Hi,

I am facing an issue routing the interrupts from the Ethernet devices which are on GPP PCIe 1, GPP PCIe 2, and GPP PCIe 3 on a custom hardware that is running AMD G-series - Steppe eagle (Mullins, Family 16h Model 30h-3Fh) . 

I am attempting to use the PCI IRQ from the Ethernet devices, but this is not working.  I am trying to route the PCI IRQ to legacy PIC using C00/C01 Interrupt Router.  I have verified the interrupt was generated by the Ethernet end device but we don’t see it getting received by the PIC.

 

I am using FCH in PIC mode, and have local APIC and IOAPIC disabled.  In this mode I am able to receive interrupts through PIC from Serial IRQ  and  from 8254 timer on IRQ0. There are some limitations with the OS so i cannot use IOAPIC, only legacy PIC can be used.

I do not have much experience with AMD platforms so i am sure what wrong i am doing. Any input will be very helpful. 

Thanks

Abhishek.