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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