General :: Extracting Kernel Config From Kernel Image -- Extract-ikconfig
Jan 22, 2010
I'm trying to run extract-ikconfig because I've mistakenly deleted an old kernel config that I'd like to recover. However, when running the script from the latest (2.6.32.5) tree I run into this error:
Quote:
ERROR: Unable to extract kernel configuration information.
This kernel image may not have the config info.
Coincidentally, this happens with all of my kernel images. Is it a fixable problem? I should really set CONFIG_IKCONFIG_PROC next time..
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Oct 17, 2010
I'm looking to extract a config from a working kernel..that much was pretty easy..all ya gotta do is "cp /proc/config.gz ." which will put it in whatever directory you're currently in and then do a "gzip -d config.gz" to get the config file.
Now...after that it gets a bit tricky..Linus says you should never compile a kernel in /usr/src/ because those header files in ../include should never change. He says you should extract a new kernel gz in your home directory and compile it there. I tend to agree (who am I to argue?). Anyway..whereever your sources are this is where you need to copy the config file...
Like this...my home dir is "/home/dart". So I would put the kernel sources there under "/home/dart/linux". I would cd to /home/dart/linux and do "cp /proc/config.gz ." then "gzip -d config.gz" which should leave you with a file called "config", then "mv config .config"
Now here's where I run into a problem..when I do "make xconfig" I get this...
Tried to install the qt3-devel packages from CD but guess what? I ran into cdrom errors which is what I was trying to fix in the first **** place...catch 22 eh?
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Jul 16, 2009
I install fedora on my usb-hdd. Sometimes i boot it from real machine, sometimes i boot from virtual machine (kvm). When I boot from real machine, hdd driver is usb-storage, when i boot from virtual machine hdd drivers are ata_generic and pata_acpi.
Everytime i update kernel, mkinitrd only create initrd image contains only hdd driver current running, and I must recreate initrd manual with all preload hdd driver. How to config fedora to everytime update kernel, mkinitrd can make initrd image with all hdd driver I need?
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Apr 19, 2010
I have following problem - I damaged my system (Gentoo - by rebuilding using gcc 4.5) beyond repair. I unmounted /home, copied /etc + other important files and I've started reinstalling system.However I forgot to copy init script. It is still present in kernel image that I have. How to extract it? Please note that initrd is not a separate file but is in the kernel image.
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Aug 10, 2011
I kept bumping into it all the time, only now when I need it I can't find it anywhere! What architecture is the kernel of my machine?
2.6.18-194.el5
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May 23, 2011
I accidentally deleted my .config for my kernel configuration on Linux, and seem to remember there was a way to retrieve the kernel configuration via the proc filesystem somehow. Is this still possible, and if so how would I do it?
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Apr 20, 2010
the things i've tried:
1. Created an asm bootloader code that calls a c function which just prints a hello message.
2. Compiled both and linked them using LD command using a .ld file available.
Steps followed from http://wiki.osdev.org/Bare_bones.I get a kernel.bin file which is of ELF format. I've set up a tftp server using tftpd32 tool and created the necessary pxelinux.cfg files.
Now how do i create a bootable kernel image out of the elf file. The steps given in the above website to create an image doesn't help.
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Mar 25, 2011
I know that it is possible to get the kernel version from a running system using "uname" command.I have a kernel image file in linux/arch/arm/boot/uImage.Is it possible to get similar information from this image file? and how?
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May 5, 2011
I installed unetbootin, and picked linux mint because i heard mint is for beginners.I use HP mini, and connected USB drive.after installation is completed, restart machine, and changed boot order,this was on screen;"Invalid or corrupt kernel image"boot:press tab key for options.
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May 23, 2010
Can you please let me know where to find minimum kernel image for my ColdFire platform to boot from ? Please be informed that at this stage I am not restricted to use an specific Linux distro and just I need to have the minimum kernel image possible size.
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Dec 7, 2010
I used kernel 2.6.5 in vmware I copied new kernel 2.6.37 image and initrd from other machine,to replace the current one after reboot,the initrd.img can be loaded,but soon it report "/dev/sda1 not found, waiting for I need to do anything in initrd.img to make it recognize "/dev/sda1" device? /dev/sda1 is vmware scsi disk.
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Jan 15, 2011
I just downloaded the newest version of Ubuntu onto a USB drive. I put it into my computer and when it was loading Ubuntu, it said "Could not find kernal image: vesamenu.c32".
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Sep 16, 2010
i'm using this guide videos - howto: debian linux kernel compilation, part 1 and the author says i need kernel 2.6.26 this version of kernel doesnt longer exist in kernel.org website and the only 2.6.26 i found is a patch here. should i use the patch? or download another version of kernel?
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Sep 23, 2010
I don't know almost anything about it so I was thinking of asking this question from the experts.I recently downloaded the xPUD 0.9.2.I LOVE that OS!It's simple,fast and smart.I just would like to add some other programs to it somehow.Is that possible for ex. extracting the image,modifying files,then remaking the iso?(Talking in Windows7)I would like to add some programs like Wine and some games also.Please reply as soon as possible because the xpud site is down for bandwidth exceeded.
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May 19, 2010
I just downloaded the unrar extension from the software center, and when I try to extract
a file from a rar archive unto my desktop,ays it extracted the file but nothinghappens.When I press on "Show the Files", it opens the folder which is supposed to contain the files, and they are not there
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Dec 13, 2010
I made a bzip2 file by
bzip2 -c /home/os/picture1 > /home/os/Desktop/pic.image
bzip2 -c /home/os/picture2 >> /home/os/Desktop/pic.image
But now extracting pic.image by bzip2 -d /home/os/Desktop/pic.image returns
bzip2: Can't guess original name for pic.image -- using pic.image.out
And then it just creates one file pic.image.out.
How do I access picture1 and picture2 from pic.image?
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Feb 9, 2009
I have Mandrake 9.0 with 2.4 kernel, this comes with a GUI kernel config, its a nice feature as it details each kernel item. I installed a Mandriva 2009 edition w/2.6.27 kernel and want to add the GUI kernel config, does anyone know of a package to do this
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Mar 14, 2010
I'm experimenting with 2.6.33-ck1 mainly because I want to try the BFS. I successfully configured and installed the patched kernel, but I'm experiencing various problems on the desktop. The biggest is Chromium not working at all, but there are several others, including graphical glitches in firefox. I'm sure I left some important module off or made a mistake for some settings My question is that is there a 2.6.33-fc12 kernel yet, and does it have a .config available? I'd like to load those settings in menuconfig and use them as a starting point to properly configure and complie a -ck patched kernel.
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Jun 20, 2011
have a sample kernel .config, so I can compile a small custom kernel on my vps? I tried to make it alone,but I removed stuff,so that my VPS won't start anymore. Virtualization is KVM, running on a Core 2 Duo.
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Jun 4, 2010
I would like to compile my own kernel. I am familiar with how to do it and have done it in the past so I'm not looking for a how to compile a kernel. In the kernel config are many, many options. In the past when I compiled kernels I always wondered about what is needed and used. What is the best way to determine what is currently used, not set or enabled in the existing config, but actually used by my existing kernel?I have a general idea of what is loaded and could do trial and error, turn this and that off, recompile, etc but is there an easier way?
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Feb 11, 2011
The 486 kernel works just fine, and while I have only 1GB of RAM at the moment I hope to have 2GB someday and would like to take advantage of the dual core CPU, so I would like to configure grub to run the 686 kernel by default. For whatever reason, it runs the 486 right now and the 686 fails in a major way: there is no network connectivity at all. It could be plugged into my cable modem router and it shows no wired connections. The fact that one works and the other doesn't puzzles me since I haven't touched either since the install and a few rounds of upgrades.
I should mention I'm newbie but getting better; I managed to install debian on this x60, yet while preserving the factory install rescue & recovery partition and preserving the factory install MBR so that ibm-specific hardware functions (thinkvantage button, etc.) still work. This required me to use dd to copy the first 512 bytes of my debian partition to a file in the windows partition, etc., and modifying the windows bootloader. (I wish I had learned dd long ago--it rocks). I did this because if I ever resell the X60, the fact is most people use MS Windows and having that partition adds a perception of value to some potential buyers; not to mention I paid $ for it (I was young & stupid) so why should I delete it. I also backed up the recovery partition on another drive using dd over NFS in case the hd ever heads south.
Anyway, I've never been comfy with messing with the kernel. I did once recompile a module for ALSA because it had a bug in it for an old Yamaha integrated sound card on an old PIII and the newer version worked [alsa fails on this x60 too but I think I found a post on here that has a solution I will try later]. But I'm clueless as to networking modules, not to mention the correct module is installed already from Intel for this chipset. So what is there to do?
Here's a clue: the ifconfig output is radically different from the 686 and 486 kernels. Looks like hardware is not being detected since eth0 fails to show:
I would show the diff output below if it weren't so long--and not allowed--upon 2 text files, the first holding the output of modprobe -l under the 486 kernel and the second under the 686 kernel.
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Jun 15, 2010
I have recompiled a few kernels, but all on 32bit systems so not sure if that has anything to do with it.
Running Arch Linux 64bit, most recent version.
Kernel Output:
Code:
My first thoughts was that it might be my grub bootloader configuration, so had a big play around with that but it didn't fix it. Also made sure support was built for filesystems. However almost all that Fstab mounts are ext3 anyway, and certainly the root and /boot are. Now thinking it may be a memory error so will run a check when I shutdown.
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Feb 13, 2011
Dell laptop booting from a USB stick with a CentOS 5.5 minimum installation.
Uncompressing Linux...OK, booting the kernel.
Red Hat nash version 4.2.1.13 starting
sda: assuming drive cache: write through
sda: assuming drive cache: write through
mount: error 6 mounting ext3
mount: error 2 mounting none
switchroot: mount failed: 22
umount /initrd-dev failed: 2
Kernel panic - no syncing: Attempted to kill init!
1. Does minimum installation not drop on a kernel or initrd with ext3 support? I can't imagine that's true, but have to ask.
2. The USB stick is single partition ext3. Maybe there is some limitation specifically related to USB stick booting that requires boot to be FAT16 or FAT32? Except the CentOS 5.5 installer refuses to let me install on either FAT.
3. How can I do the equivalent of lsmod on a linux installation that will not boot? i.e. I have CentOS x86_64 running in VirtualBox, I can plug the USB stick in there, so how do I get information on the USB stick's kernel and initrd if I can't boot from it?
4. Is it possible to rebuild the i386 based initrd on this USB stick, when the computer is not booted from that stick, with a system that's x86_64 based?
System Info:
Dell Latitude i686 Laptop which has run CentOS 5.5 and Fedora 12,13,14 in the past, and boots from Fedora 14 Live CD transferred to a USB stick. So I know USB booting is possible on this machine, and this stick.
The process of creating the stick:
CentOS 5.5 i386 on a USB stick. Old Dell i686 laptop which has previously run CentOS 5.5 installed from DVD, and has successfully booted from this same USB stick holding transferred Fedora 12,13,14 Live CDs. CentOS 5.5 was installed onto the USB drive directly by the CentOS 5.5 DVD installer (running virtualized in VirtualBox 4.02 on Mac OS X 10.6.5.). No errors or complaints during installation.
For whatever reason, the installer did not do some things correctly. First Grub wasn't working correctly, I got that sorted out and have the Grub+CentOS splash screen, it finds vmlinuz and the initrd, and then I get a kernel panic.
Ext3 was built into the kernel and that's why I'm getting this message. I do not know how the installer would have dropped a kernel or initrd during instalation that that don't contain such a basic thing that obviously comes in linux kernel 2.6.18-89 EL.
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Oct 13, 2010
I have a config file called hosts.cfg.
It contains entries like this:
Quote:
There are many more of these entries in the file, over 500, all in this same format: each host has a "define host" followed by 18 directives contained in squiggly brackets.
If I want to know all the hosts that are in the hostgroup called SERVER_GRP, I suppose I would need to read every hostgroups line (8th directive in squiggly brackets) that contains SERVER_GRP and output the corresponding host_name line (1st directive in squiggly brackets) from that entry.
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Nov 26, 2010
Is there a way to get the matching Linux kernel headers automatic on a regular kernel update via the Ubuntu packed manager? Every time I get a new kernel I must do an aptitude install linux-headers-`uname -r`
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Jun 25, 2010
I am running an Hp Pavillion dv6000 with the Broadcom card that never seems to work for Linux. I recently talked with my friend who said he found a way to get it work.following his instructions I opened Synaptic and checked the package bmcwl-kernel-source to be installed.I went through the process of it all and it said it had install successfully. I restarted the computer and when I tried to enter my operating system I got this error "Kernel panic - not syncing : VFS : Unable to mount root fs on unknown - block(8,1)"
I have previous versions of Linux on my computer so I can still get in to those if need be but I don't know how to undo what I did or why it isn't working for that matter. Does anyone have any ideas as to why I am getting this error and how I can fix it?
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Jul 14, 2011
I am using FC15.I need a kernel with a different configuration - with the "Preemptible Kernel (Low-Latency Desktop)" option in the Processor Type and features menu. I need this to support my firewire audio device. I would like to build a new kernel RPM from the SRPM so that i can keep a clean system with RPMs for all files, and I don't really want to manually override the kernel bypassing RPM.I am following **exactly** the process described there - I install the SRPM, unpack the source, then use the starting sample config files in the BUILD folder to create a new customised .config file with the new option, then copy this back to the SOURCE folder.
This works perfectly if I make a standard kernel. But I cannot get the process to work if I change the config file. Every time I compile I end up with exactly the standard kernel -- a vanilla i686 kernel, without my custom config.I believe the problem is that when I run rpmbuild to compile the kernel, this process overwrites my config option. I found that there is a script (merge.pl) which creates new config files dyanmically for all kernel options based on fragments in the SOURCE folder. It looks like the script never uses the config file that I am putting into the SOURCE folder.The wiki page suggests using this command to copy my custom config file cp .config ~/rpmbuild/SOURCES/config-`uname -m`
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Sep 21, 2010
I've read about some sort of tools that help with kernel configuration.Can anyone tell me anything about these?It seems that you use the tool(s) on a running system. You use the running system for a while. The tool(s) gathers data and leaves bread crumbs. The tool(s) then process the bread crumbs to create a candidate config file for a fresh kernel build. The goal is a kernel build that contains parts you actually use and omits parts you don't use or don't need -- all the while using arcane knowledge of dependencies among various kernel features to (hopefully) avoid building a still-born kernel.
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Mar 14, 2010
Anyone can tell me how to enable and config auditd in linux kernel 2.6.9-5.EL. I have only found command auditd and auditctl in server that run kernel 2.6.9-5.EL. I ran auditd & and can saw auditd ran in my server. But I couldn't do anything with auditctl, no status, no rules, nothing :| . I tried to find audit.rules or auditd.conf but that nothing I can find.
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Sep 8, 2009
This is my first effort in making something more appropriate for laptop users (exclusively). This is a kernel config for 2.6.30.5. I started with the Slackware Generic-SMP 32bit kernel config (this is a 32bit kernel config). All credit for (in my opinion) the best starting place for any kernel config goes to Patrick Vokerding. (Please tell me if I am or am not doing this properly in terms of respecting the work of others, GPL, GNU, etc.)
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