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always safe to call invalidate_icache_all().

So it's back to use the compiler define for ARMv7.

> The only problem I see for now is that, while ARM has a default
> icache_status(), apparently the targets that need the invalidate above
> do not have their own version of icache_status(); they'll need to
> provide one for this code to work.

And also an invalidate_icache_all(). That only exists on armv7 today.

m68k have icache_invalid() which seems to be the same.

Regards
Henrik