The kernel manages drivers, file systems, inter-process communication, and interrupts.

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Kernel throwing up all kinds of errors over night

I am developing a system that uses OpenCV with Python to access the csi camera, and PyGame for the GUI. Due to the nature of the system (security program) it needs to be left unattended pretty much ...
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23 views

Problem installing usbip on Raspbian

I am trying to set up USB/IP to share a USB device I have connected to my Pi model B. Here are the steps I have completed. I have installed the usbip package and cross-compiled a new kernel ...
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39 views

Specify interrupt in devicetree overlay

I have created a devicetree overlay to add an MRF24J40 transceiver to Raspberry Pi. The interface of the transceiver is SPI and an interrupt request. After some trouble the device finally appears in ...
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10 views

Using kernel debug symbols on Raspberry pi

I see that I can install packages that contain the kernel debug symbols in Ubuntu as shown here. Is it possible to do the same for Raspberry pi? I'd really like to have kernel symbols for the raspbian ...
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2answers
254 views

Emulating raspbian with QEMU

I'm trying to emulate raspbian on QEMU and there're plenty of guides available on internet. However, every guide points to download qemu-linux kernel from link ...
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1answer
21 views

Time between power on and kernel starting

On my RPi2, I have measured exactly 5 seconds between : "I plug the power cord" and "Kernel starting time 0.00s", as displayed on the top left here: Is there a way to optimize this ...
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1answer
35 views

Trick kernel into having a connected keyboard

I have a Raspberry Pi B running Raspbian. I'm using it to create this for my little brother. I'm using Adafruit's Retrogame code (found here) to receive GPIO inputs and convert them into keyboard ...
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57 views

GPIO.cleanup() on RPi2

To make a long story short I am trying to read frequency on the RPi2's GPIO pins. The goal eventually would be to use this frequency signal to control a PyGame platformer that I have created. However ...
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1answer
42 views

Raspberry Pi kernel image installation on new SD Card (no pre installed Raspbian or NOOBS in it - it's free with no partions)

I have been working on kernel compilation of Raspberry Pi on Ubuntu using a cross compiler. I have compiled the kernel, and I got the image file generated ...
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44 views

Kernel panic not syncing with keyboard plugged in [closed]

My Raspberry Pi won't boot with a keyboard plugged in. It is a wireless Logitech two-in-one keyboard, and it says: end Kernel panic - not syncing: Fatal exception in interrupt. How can I fix ...
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1answer
81 views

missing crypto kernel module on Raspberry Pi 2

I'm trying to use dm-crypt on my Raspberry Pi 2 with Raspbian (jessie) to open a trueCrypt volume, but i get Required kernel crypto interface not available. Ensure you have algif_skcipher kernel ...
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71 views

Invalid module format error on Raspberry. Kernel 3.10.25+

I am trying to install a module on my Raspberry Pi B+ running with Raspbian. To know the version of the Kernel I run the command uname -a and i got this: Linux raspberrypi 3.10.25+ #622 PREEMPT Fri ...
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114 views

RPi crashes randomly after 1 to 2 days

I don't know what causes it so I write down what I found out so far, hoping it matters: I have multiple rpis installed in my house, all running perfectly, except this one. I exchanged that rpi ...
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1answer
89 views

How to add usb wifi adapter support to android build?

I have kernel version : 2.6.38.8 #9, the output for lsusb is Bus 001 Device 003: ID 0bda:8179. Can anyone help to find correct drivers for this chipset and how to add drivers to kernel ?
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220 views

“Panic:VFS: Unable to mount root fs on unknown-block(179,2)”

When booting my Pi, I get an error that states: "Panic:VFS: Unable to mount root fs on unknown-block(179,2). It's rather annoying, and I've tried lots of various things, I've googled and searched, but ...
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62 views

Boot error (PREEMPT ARM) and screen freeze

I had used and tested my RPi B+ almost 2 months ago, with different TVs (via HDMI and AV), and it worked without any problem. Today, I wanted to test my RPi B+ again (after 2 months of not using it) ...
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2answers
73 views

Kernel Configuration for CAN-Bus

I'm trying to configure my can-bus module. I'm following these steps . My branch is 3.18.y-rebase (from github) When I came to device drivers->spi support step I couldn't see BCM2798 SPI controller ...
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247 views

How to upgrade my Pi to a new major kernel version?

I am considering upgrading the kernel of my Raspberry Pi router to 3.19. But how can I do this? I have found an out-of-tree nl80211-compatible driver for rtl8188cus that supports hostapd and acs, but ...
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37 views

How to enable ptrace of existing non-child process?

Ubuntu and other systems have added the sysctl in /proc/sys/kernel/yama/ptrace_scope since ~2010; this filesystem location does not exist on my RaspBMC Pi with kernel 3.10.17 (no yama/ directory ...
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98 views

How do I install the matching kernel sources for raspbian?

After spending a lot of time with the presumably correct kernel source for my RPi in order to compile a driver (kernel sources for the driver module and the built kernel need to match precisely, ...
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80 views

SPI problem when install CAN controller driver

I updated my raspi to 3.18.7+ last days and i also need new driver for my modules. I was waiting for PICAN board driver for pi and yesterday i uploaded it. Before uploaded; ls -al /dev/spi* ...
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152 views

Controlling kernel interface 4DPi-32 display

I bought a a SPI controlled display 4DPi-32 [1] and compiled a kernel patched with the driver source [2] provided by the vendor (because the provided deb does not work with RPi2). I had to adapt the ...
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1answer
41 views

infinite loop while building script for kernel

I have replace 3.18 kernel with 3.10 kernel for some kernel module checking on raspbian. Now when I tried to build that module I got error for kernel script (genkmsys, fixdep etc etc). So, I tried ...
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1answer
159 views

How to U-Boot for Arch linux over NAS?

I want to use u-boot my Arch linux including the kernel from the NAS via NFS (or TFTP if it requires). I have installed Arch before and I understand kernel.img, I have read this link about U-Boot ...
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196 views

rpi 2: Unable to change irq affinity

I am trying to optimise getting GPIO interrupts into userspace. On the single core rpi 1 I couldn't get rid of quite some timing jitter, which makes sense as there's a lot of stuff going on on the ...
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1answer
2k views

What is the default cmdline.txt?

My Raspbian Pi crashes to a Kernel panic when I start it up, and it suggested somewhere that an invalid cmdline.txt can cause this. What is in the cmdline.txt by default?
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216 views

Raspberry Pi 1.2 GHz kernel panic

When I overclock my Raspberry Pi B+ to 1200 MHz, it spits out a nasty kernel panic, even though it is overvolted and cooled sufficiently. However, on my Raspberry Pi Model B, I have gone past 1.3 GHz. ...
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100 views

Keyboard and Wi-Fi dongle don't work after updating kernel

I have installed Raspbian on my Paspberry Pi and was experimenting with developing for it. I have followed this tutorial and cloned the kernel on an Ubuntu VM to cross compile it with raspberry tools. ...
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324 views

USB Issues with recent kernel build

I am trying to roll my own image for the raspberry Pi, I am using a B+ model Pi. What I want to do is build my own kernel and for now have it load busybox or something similar, but I seem to be ...
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1answer
319 views

Raspberry Pi kernel compilation adding Galaxy touchscreen drivers

I am trying to add the eGalaxy touchscreen drivers to raspbian os . Following this link .. http://simonmcc.blogspot.in/2013/08/raspberry-pi-rpi-kernel-build-for.html?showComment=1421908155346 But ...
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311 views

Why I cannot read the temperature/humidity sensor sht20?

I use a temperature and humidity sensor sht20. According to this link: http://www.sensirion.com/en/products/humidity-temperature/humidity-temperature-sensor-sht2x/ It is compatible with sht21, which ...
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196 views

Kernel not updating on Raspbian under QEMU

I'm trying to update my kernel to the latest version. apt is updated and upgraded, and rpi-update finishes without error. However when I reboot, I'm still running the old kernel. Any ideas? $ uname ...
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131 views

Can I get better performance on Raspbian if I blacklist a lot of kernel modules in raspi-blacklist.conf?

I have a Raspberry Pi that is being used only for displaying a single webpage. I have the memory split set at 64M for the GPU. The display does not require sound, web-video, usb-devices, user-input. ...
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385 views

Do we need to put i2c code into kernel?

I see codes to make i2c device (e.g. i2c sensors) work in user space, just need kernel to support /dev/i2c-0 or /dev/i2c-1. But whether do we need to put the codes into Linux kernel? For example, if ...
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381 views

insmod segmentation fault error each time I insert a basic module

I'm trying to build some kernel modules on RPI, the ismond work fine for some times, now the insmod command crash each time I try to insert a simple module. the kernel module compile without any error ...
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1answer
113 views

What is the right value of GPIO_BASE in Linux kernel for Pi?

According to "BCM2835 ARM Peripherals" page 90, the GPIO registers start from 0x 7E20 0000. While according to kernel file: arch/arm/mach-bcm2708/include/mach/platform.h, as below. #define ...
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66 views

Kernel Panic on Boot with GertDuino

When I boot my RPi with the GertDuino attached and the jumpers set to the Atmel 328 I get a kernel panic where it cant find the rootfs and drops me to a shell, "kdb >". When I place the jumpers set to ...
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3k views

Compile linux device driver in Raspbian

I have some problems with compiling & building a simple gpio driver that I wrote( after THIS documentation). I have a Raspberry Pi Model B+ ( not sure if it's relevant to the question) with a ...
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9 views

I am not able to boot with the latest kernel source ie 3.18.0 with the device tree enabled [duplicate]

I am not able to boot with the latest kernel source ie 3.18.0 with the device tree enabled. I am getting blank screen. I used the [b]latest tools and firmware[/b] to boot. downloaded the code from ...
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2answers
82 views

Is it possible to run only the kernel?

I would like to run some user space application, hence I would like to know whether the followings are possible: is it possible to run only the kernel without Debian? if yes, how can I compile and ...
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1answer
69 views

What is the significance of .y and .y-next in the Raspberry Pi kernel branch names?

The Raspberry Pi kernel repository has branch names that end in .y and .y-next? For example, rpi-3.17.y and rpi-3.13.y-next. What is the significant of the .y and .y-next?
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91 views

Systel level differences in making a GPIO high in Raspberry PI vs Beaglebone

I understand the Raspberry PI uses the previous Kernel and the Beaglebone Black uses the one after and both do a great job for different applications. I would like to know what is the difference in ...
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1answer
282 views

Xenomai to Raspberry

I want to get Xenomai working on my Raspberry. Unfortunately I am not very familiar with compiling kernels. I am using this documentation to get it work: ...
4
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2answers
761 views

Kernel .config necessary options

I'm interested in compiling a custom kernel for the pi. I have the source from the github archive, which includes a make target for a default configuration: make ARCH=arm bcmrpi_defconfig But (as ...
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125 views

Using I2S/PCM on the P5 header

I am trying to get audio capture through a custom codec board that is using I2S to communicate the audio data. I'm having trouble finding support for using I2S. There was a lead here although the ...
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179 views

Kernel compilation failed when enabled DEBUG

I am compiling a kernel for my raspberry pi (on the pi). I checked necessary configuration and enabled DEBUG_INFO=y and REDUCED_DEBUG=n. But when I issue the command make I get the following error: ...
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288 views

Does the kernel support a BMP180 BMP85 digital pressure sensor out of the box?

The kernel generates a virtual file with the values for the famous temperature sensor DS 18B20. Is there a plug and play kernel support for the I2C digital pressure sensors BMP180 and BMP85 too? ...
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2k views

Best approach for real time operating system on Raspberry Pi

I need to use Raspberry Pi with a real time operating system. Of course, I want the best solution. I've searched some options, including custom kernel compilation, ready to install RTOS. So, which ...
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693 views

eGalax Touchscreen support, without kernel recompile, raspbian OS

I have been using a custom compiled raspbian OS, with eGalax touchscreen support. The problem is every time there's some upgrade or a major version change in the OS or firmware, I have to recompile ...
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54 views

panic by alternating modprobe / rmmod

I had problems with fswebcam, which I use in a script to take periodically snapshots with my small Logitech webcam. Googling around I found out that in case of error you could issue the two commands ...