitre wrote:
> On Thu, 22 May 2014, Arnd Bergmann wrote:
> > On Thursday 22 May 2014 15:45:03 Catalin Marinas wrote:
> > > By making the DMA memory Strongly Ordered, we avoid the
> > > L220 write buffer. In addition to the above commit, we also had
> > > 2503a5ecd86c (ARM: 6201/1: RealView: Do not use outer_sync() on
> > > ARM11MPCore boards with L220).
> > 
> > Ah, so this also stands in the way of multiplatform realview 
> Isn't the real value of a multiplatform realview in the ability to use 
> it with Qemu?  Did Qemu go to the extreme of emulating all those cache 
> issues?

The qemu developers have in the past always argued strongly that they
want to run the same kernel that runs on real hardware. Having a kernel
that runs only on the emulated version but not on actual hardware is
clearly against that goal, and  we should use CONFIG_ARCH_VIRT for
that purpose.


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