Last update of LinuxCNC Raspberry Pi4 USB does not work

andypugh wrote:

pauluzs wrote:

Have seen that repoitory only thing : Isn't the main Pi repository 32 bit?

The Pi repository can be compiled for any architecture (including RISC and MIPS). I compiled an arm64 kernel yesterday using it, but it won't install as even a Pi set up with a (stock) 64 bit kernel has a 32-bit userspace and rejects an arm64 kernel deb.

The Pi4 is arm64 bits and i wanted to skip compiling a whole new kernel for that and rather take the shortcut.

LinuxCNC does not really benefit from 8GB of memory. (And, as the LinuxCNC armhf image is 32 bits, couldn't use it anyway)

uname -a
Linux rpi4-20201112 5.9.0-0.bpo.5-rt-arm64 #1 SMP PREEMPT_RT Debian 5.9.15-1~bpo10+1 (2020-12-31) aarch64 GNU/Linux

Does Linuxcnc install and run (in realtime) on that system?

My understanding (possibly wrong) is that the Pi kernel has significant differences from a vanilla arm kernel, which is why we have been working with the forked Pi kernel sources.

andypugh wrote:

To be generally usable, the kernel needs to work with the LinuxCNC packages from the buildbot.

The point of making kernel and application packages is so that users don't have to compile from source.

andypugh wrote:

Yes, that's my point.

The LinuxCNC-served kernel .deb needs to be compatible with the LinuxCNC-served package.

Or, alternatively, we give up.

i did manage to compile linuxcnc master from source

linuxcnc-doc-cn_2.8.1_all.deb
linuxcnc-doc-cn_2.9.0~pre0_all.deb
linuxcnc-doc-en_2.8.1_all.deb
linuxcnc-doc-en_2.9.0~pre0_all.deb
linuxcnc-doc-es_2.8.1_all.deb
linuxcnc-doc-es_2.9.0~pre0_all.deb
linuxcnc-doc-fr_2.8.1_all.deb
linuxcnc-doc-fr_2.9.0~pre0_all.deb
linuxcnc-uspace-dbgsym_2.8.1_arm64.deb
linuxcnc-uspace-dbgsym_2.9.0~pre0_arm64.deb
linuxcnc-uspace-dev_2.8.1_arm64.deb
linuxcnc-uspace-dev_2.9.0~pre0_arm64.deb
linuxcnc-uspace_2.8.1_arm64.deb
linuxcnc-uspace_2.9.0~pre0_arm64.deb

#fix missing python-gtksourceview2 for buster
	sudo apt install wget -y 
	wget http://ftp.debian.org/debian/pool/main/p/pygtksourceview/python-gtksourceview2_2.10.1-3_arm64.deb
	sudo apt install ./python-gtksourceview2_2.10.1-3_arm64.deb
	rm python-gtksourceview2_2.10.1-3_arm64.deb
#Install devscripts, used to build .deb packages
	sudo apt install devscripts -y	

#Get linuxcnc source
	git clone git://github.com/linuxcnc/linuxcnc.git linuxcnc-dev
#Change into linuxcnc-dev directory
	cd linuxcnc-dev
#Select linuxcnc branch (master, 2.8)
	git checkout master
	git branch
#Configure linuxcnc uspace	
	./debian/configure uspace
#build and install the build dependencies .deb package
	sudo mk-build-deps -i
#Build the .deb  package for linuxcnc
	dpkg-buildpackage -b -uc	
#Install the created linuxcnc .deb package
	sudo apt install ../linuxcnc-uspace_2.9.0~pre0_arm64.deb	

andypugh wrote:

I suspect that the debian packages made by that repository do not copy across all the files that the manual process does.

(This is with a brand-new 2GB Pi4. Maybe I should have got the 8GB one to be a better test, but it is just that bit too expensive a thing for me to buy without needing.)