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

Yes, I really only ever expected it to be used with Mesa Ethernet or SPI cards when I made the images / kernels.

Can those with this problem please state exactly which model of Pi they are using?

One possible problem is that the 8GB Pi needs a 64bit kernel if it is going to address more than 4GB.

I have the 8GB Pi4 and lose USB when booting linuxcnc-2.8.0-pi4.img. I also get the other errors people have mentioned.

Stock Pi OS works just fine.

I haven't tried restricting the memory to <4GB yet.

johnp wrote: I have the 8GB Pi4 and lose USB when booting linuxcnc-2.8.0-pi4.img.

Have you tried any of the updated kernels that I keep building?

andypugh wrote:
Have you tried any of the updated kernels that I keep building?

Sorry but where do I find these updated kernels ?

In case I have tried the instructions here again
linuxcnc.org/docs/2.8/html/getting-start...lling_on_raspbian_10

but after Step 6.
added total_mem=3072 to /boot/config.txt
rebooted

before completing Step 7.

I now have USB working and can run the latency test.



sudo rpi-eeprom-update
BCM2711 detected
VL805 firmware in bootloader EEPROM
BOOTLOADER: up-to-date
CURRENT: Thu 03 Sep 2020 12:11:43 PM UTC (1599135103)
LATEST: Thu 03 Sep 2020 12:11:43 PM UTC (1599135103)
FW DIR: /lib/firmware/raspberrypi/bootloader/default
VL805: up-to-date
CURRENT: 000138a1
LATEST: 000138a1

uname -a
Linux raspberrypi 4.19.71-rt24-v7l+ #1 SMP PREEMPT RT Fri Jan 1 21:15:16 GMT 2021 armv7l GNU/Linux

johnp wrote: but after Step 6.
added total_mem=3072 to /boot/config.txt
rebootedx

I am confused now, all the links to the max memory issue only mentioned 64 bit kernels.

I will have one last go tonight: Recreate the SD card image with the latest kernel, then make a second version with the memory limit in the config file.