> > > > > Timur Tabi wrote: > > > Wood Scott-B07421 wrote: > > > > To be totally safe, we probably want to do a readback plus twi (to turn > > > > a data dependency into a flow dependency) before the isync. > > > > > > twi == trap word immediate? > > > > Yes. > > > > > If so, I don't see how that will turn a data dependency into a flow > > > dependency. > > > Is that some sort of side effect of twi? > > > > It decides based on the input register (data dependency) whether to cause a > > trap (flow dependency). We never want it to actually trap, so we set a > > condition that says never trap, but the dependency is still there -- the > > hardware doesn't decode it as a no-op. > > > > See arch/powerpc/include/asm/io.h, it's used in the I/O read accessors. > > Guys, unless you will do the twi stuff now I suggest you ACK this > patch so 83xx works again.
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