28 Sep
2004
28 Sep
'04
4:17 p.m.
Florian Schmidt wrote:
On Tue, 28 Sep 2004 09:57:15 -0700
Mark Knecht <mknecht(a)controlnet.com> wrote:
Florian,
It may be possible to change the priorities in the the old PIC
model. I do not know of anyone that actually does it nor do I know what
the real world implications of doing it might be.
It is my understand that in a 'IBM Compatible PC' that the interrupt
priorities are never changed. I suppose it's possible that the
capability exists to do so but that no one really uses it.
I do know that the ability to change the priorities is considered
one advantage of the newer APIC model.
Of course, I could be quite wrong!! Take it all with a grain of salt!
Cheers,
Mark
One last little sickening detail I forgot to add
before. Sorry for
doing it now.
In the older 'compatibility model' we knew the 'prioity of the
interrupt from the interrupt number:
0,1,8,9,10,11,12,13,14,15,3,4,5,6,7. It was hardwired.
Hi,
i welcome your chiming in because now you got me confused :)
http://roht.informatik.uni-halle.de/~ladischc/pic_priorities.html
That page says one can change the irq prios directly in the PIC. So, are
they hardwired now, or not?
Flo