Thanks, I will test mm command and let you know the result.

Regards,

Heyi

On Fri, Apr 13, 2018 at 09:19:53AM +0200, Ard Biesheuvel wrote:
> On 13 April 2018 at 04:05, Guo Heyi <heyi....@linaro.org> wrote:
> > Hi Ard,
> >
> > Any comments?
> >
> 
> Apologies for the delay. I have been travelling and am behind on email.
> 
> > Anyway we can modify the code if you insist on using an intermediate CPU IO
> > address space.
> >
> 
> I have not made up my mind yet, to be honest. I agree there is a
> certain elegance to merging both translations, but I am concerned that
> existing EDK2 code may deal poorly with I/O addresses that require
> more than 32 bits to express.
> 
> Did you try the mm command in the shell for instance? As you know, I
> recently removed an artificial address range limit there, but I wonder
> if it uses 64-bit variables for I/O ports.
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