Everything about UNIX kernels: development, configuration, compilation, design, etc.

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CPU load and power management (frequency)

question background In my understanding the load value (shown e.g. by top) allows (together with the knowledge how many CPU cores the system has) a very quick assessment which share of the ...
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module prints to kernel log with delay

I've created a basic linux kernel module, which does the following: static __init int init(void) { printk(KERN_DEBUG "Banana"); return 0; } And of course: module_init(init); Strangely, I ...
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latest arch linux on beaglebone black

I have installed arch linux using what I assumed was the latest kernel at http://archlinuxarm.org/os/ArchLinuxARM-am33x-latest.tar.gz But this only installs 3.8.13 and I understand that there are ...
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Changing linux config from 32 bit to 64 bit loses RTC

I have a config from a 32-bit linux 3.12.18, and was trying to compile a 64 bit version with most settings like selected drivers etc. the same as in 32 bit version. For this I used make menuconfig ...
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How can I compile and run a program designed for an older kernel version (2.6) in a newer kernel (3.16)?

I'm trying to run a driver for a network card, but it only supports kernels up to 2.6.32. I need to be able to use this piece of hardware to connect to the Internet. The device I'm using is "VIA ...
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214 views

yum update returns kernel error

I want to install virtualbox in fedora20. I have followed the instruction here: http://www.if-not-true-then-false.com/2010/install-virtualbox-with-yum-on-fedora-centos-red-hat-rhel/ but when I ...
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541 views

IPTABLES comment: No chain/target/match by that name

Faced with error when adding new rule with 'comment': # iptables -I INPUT 1 --source 66.***.***.78 -j REJECT -m comment --comment "Some" iptables: No chain/target/match by that name. Without ...
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Best approach to adding a kernel driver

I have a task to complete. An LED must be controlled immediately after the kernel loads and into the launch of a Debian system. It also must be controlled in user land. I already have basic LED ...
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386 views

ZFS support for linux kernel versions 3.16

Attempting to boot Funtoo with a debian-sources-3.16.2-3 kernel, in a system where the root file-system lives in a zpool, drops off to the rescue shell after failing to import the pool properly. Does ...
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526 views

Mount JFFS2 FS in openwrt

I'm trying to mount 1[MB] of flash as JFFS2 FS in openwrt environment, using 128[MB] NAND flash (4 bit ECC). I'm using the following sequence - flash_eraseall -j dev/mtd6 mount -t jffs2 -o noatime /...
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yum install kernel-devel: “Nothing to do” [SOLVED]

I need the kernel-devel package to compile a program(How to check if USB WiFi-Adapter is not working or router is out of range?), but when I try to install it via yum, this is the only output: yum ...
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How to recover firmware on a embedded device with corrupted u-boot and kernel image? [closed]

My embedded device is not working after updating firmware. Thus I tried to update firmware using u-boot. I could successfully get u-boot console via serial connection, but updating firmware failed due ...
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third party linux auditing software

Linux has a audit system built-in in its kernel and a user space process called auditd reading the system calls intercepted by the kernel. Are there alternate solutions to the Linux Audit system ? I ...
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383 views

Debian stable: Only GNOME classic with custom 3.16

I compiled a custom 3.16.2 today, which works flawlessly except that GNOME only starts in classic mode. Maybe this is due to changes in the drm i915 driver, but how would I debug this? System is a ...
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LVM2 Mirror Support Missing from Kernel after System Migration

I had a system that was running on a small netbook that had LVM2 set up to group two external USB hard drives into a volume group, and to use that volume group to create a mirrored logical volume. ...
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Generate what a GRUB2 kernel line would look like

In GRUB 0.97 we were able to see what the kernel line/options would look like by just viewing /boot/grub/grub.conf. Now the only way I know how to check the next boot kernel options/kernel version ...
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458 views

Resume from Suspend/Hibernate issues

I have a peculiar problem while trying to resume from both suspend and hibernate. I believe the problem to be within the kernel itself since I have tried different distros (Ubuntu, Suse, Mageia) on ...
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SLES 10 SP4 - how to get specific kernel source?

I want to look at the kernel source for some specific kernel versions on SLES 10 SP4. I don't want to see just the Linux kernel source, but the one SLES is actually running. Suppose I wanted to get ...
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379 views

The meaning of Linux Kernel bug output

I have a quick, (maybe naive),question about Linux kernel's output. When I issue a command, the system (Ubuntu 12.04) freezes, the serial port output of this system is as follows: [ 373.805067] BUG: ...
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882 views

custom kernel and firmware loading

After I have compiled my kernel, and when I type make modules_install, not only are the modules copied into /lib/modules/ but also firmware is copied into /lib/firmware/. The following is the end of ...
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582 views

How are the different kernel naming schemes relate?

I am running Ubuntu 13.10 with the Kernel 3.8.0-030800-generic downloaded from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.8-raring/ When I want to run for example turbostat or cpupower commands,...
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161 views

Is there any alternative to genext2fs in RHEL?

I am tryting to make initrd file system following [this tutorial][1] My host system is RHEL 6 64 bit. I am unable to get the required command: genext2fs No rpm is available for it, neither ...
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561 views

How to verify that my uImage is good?

I had a zImage file and I used mkimage tool to convert it into a uImage format. When I am booting this file, it is not been found by u-boot: Wrong Image Format for bootm command ERROR: can't get ...
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413 views

How can I replace the default kernel with an earlier kernel?

I am working on petalinux, Linux for xilinx FPGAs. The source code is here This Linux is having 3.x kernel, and I have been asked to change the kernel to some earlier release version. What are the ...
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Problems configuring kernel

Trying to recompile my kernel and getting the following error to support Xen PCI Passthrough.It almost makes it through the whole build then flops out when building the image. dh_testdir ...
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591 views

NFS: failed to create MNT RPC client status = -101

I am trying for network file system (NFS) booting between two systems. I am using dhcp server to assign IP-address for client. And my kernel and root file system are present in server. My client is ...
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96 views

How to install kernel sources

I 'm running Angstrom distribution (console only) on BeagleBoard-xM. Image was build on Narcissus, with Bootloader Files (x-load/u-boot/scripts) added. I noticed that usr/src directory is empty. I ...
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243 views

Questions about behaviour of running LiveCD Linux after unmounting a CD-ROM

Could anyone explain what happens in system after unplugging CD-ROM during working with LiveCD session? Suppose that I'm using Ubuntu LiveCD and suddenly by accident the CD-ROM disconnect for a ...
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263 views

Card Reader UB6520 on Parabola GNU/Linux

I'm trying to make work the SD card reader UB6250 on Parabola GNU/Linux. Could you help me please? After inserting the SD card, I get the following dmesg: [65408.273667] usb 2-5: new high-speed USB ...
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101 views

Ubuntu Kernel Compilation?

I'm trying to compile and install kernel 3.13.1 on ubuntu 13.10 using following commands: sudo apt-get install gcc sudo apt-get install libncurses5-dev cd Downloads/ sudo tar -xvf linux-3.0.tar....
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Updating a driver quirk in kernel

Os : Debian 6 Kernel Version : 2.6.32 I have been recently working with Linux application and now we have some little hard-disk issues where my motherboard doesn't support AHCI through bios. On ...
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Fedora 14 root missing capability

I am trying to run a process that performs a clone() operation using a set of flags (CLONE_NEWIPC, CLONE_NEWNET, ...) that require CAP_SYS_ADMIN capability. This should not be a problem since I am ...
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523 views

Doubt when compiling USB/IP drivers

I need to install a USB 3G modem to a Windows virtual machine (running on OVM). The modem will be plugged on a Linux host. (Would Windows be easier?) I don't understand what the following README file ...
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auditctl reports “File system watches not supported” on a very old system

When I run auditctl -l I got: # auditctl -l No rules File system watches not supported And I've already have AUDITSYSCALL enable in kernel, # zgrep AUDIT /proc/config.gz CONFIG_AUDIT_ARCH=y ...
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Could the Kernel stack of a process be empty, when a process is swapped out to a disk?

I am just curious to know whether the Kernel stack could be empty when a process is swapped out to a disk or not?
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init 0 process is not starting

Yesterday I have encountered one problem, when I turn on my PC it took a long time to boot. After booting it reached to command line with <initramfs> (It is unknown to me what it is) I thought ...
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247 views

Linux server crash (kernel NULL pointer dereference + soft lockup - CPU#1 stuck)

I have a Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1 x86_64 GNU/Linux server that keeps crashing, usually once every 24-72 hours. I'm running lighttpd, mysql, haproxy and a couple of always-running ...
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Figure out which distro I'm using with Zsh script [duplicate]

I'm making a script that installs some basic needs of mine on my newly installed Linux. However depending on the Linux distro the contents and commands would be different. In Arch Linux I would use ...
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423 views

How to create a debian 3.x kernel rootfs on a 2.x host

I'm trying to build a rootfs for an embedded A10 board. This will be matched up against 3.0.62+ modules and a corresponding vmlinux image. I've been trying for a few days to get a rootfs set up for ...
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USB_HID is not working

How do I get a usb keyboard to work? I have already selected and compiled the USB HID transport layer and I don't know what else to do.
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Loading a custom library [duplicate]

Possible Duplicate: Entry point of linux kernel I'm compiling my own linux kernel and I was wondering how I could make the kernel load a library that I made when it first boots up.
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952 views

adding system calls to kernel without recompiling during implementation

Could anyone tell me if it is possible to add several system calls to the linux kernel (version 2.6.35) and not have to recompile the kernel each time I change one of their implementations (i.e. ...
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362 views

“TouchPad lost synchronization” errors in dmesg

My openSUSE 11.3 laptop is running slow. dmesg shows the following errors: [ 733.162161] psmouse.c: TouchPad at isa0060/serio4/input0 lost synchronization, throwing 5 bytes away. [ 774.230841] ...
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183 views

Make kernel detect garmin device

I'm trying to connect a usb garmin forerunner device to my system, but the usb device is not detected. I have loaded the following mods: garmin_gps 11544 0 usbserial 25449 ...
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What is kernel Space and User space. [duplicate]

what is Kernel space ? i want to understand it and same with User space and what is the diff between them
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Kernel modules for compiled kernel

I cannot find kernel-headers. For the first time I compiled and installed the latest kernel (4.0.3) on my Debian Wheezy, and now I am trying to install ndiswrapper using module assistant. For that, ...
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Error installing kernel on Centos (from source)

I am running GNU/Linux (Centos 6) on kernel 2.6.32-431.17.1.el6.x86_64. I am trying to update the kernel to 3.2.61. I performed the following steps inside the 3.2.61 folder structure: make ...
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Is the kernel version fixed within the life of a release/version of each Linux distribution?

I read the Table of versions of List of Ubuntu releases. I found that the kernel version for each release is fixed. E.g. the kernel is 2.6.24 for Ubuntu 8.04, 2.6.32 for 10.04, 3.2+ for 12.04, and 3....
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138 views

Common code for kernel and userspace [closed]

I'm working on a linux project. I want to have some code (to be specific, a struct) and a header file (my own implementation) common to both the kernel and the userspace. Can someone tell me how to ...
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Linking option while installing Linux [closed]

I have installed Linux kernel from source. The way I do this is that I first do make menuconfig and then make inside the root directory of the source code. As a result of this I get a an ...