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Any complications of using CONFIG_MIPS_UNCACHED..?

Subject: Any complications of using CONFIG_MIPS_UNCACHED..?
From: "Ashish anand" <>
Date: Wed, 21 May 2003 11:16:49 +0530
Original-recipient: rfc822;

I saw a good bit of discussion about CONFIG_MIPS_UNCACHED but
still i am yet to know...

If I want to use CONFIG_MIPS_UNCACHED (ignoring performance)
what all the side-effects and any restrictions that linux should
take care in software ?

I observed something surprising on my R4k mips system(virtually indexed
caches), after i use this option my driver never got status updation by
device in transmit and receive decriptors in system memory , Irrespective
of I (flushed+invalidate) caches or not...

if i don't use CONFIG_MIPS_UNCACHED then before checking status I need to 
(flush+invalidate) cache and whole thing works great...


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