Raspbery Pi 4 - 4GB or 8GB - which one or both?

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25 Oct 2021 12:36 #224254 by JacquidR
Hi there,

Pease advise for which Raspberry Pi4 the available downloadable image "LinuxCNC 2.8.1  Raspberry Pi OS based on Debian 10 Buster " .

The 4GB or the 8GB? Or both? 

I am asking because there were previously issues with USB etc on the 8GB and now I am not sure if this is resolved with this latest available image. And I want to buy more pies but can't unless I know which RAM to purchase.

Thank you.
Regards, Jacqueline du Rand
 

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27 Oct 2021 11:59 #224494 by andypugh
I admit that I haven't tried running on a Pi for some time, and I created the SD images on the LinuxCNC site.

I would suggest going with the 4GB, mainly as it is cheaper and 4GB is enough for LinuxCNC.

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27 Oct 2021 12:39 #224501 by Aaroncnc
Not to hijack the thread but.
Why no 64 bit image and only 32bit?

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27 Oct 2021 12:42 #224502 by andypugh

Not to hijack the thread but.
Why no 64 bit image and only 32bit?

Simply that at the time I built the images Raspian was 32 bit and the pre-packaged preempt-rt kernel was 32-bit. 
(And, also, the buildbot that makes the debs was 32-bit) 

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27 Oct 2021 17:08 #224525 by Aaroncnc

Not to hijack the thread but.
Why no 64 bit image and only 32bit?
Simply that at the time I built the images Raspian was 32 bit and the pre-packaged preempt-rt kernel was 32-bit. 
(And, also, the buildbot that makes the debs was 32-bit) 

Will there be a 64bit image added?
I know there are a few build hidden in some threads but some users may have a hard time finding the latest one.
I know from my testing the 64bit images have better latency with my setup. 

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28 Oct 2021 20:06 - 28 Oct 2021 20:23 #224610 by elovalvo
At this link you can find the 64-bit deb packages for LinuxCNC version 2.8.2 and 2.9.0~pre0

forum.linuxcnc.org/9-installing-linuxcnc...lem?start=120#224608

Not to hijack the thread but.
Why no 64 bit image and only 32bit?
Simply that at the time I built the images Raspian was 32 bit and the pre-packaged preempt-rt kernel was 32-bit. 
(And, also, the buildbot that makes the debs was 32-bit) 

Will there be a 64bit image added?
I know there are a few build hidden in some threads but some users may have a hard time finding the latest one.
I know from my testing the 64bit images have better latency with my setup. 



 

Last edit: 28 Oct 2021 20:23 by elovalvo.

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31 Oct 2021 10:28 #224756 by JacquidR
Thank you Andy.

We are also picking up issues now with the RPi freezing.
Will try the 64bit shared below by elovalvo. Hopefully it is resolved.

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06 Nov 2021 03:11 #225462 by EricKeller
Mine doesn't freeze with Andy's image. I suspect you have a power supply problem.

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08 Nov 2021 09:35 #225645 by JacquidR
So with Elovalvo's image it doesn't freeze, however we cannot get G71 working on the 2.9 pre-release available for the RPis.

We have checked the power and no issue with power. 3A and 5V from the recommended RPi power supply.

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08 Nov 2021 13:36 #225684 by andypugh
G71 not working is almost certainly unrelated to power supply.

How does it not work. Have you tested with known-good sample files?

There should be three files in ~/linuxnc/nc_files/(sample?)/lathe_G7*

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