Linux-Noob Forums - Kernel Related

Device driver tutorials

Tue, 17 Feb 2015 10:58:24 +0100

Please point me to some good linux device drivers tutorials. I need to create a driver that will read data from I2C bus, parse it and make parsed data available for user space apps.

sysctl net.ipv4.tcp_syncookies command returns unknown key

Fri, 01 Mar 2013 00:21:32 +0100

[root@centos /]# sysctl net.ip4v.tcp_syncookies

error: "net.ip4v.tcp_syncookies" is an unknown key

in Centos 6

the issue may be that I'm following a slightly old manual (2009) which more often refers to Fedora/RHEL and very rarely Centos. the key does exist under the path, I'm looking at it..

Thanks in advance for your help :-)

Very Odd issue

Thu, 30 Aug 2012 05:06:10 +0200

Linux mint 13 "Mate"

I have an AMD 6 core CPU but in system monitor it only reports as 1 cpu. It is also heavily loaded at all times over 15 percent at a minimum, before it would show each core and on an idle system It would be odd to see a core jump over 5 percent. So it seems like the system is running on only one core. I have also tried a fresh install.

What are some steps I should take before I go to another distro to see if the problem persist and start wonder if my CPU/Sysboard has gone bad.

output from uname -a

Code:
Linux mint 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linu

output from cat /proc/cpuinfo

Code:
mint@mint ~ $ cat /proc/cpuinfo

processor : 0

vendor_id : AuthenticAMD

cpu family : 21

model  : 1

model name : AMD FX(tm)-6100 Six-Core Processor            

stepping : 2

microcode : 0x6000626

cpu MHz  : 3311.242

cache size : 2048 KB

physical id : 0

siblings : 1

core id  : 0

cpu cores : 1

apicid  : 16

initial apicid : 0

fpu  : yes

fpu_exception : yes

cpuid level : 13

wp  : yes

flags  : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc up rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 popcnt aes xsave avx lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 nodeid_msr topoext perfctr_core arat cpb npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold

bogomips : 6622.48

TLB size : 1536 4K pages

clflush size : 64

cache_alignment : 64

address sizes : 48 bits physical, 48 bits virtual

power management: ts ttp tm 100mhzsteps hwpstate cpb

Kernel Panic boot SL live dvd

Thu, 22 Dec 2011 22:29:29 +0100

I finally got my netbook. Nice and small. I create a bootable usb using sl live usb creator and I tested it out on my laptop and it boots without any problems. I then tried to boot from my usb on my netbook and I am able to get in to the grub menu and as soon as I select boot from LiveDVD SL starts to load and then I get the error: Kernel Panic - not syncen: Attempting to kill init! I'm pretty sure it's some type incompatible hardware thing. I google all around, but I only found answers like made a new live usb, compiled a custom kernel,(can't do that if my os isn't installed) checking bios settings etc. I'm kindda out of options. Any ideas?

grub booting old kernel

Tue, 08 Nov 2011 23:15:39 +0100

i have updated from debian lenny to debian squeeze,

installed a new (custom) kernel to run vservers.

for some reason grub keeps booting the old kernel (i do not have console access, only ssh)

, it should boot Linux 2.6.32-5-vserver-amd64 but it boots Linux 2.6.18-6-vserver-amd64…

when rebooting after installing the first time, the system hung, and i rebooted and the old kernel was loaded i guess, how to reset?

anyone knows?

Thanks in advance!

-(~:#)-> cat /boot/grub/grub.cfg

#

# DO NOT EDIT THIS FILE

#

# It is automatically generated by grub-mkconfig using templates

# from /etc/grub.d and settings from /etc/default/grub

#

### BEGIN /etc/grub.d/00_header ###

if [ -s $prefix/grubenv ]; then

load_env

fi

set default="0"

if [ "${prev_saved_entry}" ]; then

set saved_entry="${prev_saved_entry}"

save_env saved_entry

set prev_saved_entry=

save_env prev_saved_entry

set boot_once=true

fi

function savedefault {

if [ -z "${boot_once}" ]; then

saved_entry="${chosen}"

save_env saved_entry

fi

}

function load_video {

insmod vbe

insmod vga

insmod video_bochs

insmod video_cirrus

}

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

if loadfont /usr/share/grub/unicode.pf2 ; then

set gfxmode=640x480

load_video

insmod gfxterm

fi

terminal_output gfxterm

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

set locale_dir=($root)/boot/grub/locale

set lang=en

insmod gettext

set timeout=5

### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###

set menu_color_normal=cyan/blue

set menu_color_highlight=white/blue

### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###

menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-vserver-amd64' --class debian --class gnu-linux --class gnu --class os {

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

echo 'Loading Linux 2.6.32-5-vserver-amd64 ...'

linux /boot/vmlinuz-2.6.32-5-vserver-amd64 root=UUID=6cbed369-7638-4094-9b47-7e57d102ec5a ro quiet

echo 'Loading initial ramdisk ...'

initrd /boot/initrd.img-2.6.32-5-vserver-amd64

}

menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-vserver-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os {

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

echo 'Loading Linux 2.6.32-5-vserver-amd64 ...'

linux /boot/vmlinuz-2.6.32-5-vserver-amd64 root=UUID=6cbed369-7638-4094-9b47-7e57d102ec5a ro single

echo 'Loading initial ramdisk ...'

initrd /boot/initrd.img-2.6.32-5-vserver-amd64

}

menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-amd64' --class debian --class gnu-linux --class gnu --class os {

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

echo 'Loading Linux 2.6.32-5-amd64 ...'

linux /boot/vmlinuz-2.6.32-5-amd64 root=UUID=6cbed369-7638-4094-9b47-7e57d102ec5a ro quiet

echo 'Loading initial ramdisk ...'

initrd /boot/initrd.img-2.6.32-5-amd64

}

menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os {

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

echo 'Loading Linux 2.6.32-5-amd64 ...'

linux /boot/vmlinuz-2.6.32-5-amd64 root=UUID=6cbed369-7638-4094-9b47-7e57d102ec5a ro single

echo 'Loading initial ramdisk ...'

initrd /boot/initrd.img-2.6.32-5-amd64

}

menuentry 'Debian GNU/Linux, with Linux 2.6.26-2-amd64' --class debian --class gnu-linux --class gnu --class os {

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

echo 'Loading Linux 2.6.26-2-amd64 ...'

linux /boot/vmlinuz-2.6.26-2-amd64 root=UUID=6cbed369-7638-4094-9b47-7e57d102ec5a ro quiet

echo 'Loading initial ramdisk ...'

initrd /boot/initrd.img-2.6.26-2-amd64

}

menuentry 'Debian GNU/Linux, with Linux 2.6.26-2-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os {

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

echo 'Loading Linux 2.6.26-2-amd64 ...'

linux /boot/vmlinuz-2.6.26-2-amd64 root=UUID=6cbed369-7638-4094-9b47-7e57d102ec5a ro single

echo 'Loading initial ramdisk ...'

initrd /boot/initrd.img-2.6.26-2-amd64

}

menuentry 'Debian GNU/Linux, with Linux 2.6.18-6-vserver-amd64' --class debian --class gnu-linux --class gnu --class os {

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

echo 'Loading Linux 2.6.18-6-vserver-amd64 ...'

linux /boot/vmlinuz-2.6.18-6-vserver-amd64 root=UUID=6cbed369-7638-4094-9b47-7e57d102ec5a ro quiet

echo 'Loading initial ramdisk ...'

initrd /boot/initrd.img-2.6.18-6-vserver-amd64

}

menuentry 'Debian GNU/Linux, with Linux 2.6.18-6-vserver-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os {

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

echo 'Loading Linux 2.6.18-6-vserver-amd64 ...'

linux /boot/vmlinuz-2.6.18-6-vserver-amd64 root=UUID=6cbed369-7638-4094-9b47-7e57d102ec5a ro single

echo 'Loading initial ramdisk ...'

initrd /boot/initrd.img-2.6.18-6-vserver-amd64

}

menuentry 'Debian GNU/Linux, with Linux 2.6.18-6-amd64' --class debian --class gnu-linux --class gnu --class os {

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

echo 'Loading Linux 2.6.18-6-amd64 ...'

linux /boot/vmlinuz-2.6.18-6-amd64 root=UUID=6cbed369-7638-4094-9b47-7e57d102ec5a ro quiet

echo 'Loading initial ramdisk ...'

initrd /boot/initrd.img-2.6.18-6-amd64

}

menuentry 'Debian GNU/Linux, with Linux 2.6.18-6-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os {

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

echo 'Loading Linux 2.6.18-6-amd64 ...'

linux /boot/vmlinuz-2.6.18-6-amd64 root=UUID=6cbed369-7638-4094-9b47-7e57d102ec5a ro single

echo 'Loading initial ramdisk ...'

initrd /boot/initrd.img-2.6.18-6-amd64

}

menuentry 'Debian GNU/Linux, with Linux 2.6.18-5-amd64' --class debian --class gnu-linux --class gnu --class os {

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

echo 'Loading Linux 2.6.18-5-amd64 ...'

linux /boot/vmlinuz-2.6.18-5-amd64 root=UUID=6cbed369-7638-4094-9b47-7e57d102ec5a ro quiet

echo 'Loading initial ramdisk ...'

initrd /boot/initrd.img-2.6.18-5-amd64

}

menuentry 'Debian GNU/Linux, with Linux 2.6.18-5-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os {

insmod part_msdos

insmod ext2

set root='(hd0,msdos2)'

search --no-floppy --fs-uuid --set 6cbed369-7638-4094-9b47-7e57d102ec5a

echo 'Loading Linux 2.6.18-5-amd64 ...'

linux /boot/vmlinuz-2.6.18-5-amd64 root=UUID=6cbed369-7638-4094-9b47-7e57d102ec5a ro single

echo 'Loading initial ramdisk ...'

initrd /boot/initrd.img-2.6.18-5-amd64

}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###

### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###

### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###

# This file provides an easy way to add custom menu entries. Simply type the

# menu entries you want to add after this comment. Be careful not to change

# the 'exec tail' line above.

### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###

if [ -f $prefix/custom.cfg ]; then

source $prefix/custom.cfg;

fi

### END /etc/grub.d/41_custom ###

can filesystem become corrupt?

Wed, 31 Aug 2011 08:19:05 +0200

I copied all my data from my desktop over to my laptop(now it keeps saying out of diskspace, clean up date to add more file)

and now my applications/drivers keep on crashing(ie:firefox,chrome, thunderbird,wireless).Is it possible

that a filesystem(ext4) can become corrupt after being being overfull for too long? Will check the logs

later when I get back home.

Chromium OS fails to boot kernel.

Sat, 08 Jan 2011 17:27:07 +0100

Hello,

I'm new here, and i figured this should be here.

I'm running windows 7 and ubuntu, and i tried to add Chromium OS.

I followed the instructions here: http://chromeos.hexxeh.net/wiki/doku.php?id=multiboot

Everything seems to work out, but then when i try to boot it from Burg (with Grub 2) it hangs on this:

decompressing linux... parsing elf... done.

Booting the kernel.

_

The underscore is still blinking, but there doesnt seem to be any progress so i turned the system off after something like half an hour.

What am i doing wrong?

Thanks in advance,

Leon.

Releasing beta code for selected customers (ZFS to Linux)

Fri, 17 Sep 2010 12:24:54 +0200

KQ Infotech Pvt. Ltd. is responsible for spamming many Linux forums. Being a clueless company, KQ believes that spamming forums advertising the company's capabilities will raise awareness of the company and drive visitors to their site. We are also firm believers in talking about ourselves in the third person, because it sounds more unbiased.

KQ’s expertise in understanding how customers react to their first post contributing nothing of value to any forums greatly undermines any standing they have in the Linux community. After dedicated effort, we have finally created a product that is available for the selected beta customers, but rather than alert those selected beta customers by using an email circular or our own customer forums, we feel the best way of communicating this information is to spam the hell out of every forum possible. Please log on to our website to apply to become one of these selected beta customers in the vain hope you will be selected, despite the fact we have already mentioned we have selected them so you've missed the boat, I'm afraid, but we can still demonstrate how effective spamming forums is. We don't work like most open-source communities that put their products live on sourceforge or available for public testing, we require that you jump through hoops to register yourself through the beta form in order to get the code for testing. Once you fill the form, we have your details, and one of our representatives will be contacting you by spamming forums once again.

As we are selecting a batch of 25 beta customers from different testing environments, please await until we get at least this number, since we have no beta testers nor public forums of our own. To allow proper support bandwidth for beta customers, we have limited the batch to 25, because we are crap at capacity planning and have no concept of using anything like torrents or network peering to make the data available. We would be increasing the bandwidth as and by the beta matures, because we treat you as paying customers, and not as testers, so expect to pay something to cover the cost of our bandwidth. We are in the process of selecting our first batch of customers, so please register yourself through the form now, otherwise we won't have any testers (sorry, customers) to run our tests.

Thank all search engines for indexing this forum post, and for showing just how many times KQ has spammed numerous forums and had their post pulled.

Broadcom native support

Sun, 08 Feb 2009 11:18:55 +0100

Hey dudes!

Is broadcom support native nowadays?

I want to install linux again, but I want to know if broadcom is supported natively.

Also my question is, is the Intel 915GM supported properly yet?

So far I have tried several distro's but none of em support lower resolutions, which I need to play some windows games. (Vice City and The Sims mostly)

PAE and RAM

Mon, 06 Oct 2008 16:48:28 +0200

I am currently running Fedora 8 32bit version. It's only recognizeing 3.1Gb of the 4GB of ram I have installed. I tried to install the PAE for my kernel but it says its already installed. Is there anything else I need to do to make it recognize the rest of my RAM? Any info would be appreciated. If there is any other info you need from me on this please let me know.

VMWare tools Workstation 5.0.0 build 13124

Fri, 13 Jun 2008 04:11:26 +0200

Ok so I am complete Noob to this (well not complete) and I have tried so hard to install VMware tools so my resolution will be better than 800x600.

So far I have extracted the .tar.gz to a folder I like.

I navigated to the .pl (perl) file I need to run to install the tools.

It starts running and I follwed the instructions that the "Read_Me" file said to accept all default locations to install. So I did that and came up with a question that,

asked me to find where the Kernel files with C something was, so I found THAT and typed the folder location as needed and got this error

Linux_VMWare_problem.bmp

IF you could give me some clue as the next step I can take, I would really appreciate it. (Oh i cannot spell really well either)

Linux_VMWare_problem.bmp (Size: 994.05 KB / Downloads: 771)

Gentoo Installation Problems

Tue, 25 Mar 2008 17:40:59 +0100

I wanted to experience even more power and learn more about linux.

So, (after some advice from a friend) i decided to try Linux Gentoo (AMD64).

So i printed the gentoo handbook (the whole thing 0.o) from gentoo.org and burned a livecd.

I followed the instruction in the handbook, I manually configured the kernel. Then i went to compile. (using make)

I get a compiling error. Something like this: "internal compiler error: segmentation fault". I think thats it, i couldn't copy and paste

The odd thing is, when i repeated this a few times the error will occur in different places.

But it always fail, Different places each time. Almost at random?

This is the first time i have tried to install a linux distro this complex. And the first time i have compiled the kernel.

So, im really lost.

Thanks :-)

make a new kernel rpm

Wed, 05 Dec 2007 11:23:49 +0100

thanks to Randall for assistance with this

here's how,

verify that you have the following installed in your distro (if it supports it)

rpm-devel, curses, ncurses-devel and gcc and required deps.

Once done, download the latest stable kernel from http://www.kernel.org

currently that is 2.6.23.9

once downloaded, unzip the file

Code:
bunzip2  kernel

then cd to the new kernel directory

then untar it with

Code:
tar xvpf kernel

then prepare it for compiling...

Code:
make clean && make mrproper

now we want to copy over default settings from a shipped kernel to the new one we will compile

Code:
cp /boot/config-`uname -r` ./.config

where uname -r is the value from your current kernel eg:

Quote:[root@localhost ~]# uname -r2.6.23.1-49.fc8

now that you have copied over the 'default settings' from the shipped kernel lets configure the new one by

Code:
make menuconfig

then do a

Code:
make rpm

the above will only make an RPM file of the new kernel for you, if you wanted to test that kernel you'd have to install the rpm as normal.

If you want to make the kernel the 'normal' way then do as follows

Code:
make

make modules_install

make install

below is a sample of me actually going through all the steps on a SLED 10sp1 machine.

Quote:wget http://www.kernel.org/pub/linux/kernel/v2.....6.23.9.tar.bz2

43.4 MB

in yast, i searched for rpm-devel and then isntalled it.

next in yast i searched for curses and isntalled ncurses-devel and the 32bit version of same. (ncurses-devel-32bit)

then

bunzip2 linux-2.6.23.9.tar.bz2

then

tar xvpf linux-2.6.23.9.tar

then once uncompressed

cd linux-2.6.23.9/

installed gcc and libmudflap for compiling... in yast.

make clean && make mrproper

cp /boot/config-2.6.16.53-0.16-smp ./.config

(copies the current sled10 settings in the kernel to the new kernel)

make menuconfig

make

make modules_install

make install

make rpm

Wrote: /usr/src/packages/SRPMS/kernel-2.6.23.9smp-2.src.rpm

Wrote: /usr/src/packages/RPMS/x86_64/kernel-2.6.23.9smp-2.x86_64.rpm

Executing(%clean): /bin/sh -e /var/tmp/rpm-tmp.97342

+ umask 022

+ cd /usr/src/packages/BUILD

+ cd kernel-2.6.23.9smp

+ exit 0

rm ../kernel-2.6.23.9smp.tar.gz

linux-hiz9:/kernel_update/linux-2.6.23.9 #

grub changing kernel

Wed, 07 Nov 2007 12:59:08 +0100

I was reading this https://www.linux-noob.com/forums/index.php?showtopic=2928 and have a unique situation.

I use MythDora 4 (Fedora Core 6 with MythTV distribution). Basically, in order to set the wake up time I set the clock, then I have to have system reboot into a kernel that halts the system so the clock in bios gets set properly. I had this working before in FC 5. But now it doesn't seem to like it anymore.

Code:
echo "savedefault --default=1 --once quit" | grub

I get an error 15: file not found.

My grub.conf:

Code:
default saved

default=0

timeout=10

splashimage=(hd0,0)/grub/splash.xpm.gz

hiddenmenu

title MythDora (2.6.20-1.2944.fc6)

    root (hd0,0)

    kernel /vmlinuz-2.6.20-1.2944.fc6 ro root=/dev/VolGroup00/LogVol00 rhgb quiet

    initrd /initrd-2.6.20-1.2944.fc6.img

    savedefault

title Power Off

  savedefault --default=0

  halt

For laughs I added the below after halt. This stopped the error 15, but default was still 0 at top.

Code:
kernel /vmlinuz-2.6.20-1.2944.fc6 ro root=/dev/VolGroup00/LogVol00 rhgb quiet

Smart card reader

Thu, 18 Oct 2007 16:20:59 +0200

Hey all,

I have the following smart card reader; O2Micro OZ711SP1 running with the 2.6.23.1 kernel. I looked on (http://www.linuxnet.com/sourcedrivers.html) which

provide the O2Micro Smartcardbus PCMCIA Smartcard Reader driver however, it does not support the 2.6.23.1 kernel because of the changes made

to PCMCIA.

Does anyone have any suggestions on getting this working?