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Altera_Forum's avatar
Altera_Forum
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11 years ago

PCIe MSI Interrupt

HI, I have Cyclone V/GT with Gen2 4 lane DMA example design. The FPGA card is plugged into PC running Windows 7. I wrote a windows driver. It seems that the MSI interrupt is not received. After t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

Do you have to following in you .inf file for the driver? 


HKR,,MSICapability, 0x00010001, 0x00400000
HKR,,MSINeeded, 0x00010001, 0x04
HKR,,EnableMSIInterrupts, 0x00010001, 0x01
HKR,Interrupt Management, 0x00000010
HKR,Interrupt Management\MessageSignaledInterruptProperties, 0x00000010
HKR,Interrupt Management\MessageSignaledInterruptProperties,MSISupported, 0x00010001, 1
HKR,Interrupt Management\MessageSignaledInterruptProperties,MessageNumberLimit, 0x00010001, 8

Without those registry entries, MSI interrupts will not be enabled.