Debian 12 - 2.9.1 image for the Raspberry Pi 4b/400

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30 Nov 2023 10:11 - 30 Nov 2023 10:15 #286855 by flyingbrick
Last edit: 30 Nov 2023 10:15 by flyingbrick. Reason: I'm a potato

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30 Nov 2023 10:14 - 30 Nov 2023 10:16 #286856 by flyingbrick
Last edit: 30 Nov 2023 10:16 by flyingbrick.

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03 Dec 2023 17:39 #287108 by chuckp47
Hello. I'm new to the forum. During the day I'm an embedded firmware guy. I've built products using the RPi4 (CM4) and an Olimex Lime board. I want to use LinuxCNC to control an ornamental lathe. I've got an RPi5 here now, as well as a Mesa 7c81 with an RPi4 on its back. I know I have more questions than I can post right now, but I look forward to learning more here. I'm particularly interested in how the RPi5 port is coming.

Here's the result of the latency plot on the 4G RPi4b running the LinuxCNC 2.9.1 Debian 12 Bookworm PREEMPT-RT ISO.  Doesn't look too good,  Is this normal?  We're planning to use DM542 style drivers, so maybe it doesn't have to be perfect, but...  I guess I should try the RTAI based one.  Or maybe I should just jump into the RPi5 project?
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09 Dec 2023 10:52 #287634 by elovalvo

Hello. I'm new to the forum. During the day I'm an embedded firmware guy. I've built products using the RPi4 (CM4) and an Olimex Lime board. I want to use LinuxCNC to control an ornamental lathe. I've got an RPi5 here now, as well as a Mesa 7c81 with an RPi4 on its back. I know I have more questions than I can post right now, but I look forward to learning more here. I'm particularly interested in how the RPi5 port is coming.

Here's the result of the latency plot on the 4G RPi4b running the LinuxCNC 2.9.1 Debian 12 Bookworm PREEMPT-RT ISO.  Doesn't look too good,  Is this normal?  We're planning to use DM542 style drivers, so maybe it doesn't have to be perfect, but...  I guess I should try the RTAI based one.  Or maybe I should just jump into the RPi5 project?

If you are interested with a Pi 5 and the image you find here
forum.linuxcnc.org/9-installing-linuxcnc...pi-5?start=60#287616
the graph of latency-hystogram is this
 
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09 Dec 2023 11:07 #287638 by cornholio

Hello. I'm new to the forum. During the day I'm an embedded firmware guy. I've built products using the RPi4 (CM4) and an Olimex Lime board. I want to use LinuxCNC to control an ornamental lathe. I've got an RPi5 here now, as well as a Mesa 7c81 with an RPi4 on its back. I know I have more questions than I can post right now, but I look forward to learning more here. I'm particularly interested in how the RPi5 port is coming.

Here's the result of the latency plot on the 4G RPi4b running the LinuxCNC 2.9.1 Debian 12 Bookworm PREEMPT-RT ISO.  Doesn't look too good,  Is this normal?  We're planning to use DM542 style drivers, so maybe it doesn't have to be perfect, but...  I guess I should try the RTAI based one.  Or maybe I should just jump into the RPi5 project?

 


Just run the latency test without the base thread. There's no need for a base thread when using a Mesa card.
Be warned the hm2_rpspi driver does not work with the RPi5, it requires a rewrite to suit the RPi5 hardware, IO has been moved to the RP1 chip rather than being on the processor itself, I spent a while with this, hence the reason the RPi5 is in a drawer ATM. If you want to reduce the latency disable sound, wfi & bluetooth.

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