The kernel of operating systems popularly known as Linux, or sometimes GNU/Linux.
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H264 support for webcam driver source in kernel?
I have a EVM board, which has camera connected over mipi bus,
Overall my EVM board will act as USB webcam gadget, I want my webcam board to support h264, as I was going through drivers/usb/gadget/...
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0answers
11 views
Kernel starts OK on POWER-ON but aborts on REBOOT
I have a banana-pi which runs sunxi-linux (kernel 4.2) and there is a strange problem.
When I connect the power plug, it boots up and everything is just fine.
If I run reboot command from it's ...
1
vote
1answer
27 views
Compiling different kernel version
Are there any rules about what versions of the kernel you can successfully compile and run against a particular OS software base?
That is, supposing I'm on Ubuntu 16.04, which includes some ...
0
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1answer
94 views
DKMS stuck while installing new kernel, what shall I do?
I am on Linux Mint 18.1 Cinnamon 64-bit.
DKMS seems to be stuck while installing new kernel for 30 minutes now, what shall I do?
Kill the DKMS process? And then run dpkg --configure -a?
Here is the ...
0
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0answers
24 views
Installing VirtualBox Guest Addition CentOs6.8
Similar problem has been encountered many time based on my research> But I cannot find a solution.
I am trying to install the VirtualBox Guest Addition (VBoxGuestAdditions_5.1.12.iso) on a CentOs6.8, ...
0
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0answers
23 views
Fuse file system with “default permission” option [on hold]
I am new to fuse. I have mounted fuse by the following command.
/mnt/fuse -o default_permissions -o allow_other -o nonempty -o hard_remove –d
Now If I login as "test" user and tried to create a file ...
0
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0answers
10 views
How to change Centos framebuffer resolution
I'm using Centos with a patched kernel by me that show a custom logo at boot stage. I'm using grub2 as well. If I select a patched kernel in grub the splash screen that I have set as logo in kernel ...
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0answers
10 views
Rotating X11 and window manager
I'm working with a 2.8 inch ili9341 tft display with my linux device.
I'm trying to rotate screen to landscape(320x240), I was able to rotate linux console, linux logo and psplash screen to 320x240 by ...
0
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1answer
11 views
What are the differences of editing UTS_RELEASE and EXTRAVERSION?
UTS_RELEASE is in include/generated/utsrelease.h
EXTRAVERSION is in makefile
For example my kernel has UTS_RELEASE "4.4.30-7+" and the EXTRAVERSION contains -7+
Both are affecting the result of ...
0
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0answers
7 views
add_key: Permission denied
I have generated on ubuntu with the kernel 4.4.0-57 a key with:
openssl req -new -nodes -utf8 -sha256 -days 36500 -batch -x509 -config x509.genkey -outform PEM -out kernel_key.pem -keyout kernel_key....
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0answers
18 views
tick_sched_timer very high number of wakeups in PowerTop
I have recently set up a Gentoo installation on my laptop, and PowerTop reports that tick_sched_timer is causing a lot of wakeups. It varies from 200 wakeups per second all the way up to 1000 or so. I ...
0
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0answers
22 views
Editing android kernel with desktop linux kernel knowledge [closed]
As I want to start desktop linux kernel programming in a hope to be able to use same for android too, I want to know if I can edit android linux kernel with my knowledge on desktop kernels ? My aim is ...
0
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0answers
10 views
Openwrt on Mikrotik SXT Lite2
Soldered wires to pcb UART points. Using a USB-UART adaptor.
Trying to boot Openwrt ramfs image via Bootp/tftp.
Router enters netboot mode an issues a DHCP request.
PC replies with IP, bootp ...
3
votes
0answers
32 views
Is it normal that a modalias matches various devices?
Recently another user asked why they were loading the fjes module. While I was trying to understand that question, I realized that Linux is also loading the same module for me.
Now, this is the ...
3
votes
1answer
41 views
Find out why linux kernel module was loaded
The debian backports 4.8 standard kernel loads the module fjes on my thinkpad T460s.
How can I find out why this module is loaded, i.e. which hardware triggers loading this module?
2
votes
0answers
30 views
Copy files from VCD without conversion to MPEG
I'm using a Fedora 23-like OS (Korora) and recently I got my hands on an old VCD. Korora recognized it as a "Video CD" all right and Nautilus even gave me an option to play using VLC. But as soon as I ...
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0answers
27 views
Linux kernel fault injection
I am trying to inject fail page allocator on run_test by using Linux Fault injection framework. My command is running successfully but I am not getting that which type of error I will get after inject....
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0answers
30 views
Is there a command that tells me information about a Linux kernel? [closed]
I want to find out some details about a Linux kernel, specifically by running a command that looks at a kernel file (i.e. vmlinuz-3.13.0-105-generic).
Is there such a command?
I tried "file" but it'...
0
votes
1answer
7 views
proc events not arriving over netlink connector (forkstat)
Kernel 3.14 stable-79.
I wish to trace fork(2) and related events using forkstat. For some
reason no events arrive over the socket. strace shows
that it hangs indefinitely in recv(2):
fstat64(1, {...
0
votes
0answers
11 views
Why UTS_RELEASE and UTS_SYSNAME are located in different files?
I've once edited UTS_RELEASE in Raspbian by using ncurses (via GUI). It worked, but my professor advised me to learn it by playing around on lower layers to get the basics and try to change ...
2
votes
1answer
16 views
dirty_ratio per device
I've recently examined a RHEL7.2 that hanged almost totally just because it have written to a CIFS filesystem. With the default settings of dirty_ratio = 30 and cifs being cached (for both reading and ...
0
votes
1answer
36 views
Dnf install kernel doesn't install kernel to /boot
I have the same problem as reported at https://ask.fedoraproject.org/en/question/73766/fedora-22-not-using-newer-kernal-after-dnf-update/
NOTE: the answers to that posting are not addressing the ...
4
votes
0answers
31 views
How is the page cache mapped in the kernel on 64-bit x86 architectures?
On a modern 64-bit x86 Linux, how is the mapping between virtual and physical pages set up, kernel side? On the user side, you can mmap in pages from the page cache, and this will map 4K pages in ...
4
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0answers
47 views
Kernel config for keyboard special LEDs
I'm building a 4.9 linux kernel (which is working great) for my T460s. The F1 key has a led that shows if sound is muted. I can't get this LED to work even when enabling all kinds of LED-relevant ...
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30 views
compiling the 3.3 linux kernel in 2016
[Update]: So I hope this is clear, essentially the kernel is wired to check the installed gcc version. So it doesn't seem to build with gcc6. One error more or less causes another one.
I'm trying to ...
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0answers
8 views
How to get usbip-tools after kernel 3.17 (after usbip 1.7)?
I'm using OpenSUSE 13.2 (maintained kernel 3.16) with separately installed kernel from Tumbleweed (4.6) so old usbip package doesn't work form me, yet I don't see any new usbip package for new kernel. ...
0
votes
1answer
268 views
Leap second Bug 31st Dec 2016
I just wanted to understand in a better way regarding the leap second bug.
Our Linux servers receive time from the windows PDC services, As per the update from the Microsoft regarding the leap second,...
6
votes
4answers
453 views
Delete new kernels /boot full
We've some Ubuntu 16.04 servers. unattended-upgrades are automatically enabled since 16.04 and the boot partition is on a separate partition.
Due to the automatic security updates the boot partition ...
0
votes
1answer
42 views
uCLinux (linux 4.9 nommu) VFS: Cannot open root device “(null)”
I'm stuck with this kernel panic.
What I want is to embed an initramfs into the kernel xip Image, but linux panic and tell me to pass a valid "root=" rootfs value. But WHY does Linux look for this ...
0
votes
1answer
31 views
What is the difference between BAT0 and ADP0 on the linux kernel?
Well I'm trying to identify a device in my program so I can classify and get the power status of a device. The thing is that I'm getting different values on the same OS but using different machines.
...
0
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2answers
72 views
Why don't we include File System drivers in the kernel itself instead of using Initrd/Initramfs
The Linux kernel contains very minimal code that is necessary to boot on a majority of devices but I don't get the point of having Initrd/Initramfs.As far as I've understood Initrd/Initramfs job is to ...
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0answers
57 views
update-initramfs Stuck
I ran apt upgrade and it wanted to remove an older kernel. I ran apt autoremove and it got stuck at update-initramfs: https://hastebin.com/jegeyitoxi.cpp3
Here's the referenced log: https://hastebin....
9
votes
1answer
133 views
gnupg 2.1.16 blocks waiting for entropy
Releases of gnupg from 2.1.16 (currently 2.1.17) block waiting for entropy only on first invocation.
Note: this isn't an attempt to generate a key, just to decrypt a file and start the agent.
The ...
0
votes
0answers
34 views
Failed to start fcoe service in CentOS 7 with kernel 4.9.0-1
I am currently working with linux centos 7 and a kernel version 4.9, and the fcoe service does not boot.
My server has the following settings:
# uname -a
Linux node21 4.9.0-1.el7.elrepo.x86_64 #1 ...
2
votes
1answer
66 views
How to find out a linux kernel ring buffer size?
Quite interested in the size of the kernel ring buffer, how much information it can hold, and what data types?
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votes
2answers
43 views
how to set alias for the folder in Linux [closed]
I want to set the alias for the "abc-abc" folder as "abc" in Linux.Can you help me?
EX: /raj/abc-abc/xyz/data
1
vote
1answer
57 views
Do system calls call themselves?
Do they? for example, I was thinking of the simple system call chown.
Does it call other system calls like read and write? How can we find out?
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1answer
19 views
how to find NIC card Bandwith in linux using native commands [closed]
How to find NIC card band width using native commands without using ethtool
18
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3answers
2k views
Is /dev/nvram dangerous to write to?
I found information that nvram is used for BIOS flashing/backup and that it contains some bios related data. Would cat /dev/random > /dev/nvram permanently brick computer? I'm quite tempted to type ...
0
votes
1answer
28 views
Regarding linux package
I need to get below packages installed on Oracle Linux 6.7.
However, when installing I am getting below error.
[root@oraclelinux1 ~]# yum install sysstat-9.0.4-11.el6-x86_64
Loaded plugins: refresh-...
3
votes
1answer
25 views
Monitor I/O writes to ISA card
I am using a analog / digital I/O card in many projects (DMM-16-AT from Diamond Systems), which is a PC/104 (ISA equivalent) card.
The problem is, that there are 8 digital outputs at address BASE + 3 ...
1
vote
1answer
58 views
How to determine which kernel version to install?
I've recently installed a fresh copy of Linux Mint 18 on my Lenovo T440p and everything is working great except for one thing: I have trouble when resuming from a "Suspend"- I get no GUI, both of my ...
1
vote
1answer
60 views
What format is this kernel image? Can not extract kernel code from it?
I got an android image which contains:
-rwxr-xr-x 1 root root 69206016 Dec 16 17:01 cache.img
-rwxr-xr-x 1 root root 6024864 Mar 23 2016 Image
-rwxr-xr-x 1 root root 1108329 Mar 7 2016 ...
0
votes
1answer
28 views
Minimal kernel config repositories
I've been looking in my various Linux builds in those file:
/proc/config.gz
/boot/confi
/boot/config-$(uname -r)
And I'm noticing some major differences in number of active linux configs.
For ...
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0answers
14 views
How to revert to old source address selection
I'm trying to migrate some programs from an old server to a newer one (Centos 6 to Centos 7). I'm having problems because it seems that the source address selection algorithm has changed between the ...
3
votes
3answers
73 views
Compiling a kernel on a different system
I work for Nimbix and have access to some pretty powerful multicore systems, I intend to make a kernel compilation service.
The systems can have upto 128 cores and in my initial test with 32 cores, I ...
1
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0answers
219 views
How to get IOMMU to work at Gentoo? [closed]
I'm trying to get IOMMU to work using this manual, I've already configured kernel and bootloader but it still not working.
Here is how do I try to check it:
$ dmesg | grep IOMMU
[ 1.731110] ...
1
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0answers
34 views
How to hide the fact that I have Kali in the boot partition of my encrypted system?
I have an encrypted Kali installation.
I don't want to share the fact that I am using Kali, hence my intention to try hide any trace of Kali in the boot partition.
How can I get rid of every kali ...
1
vote
1answer
32 views
Understanding kernel build options (interpreters?) [closed]
I am building a kernel for the first time for an embedded ARM platform. I am surprise that I can find options such as games and interpreters like python or lua.
Are they part of the kernel? Why such ...
1
vote
1answer
19 views
Can seccomp be used to enforce deterministic execution?
seccomp(2) can be used to severely limit what syscalls can be made from a particular process, including syscalls that introduce non-determinism such as getrandom(2) and gettimeofday(2). Is there a way ...
