Thread (10 messages) 10 messages, 5 authors, 2014-02-03

RE: PCIe Access - achieve bursts without DMA

From: David Laight <hidden>
Date: 2014-01-30 14:19:45

From Moese, Michael
Hello PPC-developers,
I'm currently trying to benchmark access speeds to our PCIe-connected IP-=
cores
located inside our FPGA. On x86-based systems I was able to achieve burst=
s for
both read and write access. On PPC32, using an e500v2, I had no success a=
t all
so far.
I'm not sure that you can.
I had to write a simple driver for the PCIe CSB bridge dma on a 83xx ppc.
I think that might be the one in the e500v2.

I don't know how fast 'normal' PCIe slaves are, but we were accessing
an Altera fpga and the latency is less than pedestrian.
I think an ISA bus can run faster!
With moderate length transfers, the throughput was more than adequate.

	David
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