Accessing flash directly from User Space [SOLVED]
paubert at iram.es
Sat Oct 31 04:49:04 EST 2009
On Fri, Oct 30, 2009 at 10:46:46AM -0600, Jonathan Haws wrote:
> > Michael Buesch wrote:
> > > Yes, I think the barrier is wrong.
> > > Please try with
> > >
> > > #define mb() __asm__ __volatile__("eieio\n sync\n" : : :
> > "memory")
> > For uncached memory, eieio should be enough.
> I tried eieio alone and it did not work. It needed the above command to take care of it all.
Surprising. But sync is a superset of eieio, no?
In this case a sync alone should be sufficient (although an eieio
followed by a sync should not be much slower than a sync alone).
More information about the Linuxppc-dev