linuxcnc-2.8.0-pi4.img - no USB on raspberry pi 4 - 8GB & 2GB
12 Jan 2021 07:03 #195017
by tjtr33
Replied by tjtr33 on topic linuxcnc-2.8.0-pi4.img - no USB on raspberry pi 4 - 8GB & 2GB
short story: on my RPI4 4G the loss of usb is is due to >= 4G mem.
i have a full install now by adding
total_mem=3072
to /boot/config.txt
i got the fix from
www.cnx-software.com/2019/11/04/raspberr...ork-on-ubuntu-19-10/
I did the above
BEFORE installing linuxcnc-uspace
AFTER rt kernel install
( i tried installing rpi-eeprom but it was already latest)
the bad news, chromium browser wont run
complaing no suitable sandbox
i have no browser right now
but can run latency tests
i edited cmdline.txt and added
isolcpus=1,2,3 idle=poll
then for Samco's time spike
sudo apt-get install ntp
rebooted fine with usb mouse and kbd and wifi
10 minutes of aletency-histogram --base 50000 --servo 1000000
with 4 glcgears
has
base -44 +39 servo -152 +158
there's hope for rpi software stepping, esp if dblstep is fixed ( if reset pins are available... working on it.. NAP NAM not a programmer not a monkey )
tomp
i have a full install now by adding
total_mem=3072
to /boot/config.txt
i got the fix from
www.cnx-software.com/2019/11/04/raspberr...ork-on-ubuntu-19-10/
I did the above
BEFORE installing linuxcnc-uspace
AFTER rt kernel install
( i tried installing rpi-eeprom but it was already latest)
the bad news, chromium browser wont run
complaing no suitable sandbox
i have no browser right now
but can run latency tests
i edited cmdline.txt and added
isolcpus=1,2,3 idle=poll
then for Samco's time spike
sudo apt-get install ntp
rebooted fine with usb mouse and kbd and wifi
10 minutes of aletency-histogram --base 50000 --servo 1000000
with 4 glcgears
has
base -44 +39 servo -152 +158
there's hope for rpi software stepping, esp if dblstep is fixed ( if reset pins are available... working on it.. NAP NAM not a programmer not a monkey )
tomp
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12 Jan 2021 08:48 #195025
by andypugh
Replied by andypugh on topic linuxcnc-2.8.0-pi4.img - no USB on raspberry pi 4 - 8GB & 2GB
apt-get reinstall chromium will get the web browser back (but might leave the tool bar icon lunching Dillo...)
There might be more going on here than we at first thought.
The first fix was to add the USB eeprom firmware loader, as on the newer boards that it held in the OS not a ROM.
But if restricting the memory changes the behaviour, then something else is at play.
There might be more going on here than we at first thought.
The first fix was to add the USB eeprom firmware loader, as on the newer boards that it held in the OS not a ROM.
But if restricting the memory changes the behaviour, then something else is at play.
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12 Jan 2021 09:51 #195028
by antage
Could you post 'sudo rpi-eeprom-update' command output?
Replied by antage on topic linuxcnc-2.8.0-pi4.img - no USB on raspberry pi 4 - 8GB & 2GB
i tried installing rpi-eeprom but it was already latest
Could you post 'sudo rpi-eeprom-update' command output?
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12 Jan 2021 13:33 #195047
by tjtr33
Replied by tjtr33 on topic linuxcnc-2.8.0-pi4.img - no USB on raspberry pi 4 - 8GB & 2GB
longer testing with software stepgens shows rpi4 not suitable. I tried longer and longer Base threads and even at 100uS base I still get Unexpected Real Time delays errors. Base 100us servo 1000us, ntpd, isolcpus-1,2,3 idle=poll and ferror = 0.07. Its not up to software stepgen IMO. It is suited to use with hardware stepgens. TomP
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12 Jan 2021 13:43 #195050
by andypugh
Replied by andypugh on topic 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.
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14 Jan 2021 17:10 #195340
by andypugh
Replied by andypugh on topic linuxcnc-2.8.0-pi4.img - no USB on raspberry pi 4 - 8GB & 2GB
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.
One possible problem is that the 8GB Pi needs a 64bit kernel if it is going to address more than 4GB.
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16 Jan 2021 10:37 - 16 Jan 2021 11:12 #195525
by johnp
Replied by johnp on topic linuxcnc-2.8.0-pi4.img - no USB on raspberry pi 4 - 8GB & 2GB
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.
Stock Pi OS works just fine.
I haven't tried restricting the memory to <4GB yet.
Last edit: 16 Jan 2021 11:12 by johnp.
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16 Jan 2021 20:26 #195572
by andypugh
Have you tried any of the updated kernels that I keep building?
Replied by andypugh on topic linuxcnc-2.8.0-pi4.img - no USB on raspberry pi 4 - 8GB & 2GB
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?
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18 Jan 2021 11:06 - 18 Jan 2021 11:19 #195767
by johnp
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
Replied by johnp on topic linuxcnc-2.8.0-pi4.img - no USB on raspberry pi 4 - 8GB & 2GB
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
Last edit: 18 Jan 2021 11:19 by johnp.
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18 Jan 2021 12:07 - 18 Jan 2021 12:09 #195774
by andypugh
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.
Replied by andypugh on topic linuxcnc-2.8.0-pi4.img - no USB on raspberry pi 4 - 8GB & 2GB
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.
Last edit: 18 Jan 2021 12:09 by andypugh.
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