Raspberry Pi 4 Tutorial - fatal error
23 Aug 2019 23:04 #143016
by BigJohnT
Raspberry Pi 4 Tutorial was created by BigJohnT
I'm working on a tutorial for the Raspberry Pi 4B to run Mesa Ethernet cards but to my surprise the latency is much better than I thought at <30us. Anyway anyone that has a Rpi4 and wants to run through the tutorial and see if I have anything that is absolutely not clear for a Linux beginner please do.
I'm using Rasbian 10 patched with the preempt rt kernel LinuxCNC Uspace and a blank slate window manager OpenBox.
As usual the Uspace tutorials are here: gnipsel.com/linuxcnc/uspace/
JT
I'm using Rasbian 10 patched with the preempt rt kernel LinuxCNC Uspace and a blank slate window manager OpenBox.
As usual the Uspace tutorials are here: gnipsel.com/linuxcnc/uspace/
JT
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24 Aug 2019 06:55 - 24 Aug 2019 06:57 #143058
by Clive S
I have a 404 error with github.com/jethornton/7i76
Replied by Clive S on topic Raspberry Pi 4 Tutorial
As usual the Uspace tutorials are here: gnipsel.com/linuxcnc/uspace/
JT
I have a 404 error with github.com/jethornton/7i76
Last edit: 24 Aug 2019 06:57 by Clive S.
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24 Aug 2019 11:00 #143079
by BigJohnT
Replied by BigJohnT on topic Raspberry Pi 4 Tutorial
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25 Aug 2019 19:48 #143166
by blazini36
Replied by blazini36 on topic Raspberry Pi 4 Tutorial
Have you tried it with the SPI cards yet? Doesn't look like the 7c80 has been officially released yet but the 7c81 seems to be available.
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25 Aug 2019 23:30 #143174
by BigJohnT
Replied by BigJohnT on topic Raspberry Pi 4 Tutorial
No, Peter is going to send me one with my next order so I can try it out. I am mainly interested in getting the Ethernet cards working well with the Rpi4 which they do. Latency is crazy low with my setup.
JT
JT
The following user(s) said Thank You: spma
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28 Aug 2019 20:57 #143483
by andypugh
Replied by andypugh on topic Raspberry Pi 4 Tutorial
You know that there is an experimental SD card image with most of this already done?
www.linuxcnc.org/dists/buster/2.8-uspace/
www.linuxcnc.org/dists/buster/2.8-uspace/
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29 Aug 2019 12:19 - 29 Aug 2019 12:22 #143549
by BigJohnT
Replied by BigJohnT on topic Raspberry Pi 4 Tutorial
Yes I know about it, but I wanted to understand how to do it and also use the OpenBox window manger to see if I could get the latency down which I did get the latency to be <30us. Also at 2.9GB I doubt I could manage to download that during free time for me and with a 10GB limit for each month I run out pretty quick.
JT
JT
Last edit: 29 Aug 2019 12:22 by BigJohnT.
The following user(s) said Thank You: HueyHQ
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29 Aug 2019 21:31 #143595
by HueyHQ
Replied by HueyHQ on topic Raspberry Pi 4 Tutorial
Thanks BigJ. I'm curious about the RPi4 implementation, and appreciate you sharing your experiences with it. I'm not ready to take the plunge yet, but have been waiting for some more experienced users have a crack at it.
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29 Aug 2019 23:04 #143614
by BigJohnT
Replied by BigJohnT on topic Raspberry Pi 4 Tutorial
The only thing I've come across is a bit of an issue with vtk which is used by QtPyVCP but we are working on resolving that.
JT
JT
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30 Aug 2019 16:25 #143670
by zanga
Replied by zanga on topic Raspberry Pi 4 Tutorial
On the last page 'extras', since I was trying to do most of this via ssh, I forgot to enable root access via ssh before I logged out... it's easier if you just enable this at the same time you set the password for root
To enable SSH login for a root user on Debian Linux system you need to first configure SSH server. Open /etc/ssh/sshd_config and change the following line:
FROM:
PermitRootLogin without-password
TO:
PermitRootLogin yes
Once you made the above change restart your SSH server:
# /etc/init.d/ssh restart
[ ok ] Restarting ssh (via systemctl): ssh.service.
To enable SSH login for a root user on Debian Linux system you need to first configure SSH server. Open /etc/ssh/sshd_config and change the following line:
FROM:
PermitRootLogin without-password
TO:
PermitRootLogin yes
Once you made the above change restart your SSH server:
# /etc/init.d/ssh restart
[ ok ] Restarting ssh (via systemctl): ssh.service.
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