7i77 lost connection while encoder counts (PREEMPT-RT)

lonnox
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08 Jul 2025 14:46 #331526 by lonnox

Replied by lonnox on topic 7i77 lost connection while encoder counts (PREEMPT-RT)

The BIOS give me the option to limit all PCI E to gen1 speed. There is no option/feature like XMP/EXPO option, but one to set the ram speed manually, so i set it to a lower one.
I also tried to use different pci slot for the 6i25 (for the graphics card, there is only one slot available).
I also have an M2 SSD installed, that also uses the pci lanes if i get it right. Tried to use a HDD with new live image installed instead.

But no luck.

rtai on the other hand runs absolutely stable, i already drove more than 1km with the test equipment

The following user(s) said Thank You: tommylight

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tommylight
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08 Jul 2025 22:06 #331547 by tommylight

Replied by tommylight on topic 7i77 lost connection while encoder counts (PREEMPT-RT)

OK, that only leaves the memory modules, so if there are two, try yanking one out and testing, then the other one and test again.
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Explanation for some of my replies:
I use a lot of Ryzen PC's, including this one i am typing on:
forum.linuxcnc.org/show-your-stuff/55173...thers-company#331546
And the rest on that topic, one thing i found out the hard way is that PCI-E issues will sometimes show as memory errors on Linux boot and DMESG, and easy to reproduce by using different GEN devices, mostly graphic cards, especially if using riser cable for it.

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