On Thu, May 23, 2019 at 6:44 AM Carlo Pisani <carlojpisani@xxxxxxxxx> wrote: > > maybe irrelevant, but I have just noticed this line in the dmesg > (kernel 4.16, running on C3600) > > "runtime IRQ mapping not provided by arch" > > drivers/pci/setup-irq.c: pci_dbg(dev, "runtime IRQ > mapping not provided by arch\n"); > > It's not exactly clear to me, googling I have found this > https://patchwork.kernel.org/patch/9775659 > > what do you think? Red Herring (ie not a problem). AFAIK, parisc never used firmware to route IRQ lines. For starters, the CPUs never had an IRQ input and always used messages (equivalent to MMIO writes) directed at a CPUs EIEM register. IIRC, the PCI Host bus controller to route IRQ lines to slots in a specific pattern which is hard coded in the PCI host controller driver. See dino (?) and elroy PCI host controller drivers. cheers, grant
