Wednesday 08 July 2009 12:50:56 Hans Petter Selasky napisał(a): > By flush you mean write from CPU cache to RAM, right. And nothing else? You > don't mean discard CPU cache by "flush" ???
Yes. By flush I mean write all valid and modified cache lines to RAM. > > However looking into logs which I have sent you yesterdat I see one > > difference which may be significant. My patch changes Invalidate into > > Writeback Invalidate. In original code if driver write something to > > memory and then invalidate cache > > If that is the case I'm very surprised. Could you make another printout for > me. Compile the kernel with KDB, and add a call to "kdb_backtrace()" in > bus_dmamap_sync() before printing out the writeback and/or invalidate, so > that I can see the backtrace. > > > , the write will be lost. > > I'm aware about that. Full log with backtraces is here: http://people.freebsd.org/~raj/logs/usb-cache.log > > With my patch after > > change will be written to memory and then cache will be invalidated. What > > do you think ? > > You are absoultely sure that your USB code is indentical to the now stock > 8- current USB code, and that there are no integration issues lurking? > I am using current from 2009.06.15. In later versions is bug in ARM pmap causing segmentation fault in ehci atatch code (for more details loot at http://www.nabble.com/pmap-problem-in-FreeBSD-current-td24352351.html). -- Pozdrawiam. Piotr Zięcik _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "[email protected]"
