[U-Boot] [RFC PATCH] armv8: Extend modification of MMU tables

[york sun]

On 02/03/2017 02:24 PM, York Sun wrote:
> Device memory needs to be set along with PXN and UNX bits. Normal memory
> must clear these bits. To support modification of PXN, UXN bits, extend
> existing function mmu_set_region_dcache_behaviour() to accept attributes
> directly. Also fix parsing d-cache option by removing extra shifting.
>
> Signed-off-by: York Sun <york.sun at nxp.com>
> CC: Alexander Graf <agraf at suse.de>
> ---
> Looks like original function mmu_set_region_dcache_behaviour() was written
> to support changing d-cache option. However the PMD_ATTRINDX(option) shifts
> it further higher. Maybe this function wasn't really used for ARMv8.
> I have a need to update existing MMU table with a little bit more than
> d-cache options. With a recent debug on memory barrier, it came to my
> attention that code should run on "normal" memory, while "device" memory
> should have PXN and UXN bits set. A new function mmu_set_region_attr() is
> hence introduced and mmu_set_region_dcache_behaviour() becomes a wrapper.
>
> BTW, if we don't plan to use "read_start" and "real_size" variables, they
> should be removed.
>


Let's skip this patch for now. I have sent another set to address my 
issue with MMU update. We will need another patch to address the 
mistaken index.

York