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SimonRichter's avatar
SimonRichter
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

Where is the legacy interrupt enable/disable flag?

I'm trying to trigger an interrupt from a CycloneIV GX, using either an MSI if available, or a legacy interrupt. I've found the "MSI master enable" in cfg_msicsr(0) to know whether I should send MSIs...
SengKok_L_Intel's avatar
SengKok_L_Intel
Icon for Regular Contributor rankRegular Contributor
6 years ago

Per the user guide, the cfg_prmcrs does not tell this is for the command register. If the MSI interrupt is enabled, the legacy interrupt must be disabled. I'm uncertain if the driver side can control to enable at least one interrupt (either MSI or Legacy interrupt) at any time, which means if the MSI interrupt is disabled, the legacy interrupt is supposed to enable.

Regards -SK

  • SimonRichter's avatar
    SimonRichter
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    Okay, so I'll assume that legacy interrupts are enabled if MSIs are not, thanks!