tree 0c6ef6836bf450895c669e52a7c9b9b2042dca62
parent 86a6b44d4deb3118f18ba272028dfd7603440e15
author Igor Guryanov <guryanov@synopsys.com> 1419426427 +0300
committer Alexey Brodkin <abrodkin@synopsys.com> 1421350722 +0300

arc: check caches existence before use

Some cache operations ({i|d}cache_{enable|disable|status} or
flush_dcache_all) are built and used even if CONFIG_SYS_{I|D}CACHE_OFF
is set.

This is required for force disable of caches on early boot.
What if something was executed before U-boot and enabled caches
(low-level bootloaders, previously run kernel etc.)?

But if CPU doesn't really have caches any attempt to access
cache-related AUX registers triggers instruction error exception.

So for convenience we'll try to avoid exceptions by checking if CPU
actually has caches (we check separately data and instruction cache
existence) at all.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Igor Guryanov <guryanov@synopsys.com>