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,