PCI Express - chaining DMA - newbie Q

Hello,

Thanks a lot to *likewise* for writing and publishing the linux driver. It gave me a very good point to start. And actually it worked great for me.

I am using an Arria GX Development Kit.

Now i have to port the driver to another realtime operating system.

Unfortunately i don't get MSI (Message Signaled Interrupts) to run with that other operating system.

What would i have to change on the driver to use legacy interrupts instead? Is it possible at all, or do i have to change the FPGA image?

I assume i have to write a different value to w0... but what exactly?

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ape->table_virt->desc[n].w0 |= cpu_to_le32(1UL << 16)/*local MSI*/;

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Unfortunately my own knowlede about FPGA is very limited. Where can i get that information? I currently just use the standard image that came installed with the Development Kit.

Thanks a lot!