We have other engineers who tend to work on designs with embedded processors. I mostly focus on FPGA system level design and high speed data paths and controls. Or if you’ve connected through ioctl calls, then handling that call, parsing what the request is and implementing it. In practice, I’ve seen my systems fail above 4MB. So because of memory fragmentation, there may not be MB of contiguous memory on your system. I saw the diagram you included and yes, basically using either Altera or Xilinx FPGA has nearly the same block diagram. 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.
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Making it easy This post was written by eli on April 25, Posted Under: Here’s the bit about the boot argument. Assuming your kernel supports it, it’s a super easy way to get something working.
Maybe with configurable word widths?
Written By eli on April 25th, And I don’t have access to the book to see if it’s worth a read. Written By eli on February 28th, Linux alterra are generally a bit high level for me.
No kernel programming will be necessary either.
PCI Express Reference Designs and Application Notes
Welcome to Reddit, the front page of the internet. Xillybus gives you the data directly through a device pcue interface. 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. No registration is required. Written By eli on March 22nd, Moreover, are you the one who coded the driver on Linux?
Written By Diego on March 22nd, Do you have terminal access? So basically, I just ran a program that reads or writes to a file descriptor as fast as possible typically a few GBsand divided the amount of data with the time elapsed. Written By Venice Lim on February 9th, However, it’s extremely dated 13 years old and I’m not sure how much of it still applies to a modern kernel.
Xillybus usage example click to enlarge. Maybe better to check with them first though. 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. Submit a new link. I’m more a micro processor alrera of guy, but I’ve dabbled. When I’m done with this, I would love to release an example for people, but that might be difficult due to company rules. Try building this and demo apps, and seeing if it works. 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?
All that is needed, is to compile a certain kernel module against the headers of the running Linux kernel. In general, somebody has already done something similar. Written By pinux on February 9th, Depending on what already exists.
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. This is not a research project, but rather an implementation of an IP core.
I still have no idea how to write a driver from scratch, despite having done it a few times. I should have been more specific. As we aren’t planning on using this outside of our lab, we won’t be distributing it so it doesn’t matter.