i am trying learn to program linux kernel modules and smoothly transition in device driver programming. I have a year and a half worth of programming in C and have been using linux for years!! But my question is how do i compile a module? I got as far as coding it but am stuck as of now.
View 2 Repliesubuntu could delay kernel module installation until device is inserted?Take my usb ath9271 wifi adapter as an example: when kernel boot up, no ath modules are installed until usb wifi apdapter is inserted, ath related modules are insmod.Could anybody how to achieve this? udev or something else?
View 5 Replies View RelatedI am trying to run a program with two modules and many subroutines. Each module and subroutine is in a seperate file. The main program is "nma.f90". I am somewhat a beginner in fortran, and have not written the code myself. I am using the following to compile and run the program :
gfortran -ffree-form -w nma.f90 sub_pot_coulomb.f sub_hess_numer_coulomb.f sub_hess_lj.f sub_hess_exp6.f sub_gethinv.f sub_poten.f sub_pot_stretch.f sub_pot_bend.f sub_slist.f sub_blist.f sub_tlist.f sub_imp_tlist.f sub_hess_stretch.f sub_hess_bend.f sub_getname.f sub_hess_tors.f sub_hess_imp_tors.f sub_pot_torsion.f sub_pot_imp_torsion_cvff.f sub_ewald_part.f sub_reciprocal_energy.f
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I can understand that the function pot_coulomb has been defined multiple number of times, but how do I know where (what those multiple files are)? It tells me the only place where I already know it is defined. Does this mean that somewhere in all the files that I have written, there is another definition of pot_coulomb ? (this would be very unlikely though, as each subroutine has its own file, and the corresponding file's name is the name of the function prefixed by "sub")Cant I get the names of all the places where its defined, so that I can look into this?
I am trying to setup Slacware 13.1 x86_64 to a encrypted partition. I used the README_CRYPT.TXT howto : [URL] At the step when I create an initrd.gz I get this error: Quote: ERROR: No /lib/modules/2.6.33.4-smp kernel modules tree found for kernel "2.6.33.4-smp"
I tried to look into the directory and there was only modules under 2.6.44.3. So I tried to change the command into: Quote: mkinitrd -c -k 2.6.33.4 -m ext3 -f ext3 -r cryptroot -C /dev/sda2
This command was successful, but I don't know if this is alright. I made the changes in lilo.conf, add initrd = initrd.gz. This is all on unencrypted /boot partition. The boot=/dev/sda1 I also set for the unencrypted boot partition. When I boot the system I get a kernel panic:
[Code]....
I am writing a kernel module which need to do something at some interval. Now this problem can be solved by using a user process, which will send signal to the kernel and the kernel would do accordingly. But it would be nice, i could do it within the kernel module itself. Is there any way to use SIGNALs inside the kernel module?
View 3 Replies View RelatedI was trying to install VirtualBox through the YaST > Software Management but it is not working, someone in the forum told me that I have to download the OSE version and do it manual way. Finally I am able to start up VB but not able to use the network connection. Thus I am trying to do this:
/etc/init.d/vboxdrv setup. I get this error:
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When I type dmesg, it shows me a bunch of info which I don't know what should look for. When I type modprobe vboxnetflt, I get the error: FATAL: Error inserting vboxnetflt (/lib/modules/2.6.37.1-1.2-default/updates/vboxnetflt.ko): Invalid module format. what should I do in order to get my VB to be able to connect to the internet?
I have an x86 pc and installed lucid these are the details of my distribution version:
I am trying to build a kernel module i am getting the following error:
How to build kernel modules
I need to debug "ls". I downloaded coreutils and compiled them in debug mode."ls" uses readdir() kernel API to fetch files/directories from a file system. readdir() fetch data from any file system (suppose FAT or ext3).I have debug version of FAT/ext3 and installed, I also have debug version of coreutils (ls) as well.Now I want to debug from "ls" to "FAT/ext3 readdir()".How to do that?
View 6 Replies View RelatedI have two modules A and B in the kernel which i am trying to hack by introducing a variable in A which is of type 'extern' (and using EXPORT_SYMBOL) and then calling it in B. Now the problem is how to introduce that variable in module A. Currently i have made a global variable and it works fine but global variable in kernel is a bad bad thing.
I tried having an 'extern' function in A which have that variable and calling that function in module B, but then again how would module A use my variable unless the variable is available outside the scope of that function and that again means a global variable.
I recently started having this odd behaviour while using and loading cpufrequtils on boot, I don't know if it is happening to someone else.During boot I'm getting( when /etc/init.d/cpufrequtils invokes /etc/init.d/loadcpufreq to load the proper module):
Loading cpufreq kernel modules...FATAL: Error inserting speedstep_centrino (/lib/modules/3.0.0-1-amd64/kernel/drivers/cpufreq/speedstep-centrino.ko): No such device
FATAL: Error inserting pcc_cpufreq (/lib/modules/3.0.0-1-amd64/kernel/drivers/cpufreq/pcc-cpufreq.ko): No such device
[code]....
Quote:
Originally Posted by anishakaul
When you copy paste the Makefile from post 7, make sure you delete the spaces shown in RED below by Backspace key and then press TAB
Code:
obj-m += hello.o
all:
........make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
........make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
how to write a device driver for USB
I am writing a device driver on x86 machine,Ubuntu distribution,kernel version 2.6.35.I want to debug my driver in kernel mode.I tried KGDB(Kernel Level Source Debugger).But support is given for kernel version 2.6.13.But I want to make KGDB work on version 2.6.35.Could anyone help me where can I get help to make KGDB work on 2.6.35 version?Or is there any other method to debug my driver using some other tool?
View 1 Replies View RelatedI did searched you tube but my results were not great.I have 2 books on KernelProgramming.I feel I need if some where I can get a video tutorial which can help me to understand how to develop a Linux Device driver that will be great.I had a look at Greg Kroah Hartmans video lecture of developing patches on ......I have been reading books and a lot of stuff.So I wish if I could get a video lecture that would be better
View 1 Replies View RelatedI write the network driver. Transmission of packets in user space I do through netlink socket`s. In user space there is a handling of packets and their transmission on other device (however, it isn't important).
Problem in that any time, packets through the driver in system, and is reverse, are transferred normally. But then there comes the moment when the kernel crash. If to look in syslog it seems to me that comes deadlock. Also I think that it is related with netlink socket`s.
I can't find the information on that anywhere how correctly to use netlink socket`s in kernel space. Can at you will any a reason into the account of synchronization of sockets and the driver in kernel space?
I can give the driver code if it is necessary.
How to do device driver programming in Ubuntu 10.04?
View 2 Replies View RelatedHow do you go about getting the raw size of a block device under Linux from within a C program? And I mean the raw size of the block device itself, not a file system that may or may not be installed on it. And I'd like to be able to get the raw size of any block device, from hard drives (e.g., /dev/sda) to LVM partitions (/dev/mapper/vg0-home) to loop devices to anything else that is a Linux block device.
View 3 Replies View RelatedI know, I know..."How long is a piece of string"?
I have one of these devices:
[URL]
Of course, it's Windows only, and XP only at that. However, the data that needs transferred between the device and the computer should be fairly basic, unless it offloads a lot of processing to the computer. I'm not a programmer, nor do I play one on TV, but I have written some fairly complicated microcontroller programs and some basic Java GUIs. Besides writing the actual code, how hard is it to do whatever needs done to make a Linux device driver, apart from the code to make the device work?
Is there an easy example of a block device driver I could follow as a guide to write my own module?
View 5 Replies View Relatedyou have to read from many devices separate devices and make it look like a single one. It sounds very much like a device driver to me, perhaps... but getting my hands dirty with kernel code sounds like a daunting task for me that I've never done it...
View 2 Replies View RelatedI've a problem with character device mounting. I've a character device module code. Here is the code
Code: /* chardev.c: Creates a read-only char device that says how many times
* you've read from the dev file
*/
#if defined(CONFIG_MODVERSIONS) && ! defined(MODVERSIONS)
#include <linux/modversions.h>
#define MODVERSIONS
[Code]...
I wrote a small hello world type of character device driver. When I type echo -n "abcdef" > /dev/bond and do a cat /dev/bond then only last "f" of above input abcdef is displayed rest nothing is displayed. I asked this question earlier and some people suggested me some modifications I have done and experimented all that but I am unable to catch the error.
Here is the code
Code:
/* Necessary includes for device drivers */
#include <linux/init.h>
//#include <linux/config.h>
#include <linux/module.h>
[Code].....
i woul like to know if i could get help in writing a charater device driver for communication between two pc's in linux using RS-232 serial port.
View 5 Replies View RelatedI have a user Application for transferring the data from one PC to the other PC using Ethernet Port, can we create a device driver for that ?? that means it should act like a virtual device, if we write data into /dev/some file, it should go the other PC
View 3 Replies View RelatedI had return a driver for receiving and transmitting packets for the ethernet controller named rtl8139.I want to test it by writing an application program (socket programming).But I am unable to link it with the interface. Can anyone help in this regard?
View 1 Replies View RelatedI installed openSUSE 11.2 on virtualbox. My host is windows 7. I tried to install the guest additions, but i get an error saying
Code:
Building VirtualBox Guest Additions Kernel Modules...Failed
(Your system does not seem to be set up to build kernel modules)
How should i go about to let my system build kernel modules?
all i want is loading a simple c++ program like hello world with this driver. everything works fine except it doesnt start the program. because ret returns with 0 i think the program works fine but I think i messed up something about how to start the c++ program. i used this example for my program but it doesent work too.
[URL]
is there anybody out there who can give me a hint what i messed up? i use ubuntu with 2.6.32 Kernel.
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The case is that I've got 2 harddisks. On the one windows xp(slave) - and on the other one ubuntu (master). During the boot I get these errors...
"Gave up waiting for boot device"
"Boot args(cat /proc/cmdline)"
"Missing modules (cat /proc/modules; 1s , dev)"
"/dev/disk/by-uuid/f96603ce - does not exist"
These problems occured because of this:
After using ubuntu I tried to reset my bios, because else it couldn't have found the disk with xp. And I didn't disconnect the disk with xp while resetting the bios. And now the system can't find the disk with xp any more when booting. Is there a way to finding the disk..? And I'm in doubt about IF I've resetted the bios at all. I miss a manual for PCCHIPS M851. May be it can take 20 minutes for the bios to be resetted? The shop where I bought the motherboard doesn't exist any more... and don't know the manufacturer. Could I damage the motherboard if I tried rebooting lots of times to get it work?
I am trying to write kernel modules. And am running Ubuntu 10.04 x64. I have downloaded both kernel source and headers. Unpacked kernel source and made a /usr/src/linux symbolic link pointing to the src. Here is the output of running make:
Code:
make -C /lib/modules/2.6.32-22-generic/build M= modules
make[1]: Entering directory `/usr/src/linux-headers-2.6.32-22-generic'
CHK include/linux/version.h
CHK include/linux/utsrelease.h
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I am taking both the module and the Makefile from Linux Kernel Module Programming Guide book. I don't know what am missing.
I have just compiled a new kernel. When I boot into this new kernel and do an lsmod it is only running two modules. The only thing I changed in the configuration file was to compile ext4 file system into the kernel. My computer is an HP Pavilion dv4. The two modules are lirc_ene0100 and lirc_dev. I am running Ubuntu 10.04. The new kernel is 2.6.32.15+drm33.5. The kernel seems to work fine but I need to know why and how it can only be running two modules.
View 1 Replies View RelatedI am looking for a vps that I can run my own kernel and install modules in.
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