Altera JTAG UART used by kernel does not match IRQ assignment made in Qsys

Hi Bhaumik,

Thank you for the useful reference information. It's good to know that someone else can recreate the basic problem I have been seeing when setting the interrupt values in the .dts file to one value only to sometimes have the kernel remap to a different interrupt at boot up.

My current setup has the timer using IRQ 0, JTAG UART using IRQ 1 and USB Host Controller using IRQ 2. I also have been using my modified altera_jtaguart_probe() function to force the IRQ to different values but so far the right combination has not been found.

If you find out how the information that is entered into the .dts file ends up being associated (or not associated) with the kernel function(s) that end up doing the actual physical and virtual interrupt mapping, I would like to hear about it. I'll do the same if I find out anything on my end.

I currently don't have a better way of debugging other than document the settings used and results from those settings in an attempt to eliminate some of the combinations being used to help narrow it down.

Thanks again for your feedback.

- Brad