Re: [PATCH V7 3/5] arm64: mm: add PROT_DEVICE_nGnRnE and PROT_NORMAL_WT

[Will Deacon]

On Fri, Jul 24, 2015 at 05:15:00PM +0100, Catalin Marinas wrote:
> On Tue, Jul 21, 2015 at 10:59:18PM +0100, Jonathan (Zhixiong) Zhang wrote:
> >  	 *
> >  	 *   n = AttrIndx[2:0]
> >  	 *			n	MAIR
> > @@ -303,12 +303,14 @@ ENTRY(__cpu_setup)
> >  	 *   DEVICE_GRE		010	00001100
> >  	 *   NORMAL_NC		011	01000100
> >  	 *   NORMAL		100	11111111
> > +	 *   NORMAL_WT		101	10111011
> 
> I don't think the write allocation hint makes much sense for WT memory
> (though it shouldn't cause issues either). Just use 10101010.

The EFI spec actually specifies the 1011 1011 encoding, so I think we should
follow that.

Will
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