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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.

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Pi3 freezes on boot when display_rotate=1

I've been struggling with an issue with my Pi. I have a 2560 x 1440p HDMI screen that i've been trying to get to work. After getting the HDMI timings and settings from the manufacturer it shows the ...
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22 views

How to get maximum GPIO output speed in Kernel module?

I'm writing a Linux kernel module on RPi2 to push an array to RGB Led matrix, so I want to have maximum speed of GPIO to reduce the 'flick' when it run Bit Angle Modulation. According to this site, ...
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3answers
63 views

Stuck with the old kernel

I did recently an updated (sudo apt-get updated && sudo apt-get dist-upgrade) on my 3 raspberies. Two RPI 3B, and one RPI Zero W. The strange thing is that the raspberries that I installed ...
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42 views

Configure SPI from Kernel Space by writing to the SPI Registers

I'd like to write my own SPI driver to configure the SPI interface by means of writing to the CS, FIFO, and CLK SPI registers. I have disabled the SPI interface in raspi-config. I followed the ...
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1answer
86 views

Run a script when wifi is connected to a particular wifi network?

My Raspberry pi is connected to my home wifi network. This wifi network have a captive portal and hence each time I need to sign in the captive portal to use the internet. Now I am trying to automate ...
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54 views

Custom camera driver

Is it possible to write a driver, say for a OV camera, based on the existing drivers at the RPI git repo? As is I understand, with a datasheet for a sensor it should be possible to write a similar ...
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60 views

SPH0645LM4H Adafruit I2S MEMS Microphone Kernel Error

I'm trying to configure the i2s kernel following this website: https://learn.adafruit.com/adafruit-i2s-mems-microphone-breakout/raspberry-pi-wiring-and-test but when I run the following code rpi-...
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27 views

Creating device driver which feeds GPS Co-ordinates from phone to raspberry pi

I don't have GPS module, so I was thinking whether I can feed GPS coordinates from my android/ios phone to raspberry pi over wireless protocol like bluetooth/TCPIP. Can I create a virtual device ...
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2answers
33 views

How do I identify the boot time in the logs?

Sometimes when my headless Pi Zero W hangs or goes offline without coming back, I hard reset it by disconnecting the power cable and reconnecting it. I'm trying to look for clues in /var/log/syslog ...
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1answer
106 views

Upgrading the kernel fails

I currently have kernel version: 4.14.79-v7+ (and I am using Raspbian Stretch) pi@pi:~ $ uname -a Linux pi 4.14.79-v7+ #1159 SMP Sun Nov 4 17:50:20 GMT 2018 armv7l GNU/Linux When I try to update and ...
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27 views

Kernel error : [drm] Resetting GPU

I am using an app which is using the vc4-drivers. Sometimes videos freeze for an instant, and I see a kernel message saying : [drm] Resetting GPU After that, some font are no more displayed but the ...
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71 views

End kernel panic problem

I'm a newbie, trying to connect a gps to my raspberry pi 3 bit. After rebooting I can't get any further, and receive the message End Kernel panic - not syncing: VFS: Unable to mount roof fs on ...
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1answer
26 views

custom kernel fails to boot - 'task init:1 blocked for more than 120 seconds'

I'm trying to build a custom kernel for my 3B+ (following this guide: https://www.raspberrypi.org/documentation/linux/kernel/building.md). It seems to boot without any error messages until it ...
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1answer
27 views

Building an old kernel is not possible because the arch/arm/boot/dts/overlays/ directory does not exist

I've been trying to build a kernel from the 4.14.85 version. I followed the instructions from the official documentation but instead of using the latest version you can find in the repository I ...
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2answers
229 views

How to find a specific kernel version in the Github repository?

I'm trying to get the Linux 4.14.85 kernel, for a problem I've posted before, related to Xenomai. I see here that there is a branch for 4.14.y, but there are no tags to find which commit corresponds ...
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1answer
124 views

raspi-config is not working after installing Xenomai on Raspberry Pi 3

I followed the instructions given here to install Xenomai on a Raspberry Pi 3. After installing the kernel (now the RPi uses the kernel-xenomai.img during boot) I couldn't access my network, neither ...
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22 views

Sd card gets corrupted on some monitors?

When connected to Monitor DELL e2218hn, SD card with NOOBS installed is getting corrupted within 2-3 hours of use. This is not the case with other monitors as it works really smooth. ISSUE: When Pi ...
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250 views

Can't build DKMS kernel module

I'm on Raspian Stretch and an RPi2. I'm trying to install xtables-addons-dkms. This was the output of apt-get on my first attempt: Setting up xtables-addons-dkms (2.12-0.1) ... Loading new xtables-...
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1answer
170 views

Patching and Compiling Kernel 4.14.97-v7+ with Realtime Preemption

I need to patch and compile (not cross-compiling) the Kernel 4.14.97-v7+ (Raspbian Stretch) to support realtime operations. However, I did not find the corresponding patch. The folder https://mirrors....
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0answers
100 views

How can I install the latest kernel from kernel.org to Arch Linux ARM for Raspberry Pi 3 model B?

I am using Arch Linux on Raspberry Pi 3 model B. I want to install a newer kernel (currently I have 4.14.94-1-ARCH kernel installed) I have downloaded and compiled the mainline kernel 5.0-rc5, which ...
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1answer
106 views

Raspbian compile single kernel module gfs2

I'm trying my best to get GFS2 mounted on top of a dual-primary DRDB /dev/drdb0 volume on Raspbian, but I'm hitting an issue. The DRBD volume has a working stonith/fencing cluster setup using ...
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iptables doesn't recognise REDIRECT as target

Trying to redirect traffic using iptables v1.6 and the following line: iptables -t nat -A PREROUTING -p udp --dport 67 -j REDIRECT --to-port 6767 which results in the following output: iptables: ...
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1answer
156 views

How do I add an i2c device to the device tree?

I am trying to add an mpu 9250 to the device tree of my RPi 3 A+ so that my custom driver's probe function will be called. I have followed this documentation about the Raspberry Pi device tree and ...
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160 views

Direct memory access to Cypress CYW43455 wireless LAN chip

Where can I find the direct memory addresses or GPIO pinouts for directly controlling the Cypress CYW43455 Wi-Fi chip on the Raspberry Pi Zero W from a custom unikernel, or a modified Raspbian? My ...
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1answer
80 views

Compiling modules for cross-compiled arm64 kernel fails with Syntax error

I successfully cross-compiled the current Raspi Kernel on my 64-bit machine to the target architecture arm64. I went through all the necessary steps for inserting the newly built kernel into my Dietpi ...
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3answers
215 views

Where does the Raspberry Pi Ethernet MAC get generated?

I read somewhere (in a few places, actually, can't seem to find the references to it now that I want them) that Raspbian on the Raspberry Pi generates the MAC address for the Ethernet interface based ...
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1answer
43 views

Parallel compilation linux real time kernel

Within the framework of a lab I had to compile a kernel using several commands such as: make zImage j-8 make modules j-8 make dtbs j-8 j-8 means I used parallel compilation but I am asked this ...
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1answer
265 views

Raspberry Pi Zero as webcam

I read some case, like using dwc2 and g_webcam in /boot/config and cmdline. but hard to understand and doesn't work. and can't find a tutorial, there are some tutorials only about serial and ethernet. ...
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2answers
219 views

raspbian stretch overrides cmdline.txt kernel.hostname parameter

i'm building an embedded prototyp with a raspberry pi 3b+ and its booting via pxe from the network read only. Multiple devices share the same root file system and just the boot folders are customized ...
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1answer
151 views

Kernel panic on shutdown/restart when relay board connected

I have a 3B+ with an added relay board. It's running Rasbian Stretch Lite (Linux blinky-stockholm 4.14.69-v7+ #1141 SMP Mon Sep 10 15:26:29 BST 2018 armv7l GNU/Linux) It seems like, if the relay-...
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2answers
146 views

vcgencmd in buildroot

I am using buildroot to create a custom os for my raspberry pi. I would like to use the vcgencmd command, but I am unable to find the package that includes these tools. I have tried searching the ...
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51 views

Clearing edge detect registers (GPEDS0/GPEDS1) crashes Raspbian Stretch

I've been working on a PHP library for Raspberry Pi for a few years now, and since (not sure specifically which) a version of Raspbian Stretch, the Pi becomes completely unresponsive when clearing the ...
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1answer
605 views

dmi: Firmware registration failed

I have installed Gentoo kernel 4.14.y from https://github.com/raspberrypi/linux. dmesg shows the following errors ... ... [ 0.182547] dmi: Firmware registration failed. ... ... [ 2.224843] mmc1:...
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324 views

Why doesn't extract-vmlinux work with Raspbian's /boot/kernel*.img?

To monitor if a reboot is necessary, I wanted to compare the version of /boot/kernel*img against the version of the running kernel. To get the kernel version of a compressed linux kernel image (...
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How do I interface with the “cprman” clock manager from another kernel module?

It's relatively simple to control the clock manager registers. I've found a set of values, and have C code that writes the desired values to the clock manager registers. This works well; that part ...
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1answer
54 views

Execution interruption while holding a kernel spin lock

I want to toggle an GPIO pin with a certain accuracy. (i.e. latency about 1 us). I have a Raspberry Pi 3 model. Therefore I wrote a simple test kernel module. The toggling loop does basically this: ...
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89 views

Kernel module can't be loaded - “invalid module format”

Headline: I've cross-compiled a kernel module for the Raspberry Pi, but on attempting to load it, I get the following error: insmod: ERROR: could not insert module testmod.ko: Invalid module format ...
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0answers
72 views

Kernel panic, real time clock (possibly), UPS Pico

Have a fresh install of KivyPie, which is some months old, with updates (have done apt update/upgrade). It crashes: and the reason seems to be these two lines enable_uart=1 dtoverlay=i2c-rtc,ds1307 ...
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3answers
89 views

Using special pins as gpio

I would like to use I2C and SPI pins as a gpio on my raspberry pi zero w. To be more clear, BCM 3-5-7-11-13-14 pins on the link [1]. I want to disable I2C1, GPCLK0, SPI0, UART, PWM0. Is it possible ...
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1answer
176 views

Missing cpu.cfs_period_us cgroup subsystem in Raspbian Stretch on Raspberry Pi Zero

I'm dabbling about with cgroups on my Raspberry Pi Zero using the latest version of Raspbian Stretch and I was surprised to see only the following cpu cgroup subsystems available: cgroup....
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1answer
313 views

Cross Compiling ARM Kernel on 64bit machine

I've been trying to cross compile a kernel for my Pi 1 on my 64bit Desktop, following this guide: https://www.raspberrypi.org/documentation/linux/kernel/building.md At this command (in the last ...
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1answer
144 views

Can I modify an RPi2 image to boot on an RPi3 B+?

I have a Raspberry Pi 3 B+, and none of the operating systems that usually work on the RPi 3 will boot. I've done a small bit of research, and I think this has something to do with an outdated ...
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0answers
305 views

Kernel panic - SMP: failed to stop secondary CPUs

I installed Raspbian 9 Stretch on my Raspberry Pi 2B board, I followed instructions at link https://robpol86.com/raspberry_pi_luks.html and randomly I get kernel panic message that ends: CPU2: ...
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1answer
27 views

wifi - WiFi sometimes does not work

When I powered the Raspberry Pi 3B on (I use Gentoo), WiFi was working. After reboot, it stopped working, both ip link list and ifconfig commands do not list it (they do if WiFi is working). I am ...
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3answers
85 views

RPi 3 kernel without VFAT support

I am building a very compact Linux kernel for my RPi 3. I have stripped a lot of features from the kernel. The current kernel size is around 4 MB. Currently I only have ext4 and vfat FS enabled. I ...
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0answers
109 views

ftrace + addr2line

I want to get kernel source code file name and line number of a kernel function from the function address that ftrace outputted on Raspberry Pi 3. I tried addr2line -e /boot/kernel8.img [function ...
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1answer
46 views

latest raspbian kernel update broke bash

I just updated by raspbian box (stretch, upgraded raspbian-kernel, using it as console only) and somehow broke bash. Every time I try to log in (either by ssh or locally) I get the following error: ...
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0answers
180 views

pyusb: scanner insufficient permissions

UPDATE: I added a symbolic link to my .rules file and it is being created every time I unplug/plug the scanner. I believe my issue is more of a permissions issue with my Python code and more ...
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0answers
246 views

How do I build a custom RPi kernel DEB package?

I've got a couple of patches to the kernel that I want to apply and use in Raspbian. If I follow the Kernel building guide, I can apply the patch and get my kernel image and modules working just fine -...
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3answers
2k views

Linux modules mismatch version

I have a very unusual condition, perhaps a partial update or unknown condition. #>uname -a Linux sip02 4.14.30-v7+ #1102 SMP Mon Mar 26 16:45:49 BST 2018 armv7l GNU/Linux #>uname -r 4.14.30-v7+...