linuxcnc-2.8.0-pi4.img - no USB on raspberry pi 4 - 8GB & 2GB

No work around that i have seen yet, i've not had time to see how a manual install works.

So i downloaded [2020-08-20-raspios-buster-armhf.img] and followed the instructions [gnipsel.com/linuxcnc/uspace/rpi4-rt.html] to install PREEMPT RT, no issues in compiling and installing, at reboot i got the errors

xhci_hcd 0000:01:00.0: can't setup: -110
xhci_hcd 0000:01:00.0: init 0000:01:00.0 fail, -110

And the machine fails to boot any further, intermittetent green flashing light. So looks like an issue with the RT kernel. This is likely because using external USB SSD.

I also tried the pre-made iso [unofficialpi.org/Distros/RealtimePi/nightly/] which gave a whole load of other errors and failed to boot any further.

Submitted bug report [github.com/raspberrypi/linux/issues/3976]

Looks like recognised issue, may be being worked on. [github.com/raspberrypi/linux/issues/3713]

I wanted to ask, what is the conclusion of this thread for beginners?
Will it ever be possible to use "sudo apt-get update" for RPI 4?

Is this the end for the current LinuxCNC + RPI 4?

I tried to find a 'stock Buster install' and only found Raspberry PI OS images.
The only image that mentions Buster is for a PC or MAC.
www.raspberrypi.org/documentation/instal...ing-images/README.md

I used an image i had earlier saved 2020-05-27-raspios-buster-full-armhf.img.

What's the name of the image you used and where is it to be found?

I used the image I had and followed the instructions at
linuxcnc.org/docs/2.8/html/getting-start...lling_on_raspbian_10

but had the 'no mouse no keyboard' symptom
when i arrived at
"""
install the realtime kernel
sudo apt-get install linux-image-4.19.71-rt24-v7l+
7) Install linuxcnc (a reboot may be required prior to installing)
"""
I pre-emptively rebooted before step 7, tho I was not prompted to reboot.
After the desktop reappeared I had no mouse or keyboard ( numlock led fails )

Did I go wrong with the buster image and/or was the reboot the mistake?
thx
TomP

Hi think for the moment do not doing upgrad allow to have somehting working
if you dothis will break the usb.