Rebuild and flash FPGA to activate custom configspace (recommended), or activate on pre-built bitstream by calling LeechCore library API (less recommended).
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It's also possible to configure FPGA PCIe core to receive most config packets on software interface - mbe it's even possible to emulate a device in software (not implemented tho).
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Nice stuff. Do you know of any tutorials/papers showing where to start if I was about to create some custom IP co-processor running over PCIe and how to write dedicated unix driver?
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no, I'm not aware, I have not looked into it into detail yet, but you'll be able to get most PCIe TLP packets onto other computers USB as-is now.
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is there a way to update the sp605 with the current configuration space edits?
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maybe, I have not looked into it, I don't really support it any more coz of the horribly outdated dev environment. I'm not going to do it tho. But the ScreamerM2 is a quite nice board...
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Čini se da učitavanje traje već neko vrijeme.
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Also, code signing of binaries.