[U-Boot] [PATCH v2 1/2] ARM: Move SYS_CACHELINE_SIZE over to Kconfig

[Stephen Warren]

On 08/22/2016 06:22 AM, Tom Rini wrote:
> This series moves the CONFIG_SYS_CACHELINE_SIZE.  First, in nearly all
> cases we are mirroring the values used by the Linux Kernel here.  Also,
> so long as (and in this case, it is true) we implement flushes in hunks
> that are no larger than the smallest implementation (and given that we
> mirror the Linux Kernel, again we are fine) it is OK to align higher.
> The biggest changes here are that we always use 64 bytes for CPU_V7 even
> if for example the underlying core is only 32 bytes (this mirrors
> Linux).  Second, we say ARM64 uses 64 bytes not 128 (as found in the
> Linux Kernel) as we do not need multi-platform support (to this degree)
> and only the Cavium ThunderX 88xx series has a use for such large
> alignment.

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

This has the potential to cause a few more cache warnings due to the 
slightly stricter/larger alignment checking on older ARMv7s with smaller 
cache lines. However, it works fine on all the Tegra systems my 
automated tests run on right now, which does include one Cortex A9 with 
32-byte cache line, and doesn't seem to actually trigger any additional 
unaligned buffer warnings.