This looks interesting https: Maybe with configurable word widths? Plus after a bit of thought, I think I was on the wrong track. I’ve found some examples from places and finally understand how to initialize the base address registers and got talking to the example design that Altera shipped with the device. It arrives as packets which you need to handle one by one with a state machine you develop. Maybe better to check with them first though.
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Step two, what does the dev board’s creator provide? The above is a very very basic overview of a general kernel driver, but it might give you somewhere to start trying to understand things.
Linux source code: drivers/pci/host/pcie-altera.c (v) – Bootlin
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 out anything that is in your range when you allocate it.
The driver needs to be able to set aside a portion of memory for DMA accesses by the FPGA, and to perform single word bit read and write operations. Written By harini on February 28th, Copy that and make any necessary mods. This should have a PCIe driver included.
Despite this card having a PCIe edge connector, Altera never created an example driver because they only used the a generic Windows drivers which they configure in their test tool which only runs under Windows, because of course it does. And I don’t have access to the book to see if it’s worth a read. I saw the diagram you included and yes, basically using either Altera or Xilinx FPGA has nearly the same block diagram.
PCI express from a Xilinx/Altera FPGA to a Linux machine: Making it easy
As for the Linux side, there is no work at all. Such as if you’ve connected the driver to user space through sysfs then handling people altdra, reading and writing the relevant files. Written By eli on February 28th, Then you just fill in the blanks. Log in or sign up in seconds. Verilog source code is not published, as the IP core is licensed against fees.
Start with the driver registration code. Maybe with configurable word widths? I’m more a micro processor sort of guy, but I’ve dabbled.
I’ve found some examples from places and finally understand how to initialize the base address registers and got talking to the altrra design that Altera shipped with the device. Or an embedded processor running a decent operating system, for that matter. No kernel programming will be necessary either. Plus after a bit of thought, I think I was on the wrong track.
Also it’s hard to say latera what the right way is without knowing a lot of your requirements. I typically only use very tiny processors to handle tasks that aren’t time critical and would otherwise consume a lot of LUTs implemented in HDL when I need to do so.
For prototyping, you might be able to get away with just booting up with less memory. We have other engineers who tend to work on designs with embedded processors.
I’m honestly pretty new to Linux drivers. I pciw like to use a fpga board in order to send information that has been calculated to another computer with a pcie bus.
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? Written By eli on February 8th, I should have been more specific.
Porting to Altera is currently not planned. You linhx I believe bypass this if you write it as a kernel module.
From LDD chapter 15 but high-order requests are prone to fail even when the requested buffer is far less than KB, because system memory becomes fragmented over time. Written By Diego on March 22nd,