Re: __flush_cache_all() miscellany

[Jun Sun <jsun@mvista.com>]

Justin Carlson wrote:

 
> I'm still looking for a reason for the existence of __flush_cache_all().
> 


It is needed by kgdb where gdb client may modify several instructions before a 
'c' command is issued.  In that case, you cannot use flush_icache_range 
because you don't know the range.  It is probably not safe either as the data 
cache may not be written back yet

Does flush_icache_range() mandates write-back of dcache in the same range?  If 
it does, you might be able to get away with flush_icache_range(ICACHE_BEGIN, 
ICACHE_END).

Like someone else has pointed out, __flush_cache_all() is introduced to ensure 
i-cache/d-cache consistency.  I remember it was shortly introduced after we 
had the first cache-coherent system where flush_cache_all() is a null function.

Jun