[Question] Memory attribute reserved by Device Tree?

[Robin Murphy]

On 30/06/16 12:10, Masahiro Yamada wrote:
> Hello.
> 
> Which memory attribute will ARM/ARM64 Linux
> set to the memory region reserved by
> /memreserve/ of Device Tree?
> 
> 
> Normal memory non-cacheable?
> Or, cacheable?
> Or, not defined?
> 
> Perhaps actual behavior depends on whether the reserved area is
> located in the low-memory region?

Isn't the point of memreserve that the kernel avoids mapping it at all?
If a reserved region is later mapped in by a driver using
dma_declare_coherent_memory(), ioremap(), memremap() or whatever else,
then the attributes will vary depending on the exact method used.

Robin.

> 
> 
> Thanks,
> 
>