On Sun, 2012-06-10 at 09:29 -0400, Justin Hibbits wrote: > Hello, > > I'm working on various PMU bits for FreeBSD (I know, not related to > Linux), but running into some problems, which the Linux crowd may be > able to help with, as it's already solved for Linux. I've managed to > get it to sleep for performing the sleep operation and for the CPU speed > switch on MPC7455-based machines, but it goes catatonic, not waking > up. I've installed the reset vector pointer at 0x0080, which both OS X > and Linux do, and flush the caches, but no luck. During development of > the Linux driver was this ever encountered? Any assistance would be > greatly appreciated, I've been banging my head against this off and on > for about 8 months now. > > Thanks for any assistance. I'm not subscribed to the list, so please > keep my address in replies.
Yes it was :-) pretty much any bug even minor during that process will cause just that :-) One thing paulus did that helped us a lot initially was write a little synchronous version of the PMU send command and use it to blink the PMU LED very early on when resuming from sleep, which allows us to debug a bit. It takes quite a bit of work (see the code in radeonfb) to get the graphics back, so most of the time you come back with nothing on screen. If your machine is not a laptop, there are other possible considerations, such as the need to restore the PCI-PCI bridge that might be above the macio chip very early on, before you try to restore macio itself (we don't do that in Linux at this stage). Cheers, Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
