On 06/14/2018 08:56 PM, Dmitry Osipenko wrote: > For early console you don't need a full-blown driver. In your case the early > console could be activated by appending kernels cmdline with > "earlycon=uart8250,mmio32,0x70006000". Kernel will switch to a proper serial > driver once it is available, so you should be able to have earlycon + hsuart. Oh good, thats a start. But sadly that does not completely work for me. Early console works. If I set the getty to the device, that works, too (without boot-up log from systemd of course). If I also set the tty in systemd, the system just hangs when systemd should take over. Weird. I will take a look into this once I am done with the spurious-interrupts thingy. > The LIC acknowledgement here should have no effect because it clears the "forced > interrupt" bit which is only relevant if kernel performs an IRQ re-trigger. Oh yes you are right! I misread that. > You could try to reset UARTA HW here, will be interesting to see whether that > stops the IRQ. That happens when the getty on the (now polling) console gets closed, e.g. by logout. When a new getty is spawned, the device is reopened and fully initialized again. Interrupts properly work again at that point. I *might* have a fix/workaround for the issue. Please see in my next answer to Mikkos mail. David -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
