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The host uses this port to program the descriptor controller. Do you have terminal access? The first figure shows the requester waiting for the completion before issuing the subsequent requests. Also, thanks for telling me about UIO Drivers. If it helps, I’m pretty sure any mod to the linux kernel tree has to be released as open source. Post as a guest Name. Pretty much everything I’ve done before has been bare-metal or a RTOS when it comes to applications like this.

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Because wltera are two separate groups of descriptors for read and write, there are two ports. This computer downloads the FPGA programming file. Which unfortunately I don’t have any suggestions, other than find an existing driver and copy it with any relevant changes.

Are there any DMA Linux kernel driver example with PCIe for FPGA? – Stack Overflow

Thanks for that link though. The read DMA moves the data from the system memory to the external memory.

The reference design uses the following directory structures: I still linuz no idea how to write a driver from scratch, despite having done it a few times. Does anyone any idea where I can found some source?

FPGA subscribe unsubscribe 9, readers 15 users here now A subreddit for programmable hardwareincluding topics such as: You can also use the software driver to measure and display the performance achieved for the transfers. Email Required, but never shown. The reference design includes the following components: If you got your UIO driver to bind to your device then you should be able to mmap the device to get access to it’s memory.


The read throughput depends on the delay between the time when the Application Layer issues a Memory Read Request and the time the completer takes to return data. It consists of one read and one write data mover, a RX master, a TX slave, and an internal descriptor controller.

A device needs sufficient header and payload credits before sending a TLP. I’m more a micro processor sort of guy, but I’ve dabbled. There are likely some nice examples of pcie drivers in the “driver” directory.

Use of this site constitutes acceptance of our User Agreement and Privacy Policy. Software polls the Done bit in the descriptor table header corresponding to the last descriptor. It’s mostly find something similar, and then mod it until it works. Implement Completion Timeout Disable.

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Software allocates free memory space in the system memory to populate the descriptor table. The source address specifies the location of the data to be moved from by the DMA.

You could always take what you learn and write a nice blog post in your spare time, doing it all again or something. Read Request Size Another factor that affects throughput is the read request size. I should have been more alyera.


For the transmit path, both read and write DMA ports connect to the Txs externally. This computer is referred as computer number 2.

Well yes, the license would apply, but that doesn’t mean that we have to give it back to the Linux kernel. Date Version Changes May, 3. The destination address specifies the location that the data is moved to by the DMA. You will get the following error message when you install the driver for the first time: This value must be less than the maximum payload specified in the Maximum Payload Size field of the Device Capabilities register. I was assuming you wanted to know how to talk to the PCIe peripheral on your processor.

For prototyping, you might be able to get away with just booting up with pice memory. Software Requirements The reference design software installed on computer number 1.