Xillybus gives you the data directly through a device file interface. If not, then you’ll have to do lots of googling on linux kernel driver calls. Just find any PCIe driver that does roughly what you want, and google for any function calls, starting with the init function, and then the probe function. Inferred RAM and mux. In general, somebody has already done something similar.

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PCI express from a Xilinx/Altera FPGA to a Linux machine: Making it easy

No registration is required. Making it easy This post was written by eli on April 25, Posted Under: There is no exact meaning to packet size and transfer size when working with Xillybus, because the system presents a stream interface.

I wonder if you can glean some code from it. I was assuming you wanted to know how to talk to the PCIe peripheral on your processor. There’s a bunch of random details that I’m hazy on like whether it’s low memory or high memory, and I think there’s this contiguous memory allocator CMA framework now that allows you to kick linkx anything that is in your range when you allocate it.

Thanks for that link though. I’ve been reading about them and they might be the easiest way lihux me to get this up and running. But I think that’s just a general problem with driver development. I’m inundated with information and not many good explanations at a linx level overview level, sadly. And I don’t have access to the book to see if it’s worth a read. For prototyping, you might be able to get away with just booting up with less memory.


Linux source code: drivers/pci/host/pcie-altera.c (v) – Bootlin

Porting to Altera is currently not planned. When the kernel finds that bit of hardware it then calls your probe function, which configures things as you want memory access, dmas, interrupts, liinux space interface through sysfs or ioctl callstimers, All this holds for a 1x connection as offered by Spartan-6T.

Assuming your kernel supports it, it’s a super easy way to get something working. Written By Smith on February 29th, The usage idea is simple: Written By eli on March 22nd, Thanks Eli for the response on Xillybus throughput. Written By eli on February 28th, The transport is a PCI Express connection.

Written By harini on February 29th, Home My CV Blog’s home. FPGA subscribe unsubscribe 9, readers 31 users here now A subreddit for programmable hardwareincluding topics such as: If it helps, I’m pretty sure any mod to the linux kernel tree aotera to be released as open source. The device in question is a software controlled switch-like product that uses a processor for certain tasks.


Pcei for the throughput: I’m more a micro processor sort of guy, but I’ve dabbled. No kernel programming will be necessary either. Maybe with configurable word widths?

PCI Express Reference Designs and Application Notes

I saw the diagram you included and yes, basically using either Altera or Xilinx FPGA has nearly the same block diagram. Pretty much everything I’ve done before has been bare-metal or a RTOS when it comes to applications like this. Is there an easy way to define a virtual address space for the device to access such that on the Linux side I don’t have to care where in memory it is stored?

When I’m done with this, I would love to release an example for people, but that might be difficult due to company rules.

So because of memory fragmentation, there may not be MB of contiguous memory on your system.