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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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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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23 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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90 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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Raspberry Pi Kernel Panic!

friends. I got a new raspberry Pi Model B. I downloaded NOOBS from the website and I put it onto my SD card. Then I successfully installed Raspbian! My Raspberry Pi worked well for three days, but ...
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52 views

Updating Linux kernel on Raspberry Pi 3

So I have Ubuntu 18.04 on a Raspberry Pi 3 right now, and after installing linux-raspi2 metapackage, I got this error: ln: failed to create symbolic link '/boot/dtb-4.15.0-1026-raspi2': Operation ...
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30 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
62 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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21 views

What to use as device path for sysfs binding ttyS0 to custom kernel module?

I'm currently trying to bind a custom kernel module to ttyS0 of my Raspberry Pi Zero WH. With raspi-config I set the Interface Options for Serial to The serial login shell is disabled The serial ...
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55 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
55 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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115 views

Kali ARM image for the Raspberry Pi (2018.3) - kernel mismatch?

I recently downloaded the latest(2018.3) Kali ARM image for the Raspberry Pi from https://www.offensive-security.com/kali-linux-arm-images/ but I can't get it to recognize the built-in WiFi interface ...
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2answers
55 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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36 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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66 views

Using Raspberry pi as USB bridge

I wanted to use my raspberry pi as USB bridge between multiple devices. We can assume that I want to connect my iPad which has POS software on it to my thermal printer. Most of star or Epson thermal ...
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1answer
308 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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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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19 views

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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87 views

Setup 2 USB gadget interfaces with RPi 0

I am having a problem setting up raspberry pi 0 using kernel gadget API as 2 interfaces. I need to have a hid interface and audio interface. I am able to do that using gadget/functions/uac2.usb0 and ...
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1answer
41 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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32 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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43 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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47 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
71 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
120 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
54 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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226 views

Kernel Bug with Compute module 3L

I am using a raspberry cM3L and a carrier PCB to record stereo video throughout the day and the device reboots itself at midnight everyday. About every 3 weeks the stereo recording fails and I get the ...
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176 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
21 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
45 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
53 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
31 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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107 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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173 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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1answer
662 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+...
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1answer
247 views

USB/Bridge using MAX3421

Please, could someone help me, I am trying to use the module (max3421-hcb) with the raspberry pi 3, but I really don't know how to load this module, with the parameters, like wich GPIO will act as INT ...
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40 views

Kernel Parameters in AArch64

My Raspberry Pi 3B runs fine with the standard installation of ArchLinuxARM-rpi-3-latest.tar.gz. However I cannot set kernel parameters anywhere for a custom TFT. Formerly there was a file cmdline.txt,...
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36 views

Kernel Panic : VFS :Unable to mount root fs on unknown-block [duplicate]

I was having an issue with my Pi, and ended up having to refresh my SD card with a new copy of Raspbian. I followed the links and instructions on the Raspberry Pi site about cleaning the SD card. I ...
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1answer
410 views

Header files not being found (sys/stat.h)

I am trying to compile a device driver to control some LEDs connected via GPIO pins. First, I got errors that /lib/modules/4.14.31-v7+/build was not found, so I ran sudo apt-get install raspberrypi-...
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829 views

Pi 3B+ jack audio inputs

Related: Raspberry Pi 3 audio input? I need to be able to input several jack microphones (minimum 2, more could prove useful) to my raspberry, to do some audio processing (between all inputs), and ...
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1answer
3k views

boot hang on random: crng init dome

I have kernel 4.9.80 (arm64) installed on a Debian stable system. This is on a RPI 3b. When the kernel gets to the line random: crng init done, it stops and never continues. I have read other articles ...
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1answer
3k views

Kernel panic-not syncing: VFS: unable to mount root fs on unknown- block(179,6) running Raspbian NOT on top of NOOBS

I tried many fixes, but most of them are for NOOBS Raspbian installations, not for a clan Raspbian installation. I got the following Kernel Panic error: Kernel panic-not syncing: VFS: unable to ...
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1answer
81 views

Raspbian Kernel Cross Compiling Peripherals not working

I am having trouble compiling the Raspbian kernel from source. I used the instructions here: https://www.raspberrypi.org/documentation/linux/kernel/building.md. I am cross compiling on Ubuntu 16.04 ...
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1answer
385 views

Problems with compiling drivers for rtl8192cu

I'm trying to use realtek 8188cu module in concurrent mode(both station and AP mode simultaneously). I downloaded the driver source files from here: https://github.com/raspberrypi/linux/tree/...
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60 views

Optimizing linux filesystem and SD card for continuous video recording using Gstreamer

We are using raspberry pi3 and using omxh264enc with v4l2src fetching raw YUV 4:2:2 frames and encoding it to h264. use case: We have a write intensive gstreamer pipeline with two splitmux pipelines, ...
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2answers
1k views

Continuesly monitor GPIO input change/events in Bash

On a Raspberry Pi you can set the GPIO pins as an output or an input. An output or an input can be either high or low. For example, to monitor the input state (high or low) of GPIO pin 26 you can ...
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2answers
85 views

Cron and atd jobs cant see manually mounted file systems (mounted while on ssh) [closed]

I recently upgraded to debian [/raspbian] buster. Ever since then, cron jobs creating directories using mkdir -p <directory name> will create the directory on the root file system / device ...
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1answer
2k views

What repository to add for apt to find raspberrypi-kernel?

In the default Raspbian image I find *raspberrypi* kernel, bootloader, firmware etc. Using a bootstraped Installation I don't find them but using the same entries in /etc/apt/sources.list. In ...
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1answer
816 views

Trying to apply real time patch to kernel 4.9.76

Raspberry Pi 3 model B OS: Raspbian 9.3 stretch Kernel: armv7l Linux 4.9.76-v7+ CPU: ARMv7 rev 4 (v7l) @ 1.2GHz RAM: 1GB I'm trying to apply the real-time patch (it's highly desirable for my ...
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1answer
650 views

dtoverlay=gpio-poweroff not working on raspberry pi 3 B

Problem: I have a Raspi 3B rev: a02082 (Q1 2016 3 Model B 1.2 1 GB (Mfg by Sony)) running raspbian jessie kernel 4.9.35-v7 I want to signal to a power management circuit that filesystems ...
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203 views

/boot/upgrade not found on Ubuntu 16.10 with Berryboot

Hi! I am using Berryboot on my Raspberry PI 3 to boot between Raspbian, OPENElec, RetroPie & Ubuntu Server 16.10, Everything works smoothly except for one thing; When using the Apt-get command ...