Custom ip: can't see IRQ number in system.h

Also,

As the guys above stated make sure your _hw.tcl file is correct. It is located in your root quartus project directory labeled projectname_hw.tcl. I've attached mine to this post so you can check it out. If you are getting the same warning mentioned above you may want to modify the "associatedaddressablepoint" with the name of you IRQ_RECIEVER in your Qsys custom component. I think you have to be careful to to make sure it is the name of the irq block in your interfaces tab and NOT the name of you Avalon Memory Mapped Slave which is probably s0. You can see in my that my irq sender is irq_s0.

Side note: For some reason Qsys doesn't pick up changes made to custom components very well. You may have to add/remove the component a couple times before Qsys picks up the change. This is very aggravating especially if you don't realize your changes are not getting updated when you re-add the component you made changes to.

Hope this info helps.