Hi Clemens, > > Hello, Kumar, Hi, Marta! > > >> Glad I managed to make sense. I checked the hardware spec on the board > >> and it looks like we're using everything, apart from the SEC and maybe > >> the stand-alone I2C (I think we're just using the one within the CMP). > >> By the way, I made a mistake and the actual processor on the board is > >> the cut-down 8541, not the 8555. My apologies for that. > >> > >> This morning I added some printks and confirmed that there is no code > >> behind pm_ops, so my question remains: is there some code out there > >> that > >> I can use? (hope so, otherwise I'm doomed...) > > > > I'm sorry to say you're doomed. I don't believe anyone's spent any > > time trying to do pwr mgmt on 85xx. > > I am working with the MPC8540 in a mobile product and some > power saving would be fine to use. But I haven't seen any > power management code for that thingy in the kernels at all. > So, there is some work left there. Maybe I will have > a closer look in the future. > > According to some tests of a board manufacturer, the cpu > doesn't power down very much, when you stop some peripherals > or send the core to nap. But I wasn't able to confirm that yet.
We're estimating 2.5 watts saving on doze mode, in case that helps. That's for a 8545 @ 800MHz > > Best greets, > > Clemens Koller > _______________________________ Bfn, Marta Chamorro _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
