Re: PowerMac PMU programming

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.