RE: PCIe Access - achieve bursts without DMA
From: David Laight <hidden>
Date: 2014-01-30 14:19:45
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