nios2: research: scope support for External Interrupt Controller (EIC)

[nashif]

Reported by Andrew Boie:

Initial Zephyr bring-up on Nios II only targets non-vectored Internal Interrupt Controller. As a designer of a system using Nios II and Zephyr, I may need Zephyr support for the External Interrupt Controller so that I can leverage shadow register sets or have more than 32 interrupts configured.

Scope what is needed to implement this and create user stories as appropriate. Support for shadow register sets is in scope for this research topic.

(Imported from Jira ZEP-258)

[nashif]

by Robert Beatty:

Ramakrishna Pallala : {quote}Hi All,

One point about vectored interrupt controller, as per ug_embedded_ip.pdf page 334, VIC core support is only there for following devices.

Which means MAX 10 dev kit does not support EIC/VIC and DE10 Nano board has “Cyclone V” which is not there in the above list. We need get confirmation about the same. Link to DE10 Nano eval kit : http://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=165&No=1046&PartNo=2

This will impact ZEP-258

Thanks, Ram {quote}