Re: [Qemu-devel] [PATCH 4/3] wakeup: only reset the CPU

[Paolo Bonzini]

Il 05/03/2013 17:59, David Woodhouse ha scritto:
> On Tue, 2013-03-05 at 17:03 +0100, Paolo Bonzini wrote:
>> > Resuming from suspend-to-RAM should not reset all devices.  Only the
>> > CPU should get a reset signal.
> Hm... on reflection, I don't actually know if this is true.
> 
> Perhaps we *should* reset all devices. After all, in a real machine
> they'll all have been turned off and the RAM will have been in
> self-refresh. Surely they have to be reset?
> 
> So maybe we should *let* the i440FX PAM registers get reset to point to
> ROM. And fix the firmware to *cope* with that, check to see if the
> shadow RAM already holds an image of a started-up firmware with the
> correct checksum, and jump back to it.
> 
> That is: perhaps it's a *SeaBIOS* bug that suspend/resume doesn't work
> if the PAM configuration is reset?

Yeah, it sounded a bit weird when I wrote that commit message.  This
could be the case.  How does it work on Coreboot?

Paolo