On 5/26/23 15:34, Rod Webster wrote:
@gene, there are many ways to get ARM64 onto a pi4b.
One way is to download a Debian Bookworm image from Debian:
https://raspi.debian.net/daily-images/ and install it using the normal
Raspberry imager tool
This will give you a CLI only with a root user with no password.
Add yourself a user, add him to the sudoers group, add a password to root
Add PREEMPT_RT kernel: apt-install linux-image-rt-arm64 linux-headers-rt-arm64
Add a desktop: apt install task-xfce-desktop
Install linuxcnc from repositories: apt install linuxcnc-uspace
linuxcnc-uspace-dev
reboot and log in as root one last time
open the desktop xfce : startx
Reboot and login again as your user and run linuxcnc from the CNC menu.
Be disappointed with latency, add a few optimisations and it will be
at about 50-90k
50 to 90k of what? I'm getting about 12 u-secs from the kernel I quoted,
provided a web browser like FF is not running.
For more detail see my instructions here
https://docs.google.com/document/d/1S0K-UBlXnsYC9S_BVSRpzEamp-w44BIzSBl7-o10b_0/edit?usp=sharing
Debian Bookworm becomes the official Debian version in about 2 weeks
on June 10 so its stable and quite safe to use now..
Rod Webster
1300 896 832
+61 435 765 611
Vehicle Modifications Network
www.vehiclemods.net.au
Thanks, take care & stay well Rod.
On Sat, 27 May 2023 at 02:18, gene heskett <ghesk...@shentel.net> wrote:
On 5/25/23 21:21, Alec Ari via Emc-developers wrote:
Yes but it's been awhile, I've actually done some U-Boot development in the
past. This problem with the linker is not kernel related though.
Alec
Well, the reason I asked is that the kernel I built and have been
running, on the rpi4b that is running my Sheldon lathe, is now several
years long in the tooth, and is armhf, and I expect by now the arm64's
have caught up or surpassed it in latency-test. I think I was first to
run linuxcnc on a pi, starting with a pi3b.
The foundation does not approve of realtime stuff, so I can't ask on
their forums, I'm black holed there.
The install is dirt simple for what I have done. open the tarball you an
get from my web site in my sig, find 2 directories, copy them over the
same name on the sd card with mc, put the sd card back in the pi % power
up, done.
Linux rpi4.coyote.den 4.19.71-rt24-v7l+ #1 SMP PREEMPT RT Thu Feb 6
07:09:18 EST 2020 armv7l GNU/Linux
has been running from power failure to power failure since then but
power failures aren't as it has a small ups and I have a 20kw standby
power running long before the ups battery runs out.
On Friday, May 26, 2023 at 12:00:10 AM UTC, gene heskett <ghesk...@shentel.net>
wrote:
On 5/25/23 19:13, Alec Ari via Emc-developers wrote:
16.0.4
Just throwing this out there; I can write up the docs on how to use it, push
the image to Github, finalize the installer and then anyone can try getting the
last bits sorted out hands on. Latency and system performance surpasses Debian
by a mile, there's also four different PREEMPT_RT kernels to choose from. Some
kernels may have lower latency than others depending on the platform (i.e.
Intel vs AMD) which is why I made a few. Adjustments include changes to RCU/CPU
time keeping and IOMMU support.
Alec
Have you tested any kernels on u-booting arm64's?
Cheers, Gene Heskett.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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_______________________________________________
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.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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