LS1046A with Linux OS FPGA Driver

trevor_frederic — Mon, 10 Aug 2020 17:06:49 GMT

I have an LS1046A board running Ubuntu, built using flexbuilder, attached to the LS1046 board is a FPGA device via PCIe. We're writing a driver for the FPGA. The OS sees the device and we can run ioremap() to map physical to kernel memory which returns a high memory address; however, any attempt to use ioread() results in a kernel crash, and no additional information. We've looked through all the Linux device driver books/forums and haven't had any luck in finding out what might be going on.

Re: LS1046A with Linux OS FPGA Driver

Pavel — Wed, 12 Aug 2020 04:10:38 GMT

Check your code using the following pages:

https://www.opensourceforu.com/2011/06/generic-hardware-access-in-linux/

https://lwn.net/Articles/102232/

https://stackoverflow.com/questions/19100536/what-is-the-use-of-iomem-in-linux-while-writing-device-drivers

https://stackoverflow.com/questions/26831583/ioread32-followed-by-iowrite32-not-giving-same-value

https://www.oreilly.com/library/view/linux-device-drivers/0596005903/ch09.html

https://01.org/linuxgraphics/gfx-docs/drm/driver-api/device-io.html

Have a great day,
Pavel Chubakov

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LS1046A with Linux OS FPGA Driver

Re: LS1046A with Linux OS FPGA Driver