On Tue, May 17, 2011 at 12:17:50PM +0200, Alexander Graf wrote: > > On 16.05.2011, at 07:58, Paul Mackerras wrote: > > > I do the check there because I was having problems where, if the HDEC > > goes negative before we do the partition switch, we would occasionally > > not get the HDEC interrupt at all until the next time HDEC went > > negative, ~ 8.4 seconds later. > > Yikes - so HDEC is edge and doesn't even keep the interrupt line up? > That sounds like a serious hardware limitation. What if you only use > HDEC and it triggers while interrupts are off in a critical section? > Is the hardware really that broken?
If HDEC expires when interrupts are off, the HDEC interrupt stays pending until interrupts get re-enabled. I'm not sure exactly what the conditions are that cause an HDEC interrupt to get lost, but they seem to involve at least a partition switch. Paul. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
