Allen Curtis wrote: > So it works but it may not be as fast as a memcpy(). Sounds like more > testing is required to determine the overall benefit of freeing the > processor.
Right. We are using IDMA only for accessing slow devices, so that CPU don't need to wait for the data and can do some usefull work simultaneously. > > > I did also notice that when i am doing memory-to-peripheral (or > > vice-versa) transfers, IDMA corrupts simultaneous Ethernet traffic > > unless IDMA is set to low-priority mode. Same might apply for > > memory-to-memory transfers. > > What 8260 chip revision are you using? I have found lots of problems when > rev A processors but rev C has been much better. I have done most of my testing with revision A chips. I've had many problems with those chips and it took some time with logic analyzer to debug those IDMA transfers before i got them working. Arto -- Arto Vuori email: avuori at ssh.com mobile: +358 40 754 5223 ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
