Re: [OPAE] Main Memory Access from FPGA

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The CCI-P interface differentiates between MMIO (memory mapped I/O) and mai=
n memory read/write requests. MMIO is an FPGA-side address space, mainly us=
ed for implementing FPGA-side CSRs. Those CSRs are exposed in the software=
=E2=80=99s address space but actually result in PCIe transactions to the FP=
GA.

CCI-P=E2=80=99s main memory read/write requests are exactly what you are as=
king for: DMA to host main memory. The primary address space used for those=
 requests is a =E2=80=9Cphysical=E2=80=9D I/O address space that maps to ho=
st physical addresses. It is also possible to use virtual addresses on the =
FPGA that correspond to the software=E2=80=99s virtual address space. For t=
hat you can use the MPF VTP extension. See section 3 of the tutorial<https:=
//github.com/OPAE/intel-fpga-bbb/tree/master/samples/tutorial/03_ccip>.

-Michael

From: OPAE <opae-bounces(a)lists.01.org> on behalf of David Nicuesa <david.=
nicuesa.aranda(a)gmail.com>
Date: Thursday, February 7, 2019 at 9:53 AM
To: "opae(a)lists.01.org" <opae(a)lists.01.org>
Subject: [OPAE] Main Memory Access from FPGA

Hi all,

I'm getting started with the examples, specifically with the hello_world fr=
om the intel-fpga-bbb<https://github.com/OPAE/intel-fpga-bbb/tree/master/sa=
mples/tutorial/01_hello_world> repository. Everything works just fine but I=
 was wondering if it is possible for me to access the Main Memory (Not IO) =
from the FPGA using the CCI protocol.

I have an rtl to sum two vectors, so my idea was to provide the addresses f=
or those two vectors from the software application, allocated in General Pu=
rpose Memory. This way, ideally, the FPGA should be able to access those ve=
ctors without having a shared buffer (MMIO).

Is it possible to do this, maybe using some MPF extension? In case this is =
not feasible, I should allocate a shared buffer in MMIO space and then comu=
nicate the vectors through that buffer, right?

Thanks!

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