Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Avalon-to-PCIe Address Translation

Hi, I am trying to transfer data from PCIe endpoint's DDR2 to host's mem via DMA. I can setup DMA and initiate a transfer; I can also see DMA performing DDR2 'reads' on SignalTap-II; but DMA ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hi, thanks for the reply.

I was using virtual address from my process, instead of physical. Upon using the physical addr of the returned virtual addr, the transfers began to work.

We're using real-time extension of Windows called RTX, which has APIs to allocate contiguous mem backed by physical mem from windows' non-paged pool. This apparently preserves the deterministic behavior when mem routines are called. Not using Jungo for device driver dev.

So I'm back on track. This forum has good information and great contributors. Regards.

--------------