Hello,
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...
Regards,
Ashish
|