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

learn more… | top users | synonyms

4
votes
1answer
2k views

Setting up HDMI output from Linux console

I am currently running Debian Wheezy on a HP Microserver N54L with an AMD Radeon 5450 video card. I would like to be able to play audio from the console through the HDMI port of my video card and ...
4
votes
1answer
152 views

what is the linux boot param “memmap” equivalent in freebsd

In linux kernel, there is an option to reserve a portion of system ram i.e memmap=512M$2G (boot param) Here 512M starting from 2G would be reserved and not available to OS What is the equivalent in ...
4
votes
1answer
392 views

Using a custom name for root device in GRUB

I'm working on old distro ( slackware 8.1 ) using a kernel 2.4.37.9 and I have the following problem. I want to use a custom name for boot device, say for example /dev/root1, which can replace the ...
4
votes
1answer
80 views

Timescales of any task in linux kernel?

I am studying how Linux kernel works and getting interested in the timescale of anything that happens in the kernel. Of course I know it depends on the HW, but would like to get an example. For ...
3
votes
1answer
147 views

Building a minimal linux

I have been following A Minimal Linux System from Scratch in order to build a Linux with a small footprint (10MB or less). I'm fairly certain that there were no errors up until the last point, where ...
3
votes
1answer
176 views

Output shutdown messages to multiple consoles

I have configured my system to direct console output on boot to serial and vga using kernel parameters. Serial is the last argument in the kernel parameters and will be the default used for ...
3
votes
1answer
710 views

What happened to `vga=ask` in newer kernels?

I used to activate framebuffer mode in the "older" kernels with vga=ask, and later setting it to a value, once I've figured out which one works best for me. Now, this option seems to be gone, the ...
3
votes
1answer
151 views

Server pinning one core

I'm working on a server using Vert.x in Java and I'm noticing some performance problems when running on a dedicated server running Ubuntu 12.04. The server picks up the incoming HTTP requests, does ...
0
votes
0answers
103 views

Linux Kernel Panic and Problem with boot

I have installed CentOS 6.4 on VmWare Workstation (Win 8 as Host OS). I worked with it for several days, but suddenly when I rebooted it, it did not boot properly and on stopped with this error : ...
0
votes
0answers
105 views

Syslog message “rt_bind_peer(0) @ffffffffa0283f57”, twice in every second

My /var/log/syslog on a Debian server is flooded with lines similar to: Dec 23 16:05:40 server1 kernel: [ 686.957585] rt_bind_peer(0) @ffffffffa0283f57 These messages occur up to twice a second ...
0
votes
0answers
119 views

different ways how Linux TCP/IP stack terminates connection

I have a Linux machine which connects to SSH server with SSH client(OpenSSH_4.1p1). SSH client machine has IP address 10.10.11.1 and SSH server has IP address 10.10.10.1. SSH client has kernel version ...
0
votes
0answers
90 views

linux vlan bridge feature backport to 2.6 kernels

The VLAN-aware bridge was introduced to the Linux mainline on the 3.x kernels, according to this article on lwn: VLAN filtering/VLAN aware bridge Has this feature been backported to the 2.x kernels ...
0
votes
0answers
53 views

3.10.17 Kernel i2c buses missing on embeded system

On my ARM embeded system I have 4 i2c buses and only one shows up in /dev and in /sys/device/... folders. Other 3 i2c buses are not loaded. There is also no warning message inside dmesg, but there is ...
0
votes
0answers
62 views

Suspend Crash in android 4.4

During suspend clocks are not turning off, meanwhile when we resume clocks are not getting turning on. I am getting crash like <4>[ 216.945252] WARNING: at ...
0
votes
0answers
116 views

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 ...
0
votes
0answers
226 views

loading ath9k_htc kernel driver fails

could someone please point me in the right direction to get my external wireless stick (TL-WN722N) working on my Xperia Neo (haida) smartphone? So far I've done the following: I downloaded ...
0
votes
0answers
94 views

Debian Squeeze: TCP/ICMP stops working suddenly (R8169 Driver)

we suddenly see our NETWORKING stops (TCP/UDP/ICMP) in our client system. tcp: We tried reaching our server every 5 seconds.But , there was no connection establishment TCPDUMP REF: ...
0
votes
0answers
95 views

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 ...
0
votes
0answers
64 views

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 ...
0
votes
0answers
613 views

FreeBSD boot problem, UEFI or LEGACY and GPT disk

i have a computer based on GPT disks with triple boot. For the moment i have two OSes working on my computer (OSX and Windows). I want to make a FreeBSD installation, he work perfectly when i boot on ...
0
votes
0answers
70 views

RHEL 6.5 erroneously marking Fusion-io RAID1 card as failed

I am getting the following error every hour for a Fusion-io ioscale2 RAID1 (mirror) configuration. However, the logical volume is mounted and accessible. I do not see similar error in the ...
0
votes
0answers
71 views

How do I set kernel-ml default in CentOS?

I have installed kernel-ml package from http://elrepo.org/tiki/kernel-ml Now I have both the original CentOS kernel and kernel-ml. How do I set kernel-ml as default on boot? Thank you!
0
votes
0answers
143 views

Surface Pro Compatible Wireless cards and drivers

In reference to this post: Surface Pro Wifi Issues on Mint KDE 17 there doesn't seem to be any solution to fixing the wifi issues on the Surface Pro when running Linux. The Marvell card doesn't even ...
0
votes
0answers
84 views

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 ...
0
votes
0answers
97 views

How to recompile official OpenSUSE kernel & initrd?

But it is not okay. I want all of the suse patches applied, I want an official initrd to be generated, and I want to make rpms from all of them. So, I want to recompile the kernel just as the SuSE ...
0
votes
0answers
106 views

Fedora 20 won't startup after shutdown during kernel update

I had a few bugs in my System(System Settings not opening and Firefox not starting) and I thought a kernel update(via yum) could do it some good. During that update, I suddenly got logged out as if ...
0
votes
0answers
456 views

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 ...
0
votes
0answers
33 views

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 ...
0
votes
0answers
26 views

Patching and Compiling my Kernel

So I have an issue with my USB 2.0 ports and I believe I have found a solution for it, which is in the below link. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1210858/comments/32 I have ...
0
votes
0answers
218 views

USB Keyboard Hotplug Module not Working

The following module could be compiled and loaded without any error: #include <linux/module.h> #include <linux/kernel.h> #include <linux/usb.h> #include <linux/usb/input.h> ...
0
votes
0answers
57 views

how to limit dma address to specific range in linux kernel?

I want to limit the dma address the device can access to 0x0100_0000~0x03ff_ffff. But I don't know how to set the dma_mask and coherent_dma_mask. It's easy to set the "dma mask" for a range start ...
0
votes
0answers
96 views

Noob Kernel Image Question

I'm playing about with CM-FX6 , an iMX6 based SOC. The chip comes with the following: http://www.compulab.co.il/workspace/mediawiki/index.php5/CM-FX6:_Linux:_Kernel **images** uImage-cm-fx6 - ready ...
0
votes
0answers
44 views

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. ...
0
votes
0answers
25 views

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 ...
0
votes
0answers
281 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 ...
0
votes
0answers
128 views

How to boot on a ramdisk?

I'm working on a linux embedded for a custom board with a ARM9 processor. My kernel version is : 2.6.33 I'm trying to boot on a ramdisk, kernel correctly mount the file system but failed to execute ...
0
votes
0answers
37 views

Module load map

How can I obtain a module load map? I've tried with the -m flag in insmod but it seems that since 2.6 there is no support for it. Thanks
0
votes
0answers
720 views

nfsd fails to start: modprobe: FATAL: Could not load /lib/modules/2.6.18-238.1.1.el5/modules.dep: No such file or directory

Before asking, here are some system specs: [root@SERVER ~]# cat /etc/*release **##############CARS build log for cars20-rhel-x86_64############## Date: Mon Feb 28 20:06:05 PST 2011 Builder: ...
0
votes
0answers
159 views

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 ...
0
votes
0answers
71 views

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 ...
0
votes
0answers
188 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 ...
0
votes
0answers
113 views

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 ...
0
votes
0answers
56 views

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 ...
0
votes
0answers
361 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 ...
0
votes
0answers
206 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 ...
0
votes
0answers
189 views

pptp differs between 3.7 and 3.8 linux kernel milestone with 3.2.0-4 milestone

Unfortunately, current kernel of debian has problem with my hardware: 3.2.0-4-686-pae , and when i compile one of 3.7.x milestone or 3.8.1 itself , my problem is solved. But my problem with new ...
0
votes
0answers
694 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. ...
0
votes
0answers
312 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] ...
0
votes
0answers
151 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 ...
-1
votes
0answers
16 views

Which module utilities are the conf files in /etc/modprobe.d consulted for?

Are the conf files in /etc/modprobe.d consulted only for modprobe command or are they consulted for other module utility commands such as insmdod, rmmod, depmod etc as well? I found it mentioned in a ...