Re: [LinuxBIOS] Missing IRQ table entries; irq_tables.c problem?

[Jonathan Sturges]

My apologies, forgot to update the subject line!
> > One thing I'd like to investigate as well is initializing the IRQ router in
> > LB.  I've seen some discussion about this in the past, and I've come to the
> > conclusion that for Geode GX1/CS5530 systems, it should be initialized in
> > LB rather than Linux.  It also seems like some LB ports do this, and others
> > do not.
>
> Linux does not know the CS5530 as an IRQ router. So it does not change 
> anything in its registers settings. For this chipset Linux relies on the 
> BIOS. Or you must patch the kernel. How to make LB fill in the routing 
> registers with usefull values?
>
> Juergen

Looking at newer Geode targets, some of the CS5536 systems seem to update the IRQ steering registers; see write_pirq_routing_table() in src/mainboard/artecgroup/dbe61/irq_tables.c.  I think that block of code could be adapted to the CS5530.  Is it pretty much understood that setting the IRQ steering registers within that function is the right place?

-Jonathan

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[LinuxBIOS] Missing IRQ table entries; irq_tables.c problem?

[Marc Jones]

Jonathan Sturges wrote:
> My apologies, forgot to update the subject line!
> > > One thing I'd like to investigate as well is initializing the IRQ router in
> > > LB.  I've seen some discussion about this in the past, and I've come to the
> > > conclusion that for Geode GX1/CS5530 systems, it should be initialized in
> > > LB rather than Linux.  It also seems like some LB ports do this, and others
> > > do not.
> >
> > Linux does not know the CS5530 as an IRQ router. So it does not change 
> > anything in its registers settings. For this chipset Linux relies on the 
> > BIOS. Or you must patch the kernel. How to make LB fill in the routing 
> > registers with usefull values?
> >
> > Juergen
>
> Looking at newer Geode targets, some of the CS5536 systems seem to update the IRQ steering registers; see write_pirq_routing_table() in src/mainboard/artecgroup/dbe61/irq_tables.c.  I think that block of code could be adapted to the CS5530.  Is it pretty much understood that setting the IRQ steering registers within that function is the right place?
>
> -Jonathan

Sounds like the right place to me.
Marc