Questions tagged [kernel]
The kernel is the central component of the operating system and manages hardware, process scheduling, file systems, virtual memory paging, inter-process and network communication, etc.
490
questions
1
vote
2
answers
52
views
Switching between kernel versions in raspberry pi 4
My rpi4 is currently loading kernel 6.1.14-v7l+ at boot, while I have more installed:
$ ls /lib/modules
5.15.84+ 5.15.84-v7+ 5.15.84-v7l+ 5.15.84-v8+ 6.1.14+ 6.1.14-v7+ 6.1.14-v7l+ 6.1.14-v8+ ...
- 111
3
votes
1
answer
69
views
Uninterrupted, endless SPI transfer - is it possible?
I wrote a linux driver for SPI protocol so RaspberryPi could communicate with my device that's using serial data transfer (the device has clock input and data output). It almost works, the problem is ...
- 133
2
votes
1
answer
34
views
Which blacklist.conf file version should I use to block the loading of the nouveau module?
I want to block the loading of the nouveau kernel module but in my /usr/lib/modprobe.d directory I have 2 blacklist.conf files:
blacklist_linux-raspi_5.15.0-1023-raspi.conf
blacklist_linux-raspi_5.15....
- 33
3
votes
2
answers
129
views
Why does `apt install linux-headers-generic` install old headers for the newest stable kernel?
I can boot a vanilla pi-4 with kernel8.img (Feb 15, 2023) to release 5.15.84-v8+ ... the pi-4 runs admirably.
# ls -ltr /boot/*.img
-rwxr-xr-x 1 root root 8194604 Feb 15 18:02 /boot/kernel8.img
# ...
- 133
0
votes
0
answers
48
views
Rename gpio-keys input device with label attribute
I have added the following line to my boot.txt to attach a push button input device to my system:
dtoverlay=gpio-key,gpio=26,active_low=0,keycode=256,label="myButton"
Once the OS is booted, ...
- 133
-2
votes
1
answer
58
views
Unable to 'make' basic kernel module
I'm trying to write a basic kernel module for my Raspberry Pi V4 Model B.
I tried to follow the steps at puddleofcode.com and How compile a loadable kernel module without recompiling kernel.
obj-m := ...
- 121
2
votes
0
answers
64
views
Improving file system performance on emulated Raspberry Pi
I am emulating a Raspberry Pi 3B running the latest Raspberry Pi OS Lite on qemu-system-arch64 but the file I/O speed is woefully slow.
This is my QEMU command, for starting my virtual machine.
sudo ...
- 121
1
vote
0
answers
42
views
No FIQ.h on Raspberry PI3B+
I was exploring the FQI routine for ARM processors. I noticed that most Linux kernels provide a fiq.h header file yet my RPi does not seem to have it. Using find does not return anything. My Linux ...
- 21
0
votes
0
answers
62
views
Raspberry Pi 3B QEMU doesn't boot but without an error message
I am trying to boot a Raspberry Pi 3B in QEMU using Manjaro ARM and a custom kernel (forked from mainline). The problem is that it doesn't show any error, it just stops printing new messages. The last ...
- 11
1
vote
1
answer
161
views
Hardware reference manual for ethernet mac in bcm2711
I recently bought a RPi4 model B for learning the Linux device drivers particularly the Ethernet MAC. I was looking for a documentation, something similar to this one which is for AM335x from TI, but ...
- 131
0
votes
0
answers
41
views
embeded CM3+ with UI application freezing up
System information
OS: Custom build linux with Yocto (version Dunfell)
GPU: VideoCoreIV on a RaspberryPi CM3+
Kernel: Linux some-hostname 4.19.126-v7 #1 SMP Tue Apr 5 15:43:00 UTC 2022 armv7l GNU/...
4
votes
3
answers
538
views
Raspberry Pi 3b+ - Turning off power LED from /boot/config.txt no longer works with kernal 5.15.56-v7+
I successfully turned off all my LEDs on my Raspberry Pi 3B+ according to this guide, by adding these lines in the /boot/config.txt:
[all]
# Turn off Power LED
dtparam=pwr_led_trigger=none
dtparam=...
- 143
1
vote
0
answers
71
views
On Raspberry Pi 4 with Ubuntu 22.04 don't work ioctl
I have Raspberry Pi 4 (aarch64 Cortex-A72) with OS Ubuntu 22.04 LTS 64-bit installed. I try read frame from webcam.
When I run this code:
if (ioctl(fd, VIDIOC_DQBUF, &buf) < 0) {
std::cout &...
- 111
2
votes
1
answer
101
views
Should the lxpanel Updater be used for the kernel and bootloader?
TL;DR:
As of this writing, the lxpanel Updater applet somehow only updates the kernel modules without changing the system release. I want to know why, and point out that apt resolves issues.
Backstory:...
- 21
0
votes
0
answers
51
views
Wifi Direct: Intermittent Issue with Wifi Device
I'm working on making a "Wifi Direct" RPi device (Raspberry Pi 4). Generally, if I run wpa_cli p2p_group_add, it creates the device p2p-wlan0-0 which shows up in ifconfig. However, about 1 ...
- 111
0
votes
0
answers
75
views
spi driver fails to load sometimes
I am getting an error when I try to load a driver for a spi device, but only about 50% of the time. I was hoping all I would have to do is hook up the devices reset pin, but I'm not sure that does ...
- 21
0
votes
0
answers
32
views
Install custom kernel(musl)
I have cross compiled custom kernel with ARCH=arm64 CROSS_COMPILE=aarch64-linux-musl- argument, virtualization support(kvm, xen) and somehow hardened(selinux, tomoyo, apparmor) now i want to install ...
- 1
0
votes
0
answers
46
views
Raspberry Pi Zero W libcamera kernel error
I want to use Rpi Zero W to send the live video stream using libcamera-video as described on the Rpi documentation page. However, after ~5-10 min camera stream breaks and kernel error pops up:
...
- 123
0
votes
0
answers
190
views
Problems with three USB cameras using OpenCV
I am currently working on a project with a Raspberry PI 3 b+. The idea is to film a surface with 3 USB cameras to locate objects. To test if my setup works, I wanted to stream their content to three ...
1
vote
1
answer
51
views
Error after simple packages update of raspbian bulleyes: /etc/kernel/postinst.d/apt-auto-removal: 15: mv: not found
After did as usually commands sudo apt update and sudo apt upgrade I am facing the following issue:
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 5.10.103+ /boot/kernel.img
/etc/kernel/...
- 21
0
votes
1
answer
651
views
Direct Access RPI-4 GPIO Interrupt
I am working on the RPI-CM4 board with raspbian buster OS.
I am building an application to get interrupt events from the GPIO pin, fluctuating its state @20usec.
I have tried the following things...
...
- 57
0
votes
0
answers
234
views
Kali Linux end Kernel Panic exitcode=0x0000000b
when I start my Raspberry Pi 4 with 4GB Ram comes the following:
{1.174936} ---{ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000000 }---
Can anyone help me?
Thank you in ...
- 1
0
votes
1
answer
63
views
BME280 via DTOverlay Fails, But using 100% python query works!
BME280 via DTOverlay Fails, But using 100% python query works!
Enable DTOverLay for BME280 in /boot/config.txt...**
dtparam=i2c_arm=on
dtoverlay=i2c-sensor,bme280,addr=0x77
# i2cdetect -y 1
0 1 ...
0
votes
0
answers
135
views
Building the Kernel error
I was following the steps defined here
https://www.raspberrypi.com/documentation/computers/linux_kernel.html#updating-your-kernel
and when executing this command, I get the next errors:
pi@...
- 1
0
votes
0
answers
115
views
sysfs blocks gpio pins after one minute from restart
I am using Raspberry pi 4b with Linux raspberrypi 5.10.63-v7l+. I am writing simple userspace program for control one GPIO by ioctl() (in my case GPIO 13 for example). However program responses: ...
- 1
1
vote
1
answer
215
views
/dev/i2c is not showing Raspberry Pi4 running on Android
I am using AOSP android 11 in the RPi4. I have enabled the i2c in config.txt using the param dtparam=i2c_arm=on.
The i2c is showing in the /sys/bus/i2c/devices/i2c-1 but /dev/i2c is not listing in the ...
-1
votes
2
answers
292
views
Executing sh script on (first) startup using systemd.run causes black screen/shutdown
I'd like to execute a shell script for some pre-configuration tasks on the first boot. I found systemd.run like this in the cmdline.txt on the boot partition:
console=serial0,115200 console=tty1 root=...
- 167
0
votes
1
answer
399
views
CM4 USB connection issues
We have rolled our own board for the CM4 and the problem occours when connecting an UMTS stick (Huawei E3531 HiLink) to USB. The CM4 starts to disconnect and reconnect the stick continuously.
This ...
- 3
0
votes
0
answers
22
views
Not booting after shutdown [duplicate]
We are putting rpis in one of our products and we have a few dozens of units already in use. We currently observe a very annoying problem - whenever it shuts down or is issued reboot it won't boot ...
- 237
2
votes
1
answer
211
views
Delay booting devices or booting the kernel
BLUF: I'd like to see if there's a solid way to delay the boot-up of the kernel to keep a Pi from sucking up a lot of juice out of the gate, or the USB bus to delay the devices' boot-up until after ...
- 21
0
votes
1
answer
769
views
Kernel can't load modules on Raspberry Pi 3B+
I have a Raspberry Pi 3B+ that boots from its SD card but reads its root filesystem from an external hard drive connected by USB. Everything has been working well since I set that up until I tried to ...
0
votes
1
answer
655
views
Ubuntu: upgraded kernel is not selected in the next boot
My Raspberry Pi 4 was originally loaded with Ubuntu 21.04, but after yesterday's release of 21.10, I upgraded using the do-release-upgrade command.
Among the other upgraded packages, there was a new ...
- 101
-1
votes
1
answer
102
views
What are the reasons for kernel taint on OpenWRT 21.02 fresh install on Raspberry Pi 4?
I'm currently running a stock build of OpenWRT 21.02, on a fresh install in Raspberry Pi 4 and I'm getting a tainted kernel error 1024.
Anyone else experiencing this and any idea what may be causing ...
0
votes
1
answer
1k
views
Compile RPi 3B+ Kernel 5.10 with preempt_rt patch
I'd like to change the default RPi 3B+ kernel to use the version 5.10 with the rt_preempt patch. To accomplish this, I'm trying to follow this guide and the official Raspberry guide, adapting some ...
- 3
0
votes
0
answers
59
views
Kernel not updating with atp-get update/upgrade - Ubuntu 21.04 - TFTP boot NFS root
I am gradually getting a Pi 4 cluster up and running, and have hit an issue I have not been able to resolve with google. It is my understanding of the Ubuntu boot process that is lacking really.
I ...
- 101
0
votes
1
answer
643
views
Can't install packages anymore because of raspberrypi-kernel failure: bad dkms conf file
I somehow messed something up with my Raspbian; it's a fairly new install on a RPi 3B+.
When I run sudo apt update and the sudo apt upgrade I get this error:
Reading package lists... Done
Building ...
- 113
0
votes
2
answers
358
views
SPI not getting enabled in Raspberry Pi 4 with custom-built Linux kernel
I have built Linux Kernel 5.10.36-v8 using Buildroot and using it into my Raspberry Pi 4B for the past few weeks. I recently wanted to enable SPI ports on the Raspberry Pi and followed the ...
- 1
0
votes
1
answer
531
views
Kernel panic when using apt on RPi Zero, RPi OS Buster
I’m getting ’kernel panic’ when I try to use apt (or apt-get) to install a package or update/upgrade; I’m using a Raspberry Zero W with the latest version of Raspberry Pi OS available on their website ...
- 11
3
votes
2
answers
3k
views
raspberry pi 4B no /dev/spidev0.0
As it says in the title my raspberry pi 4B is missing /dev/spidev0.0
I'm trying to use an adxl372 accelerometer with a raspberry pi 4B. I built a kernel with industrial io drivers and the proper ...
- 131
1
vote
3
answers
2k
views
Can I use the mainline kernel in my rasp? if not, why?
I noticed that when we compile a new kernel following the official documentation we use the linux fork from the raspberry foundation. Could I use the mainline kernel maintained by linus? Or is there ...
- 21
0
votes
0
answers
369
views
Incorrect kernel header downloaded
I need to install a tool in Raspberry pi 3B+ that needs kernel version 4.14. To install the tool, I need to install some kernel patches and need the headers for the installed kernel. On running
uname ...
- 13
0
votes
1
answer
497
views
How to disable kernel upgrade on Ubuntu Server 21 64 Bit on Raspberry Pi 4b?
How can I disable kernel upgrades on a fresh installation of Ubuntu Server 21 64-bit OS for arm64 architectures on a Raspberry Pi 4b with 4gb?
Based on this source, I tried:
sudo apt-mark hold 5.11.0-...
- 171
0
votes
1
answer
101
views
RPi 4 wrote 23GB of Log Files “urb status -32”
Raspberry Pi 4 with Raspbian 10 and kernel 4.19.71-rt24-v7l+
kern.log 12G
syslog 6.6G
sylog.1 4.5G
The log files are filled with usb 1-1.2: urb status -32. I just removed the log files yesterday and ...
- 101
0
votes
0
answers
331
views
How to extract aarch64 vmlinuz gzip image?
I am trying to PXE boot Ubuntu 20.04 aarch64 on the pi 4b but I am stuck at the point where I need to extract the kernel image vmlinuz-5.4.0-1028-raspi. I tried to zcat and pipe it out but I ended up ...
- 1
2
votes
3
answers
570
views
syslog and kern.log filling with: rc rc0: IR event FIFO is full!
I have a Pi that has recently developed a habit of maxing the SD card with syslog messages (somewhere in the hundreds per second) of the message: "Date/Time user kernel: [ 2257.432445] rc rc0: IR ...
- 105
0
votes
1
answer
6k
views
The following signatures couldn't be verified because the public key is not available / Resolving raspberrypi-kernel failed: Name or service not known
I would like to virtualize debian bullseye for raspberry on top of my jetson nano using qemu and kvm because it is necessary to install this repo :
https://www.hackster.io/stanton/smart-snoring-...
- 101
1
vote
1
answer
855
views
Raspberry Pi Zero W, berryboot would not boot
I am having difficulty installing berryboot on my pi zero. I followed countless guides and none seem to work. most guides tell me to download berryboot from here however the site does not have a ...
user132883
0
votes
1
answer
360
views
How to update/change the kernel without removing the SD card?
I have seen posts and tutorials dealing with updating the kernel, such as this one, but they all expect you to remove the SD card, rewrite it outside with a card reader and then plug it back in. Is it ...
- 21
2
votes
1
answer
2k
views
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
Raspberry Pi 4 8GB
Ubuntu 20.04.2 LTS
Before this happened, I was able to run a bunch of Docker containers without an issue. However, my Pi suddenly stopped working (wasn't able to SSH into it, wasn'...
3
votes
0
answers
227
views
How to write a Kernel module using SPI properly?
I have no experience writing kernel modules. I build some examples with gpio interrupts and they worked prety well. Now I want to use SPI from my kernel module and I will explain why I need it.
I am ...
