Raspberry Pi 4

My rpi4 came with small heat sinks. That plus a fan seems to keep it in the 40-50c range.

Perhaps the wrong topic...on the off chance this is RPI4 / 4.19.y-rt related...appreciate any guidance.

I've been getting these:

I'm running GMOCCAPY and I am on master (pretty much).

svanteg wrote:

Perhaps the wrong topic...on the off chance this is RPI4 / 4.19.y-rt related...appreciate any guidance.

I've been getting these:

[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
python: ../../src/xcb_io.c:263: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
/home/pi/cnc/linuxcnc/scripts/linuxcnc: line 896:  2334 Aborted                 $EMCDISPLAY -ini "$INIFILE" $EMCDISPLAYARGS $EXTRA_ARGS
Shutting down and cleaning up LinuxCNC...

I'm running GMOCCAPY and I am on master (pretty much).

I'm more fam with axis, but I have NOT seen such an error. So I've no clue if thats related or not, Its a data point only.

I have a rebuild under way after hand patching the rpspi files with the rp4 patch.. That might make it run on a pi4, but I have got to collect more adapters before I can swap the 3 out. Buster straight from a debian-arm netinstall is arm64, not armhf, so the rpspi code may need more editing yet. Buster from the debian-arm install sure runs nice once you nuked enough net stuff to make a static setup work.

Does anyone know if the RealtimePi guy has a realtime kernel that uses the new broadcom video code on the pi3b's yet. That would certainly be a heck of an improvement as i brings glxgears, pulled out to full screen, up to very close to 30 fps.
Thats about 20x faster than I'm getting on a stretch install on the pi3b. We're getting there.

The above patches aren't quite enough. Built on a pi3b running buster, which is arm64, rpspi doesn't recognize its running on a pi3b, so it bails out. Should it still run as normal on arm64 as opposed to armhf?

Thanks.

Got linuxcnc working on my RPI4 working over GPIO. Thanks for the information, guys!
still working on hardware stepping on a FPGA, but just wanted to share my progress so far.
Whenever i'm done this will control a Prolight mill.

Can not get Andy´s image to boot. Is there any other img to download?
linuxcnc-pi4.img.zip 2019-07-21 09:34 2.9G

Started your way, boy does this take time..... phuuu....

And then the install comes to a stop

sudo apt install git >>>>>>>>>>>>>>>>>> NO GO

/usr/lib/arm-linux-gnueabihf:
Bus error
dpkg: error processing package libc-bin (--configure):
installed libc-bin package post-installation script subprocess returned error exit status 135
Errors were encountered while processing:
libc-bin
E: Sub-process /usr/bin/dpkg returned an error code (1)

pi@plasma:~ $ git clone --depth=1 github.com/raspberrypi/linux -b rpi-4.19.y-rt
-bash: git: command not found
pi@plasma:~ $