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
On 27.05.2011, at 12:33, Paul Mackerras wrote:
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
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
On 27.05.2011, at 22:59, Segher Boessenkool 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.
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.
On some CPUs, if the top bit of the
