[U-Boot] [Resend RFC PATCH 1/2] armv8: Fix dcache disable function

[Stephen Warren]

On 10/14/2016 02:17 PM, York Sun wrote:
> Current code turns off d-cache first, then flush all levels of cache.
> This results data loss. As soon as d-cache is off, the dirty cache
> is discarded according to the test on LS2080A. This issue was not
> seen as long as external L3 cache was flushed to push the data to
> main memory. However, external L3 cache is not guaranteed to have
> the data. To fix this, flush the d-cache by way/set first to make
> sure cache is clean before turning it off.

This patch,
Tested-by: Stephen Warren <swarren at nvidia.com>