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

I found the following at - wiki.debian.org/RaspberryPi4

- USB doesn't work up to kernel 5.7 for the hardware variant of PI4 with 8GB RAM
- This issue has a fix in kernel 5.8 (currently in experimental): lkml.org/lkml/2020/5/5/998

But I'm not clear if the build image here is running debian

so no usb period after startup? do they power up at all?

i havent tried it on my 8gb yet, but here is what rpi forum says, seems related to the topic at hand

www.raspberrypi.org/forums/viewtopic.php?t=287340
www.raspberrypi.org/forums/viewtopic.php?t=285563

My 8GB powers up all the way through to the desktop, just fails to start USB during boot (see errors logged above), so no keyboard / mouse.

Hi all,

Having the same issue with my pi4 8GB. No USB after boot.

What's the current workaround? I'm very new to LinuxCNC so this also my first install.

Kind regards,
Brett.

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 ]