P2020 QoriIQ Exceptions handler

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P2020 QoriIQ Exceptions handler

Contributor II


I am working on P2020 QoriIQ.

Is there a way to know which of the Interrupt Vector Registers (IVOR0 - IVOR35)  accured?

I`m searching for register that will tell me the IVOR number in my exceptions handler.

Thanks for help :smileyhappy:

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2 Replies

NXP Employee
NXP Employee

There is no such register.  If you need to distinguish between different IVORs you need to set them to different addresses, and have the code remember which entry path was taken.

NXP TechSupport
NXP TechSupport

The Table 9-2 of the P2020 Reference Manual contains the assignments of the internal interrupt.

Linux makes no difference between external and internal interrupts. All interrupts in the system are handled by the same Linux API. If this API didn't work, no driver in the system would be able to operate, not just your customer's module.

The customer is attempting to request an IRQ by the resource number which is generally incorrect. The resource number is an index to irq_desc table.

This index is generally _not_equal to the hardware IRQ line number. See Documentation/IRQ.txt for explanation.

To request an IRQ line in a proper way, the customer should:

  1. 1. Declare the IRQ properly in the DTS. Refer to /Documentation/powerpc/booting-without-of.txt for details. The value of the "interrupt"

property is calculated by the following


  [DTS_interrupt_number] = ([EIVPR/IIVPR_addr] - [Interrupt_Source_Configuration_Registers_Base]) / 0x20

                where [EIVPR/IIVPR_addr] is the address of the interrupt configuration registers

                of the IRQ being declared, [Interrupt_Source_Configuration_Registers_Base]

                is 0x50000 for P2020

Have a great day,

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