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Forum: Kernel

Request help with Linux kernel compilation, theory, programming, or other kernel related issues

  1. Blackstart Screen

    Hello, When I start my patched kernel from Ubuntu/Grub I get only a blackscreen. I get no messages about the system state. Is it possible to force...

    Started by flam, 03-08-2010
    • Replies: 8
    • Views: 1,306
    03-13-2010 Go to last post
  2. bitops.h inline and extern has different names

    Hi all! I'm writing a LKM for my ARM/Linux 2.4.27 based server. I have downloaded the matching kernel code and also built my own armv5b GCC...

    Started by matska, 03-08-2010
    • Replies: 2
    • Views: 883
    03-12-2010 Go to last post
  3. Driver and IOCTL

    Hi, I have two queries related to driver and IOCTL.... 1. What is the difference between user space driver and kernel space driver 2. Can we...

    Started by kulkarnispavan, 07-23-2009
    • Replies: 3
    • Views: 3,646
    03-11-2010 Go to last post
  4. Exclamation Linux kernel 2.6.32 failed to fork() in LTP test msgctl11. Any ideas?

    System: ARM11, total memory is 240956K, Linux kernel 2.6.32. Problem: LTP test msgctl11 failed to fork() in Linux kernel 2.6.32 with the...

    Started by bigwood, 03-10-2010
    • Replies: 0
    • Views: 2,015
    03-10-2010 Go to last post
  5. VmRSS increases but VmData does not

    I have written one sample code where I allocate memory and then free it. What I observed was whenever allocation was done, VmData is increased....

    Started by pmurthy, 03-10-2010
    • Replies: 0
    • Views: 3,149
    03-10-2010 Go to last post
  6. Understanding /proc/diskstats...

    Hello, I am trying to understand the figures in /proc/diskstats but I seem to be missing something fundamental. I wanted to see the read and...

    Started by manemannen, 03-10-2010
    • Replies: 0
    • Views: 4,317
    03-10-2010 Go to last post
  7. Device driver programming

    hi, i have a homework, writing device driver for linux. i decided to write for my mp3 player , usb device. i really dont know where should i begin...

    Started by eladriels, 03-08-2010
    • Replies: 1
    • Views: 1,090
    oz
    03-08-2010 Go to last post
  8. [SOLVED] RTAI patched kernel compiling irq error

    Hello, I've a problem with compiling an patched kernel. I patched the kernel 2.6.31.8 with rtai-3.8. To patch the kernel is no problem. But even I...

    Started by flam, 03-06-2010
    • Replies: 2
    • Views: 3,868
    03-08-2010 Go to last post
  9. Allocate and use DMA buffer

    Hi, I have a question about DMA buffers. I am writing a device driver which should use DMA transfer from device to host PC memory. I allocate a DMA...

    Started by orback, 03-08-2010
    • Replies: 0
    • Views: 1,781
    03-08-2010 Go to last post
  10. Building new Linux distribution.. where to go?

    Hey guys. I am looking forward to building a Linux distribution that is made extremely custom to my ideas of how an OS should run. (I have some...

    Started by LiteHacker, 03-05-2010
    • Replies: 6
    • Views: 15,113
    03-07-2010 Go to last post
  11. Question Safe to use Magic SysRq for shutdown?

    Is it safe to use the "REISUB" or similar sequence to shut down a system that has not crashed, if you need it shut off as fast as possible? My UPS...

    Started by HyperHacker, 03-06-2010
    • Replies: 0
    • Views: 1,003
    03-06-2010 Go to last post
  12. what is functionality of read_write.c

    i wanted to know the functionality of read_write.c and the system call vfs_write. are these used when we do a paste or ctrl-v or something like...

    Started by ramyayella, 03-05-2010
    • Replies: 3
    • Views: 1,182
    03-05-2010 Go to last post
  13. Post virtual filesystem

    Hi, I am working on virtual file system in the kernel, my requirement is I want add some more header information to the file when the data is...

    Started by bhanuprakash, 03-02-2010
    • Replies: 2
    • Views: 570
    03-05-2010 Go to last post
  14. USB mass storage disconnected randomly (due to EMI?).

    Hi all, This is my first post in this forum - I hope I am in the right place. Here is the issue that I am facing. On my computer (than runs...

    Started by julieng, 03-01-2010
    • Replies: 3
    • Views: 3,688
    03-04-2010 Go to last post
  15. Question sendfile usage for udp

    Hi, I have been trying to use sendfile system call for transferring data for a udp connection. This option was available only for tcp...

    Started by suhashgd, 03-04-2010
    • Replies: 0
    • Views: 1,723
    03-04-2010 Go to last post
  16. New DEFINEs in include/linux/sched.h not found

    I've been asked to build a new linux kernel that has fair group sharing (yes, it is implemented in newer kernel versions already, but I'm going to...

    Started by Elleroth, 03-01-2010
    • Replies: 2
    • Views: 1,498
    03-03-2010 Go to last post
  17. Specifying the Cache replacement policy of L2

    Hello, Please, is t possible to specify the cache replacement policy in linux or is that a hardware embedded option. I need that for some...

    Started by nytty, 03-03-2010
    • Replies: 0
    • Views: 561
    03-03-2010 Go to last post
  18. What happens in the installation of .deb file?

    Hi! I want to know what happens when we install a .deb file? Using gdebi,we can find the list of files included in the "Included Files" tab. When...

    Started by kapmsd, 02-28-2010
    • Replies: 2
    • Views: 711
    02-28-2010 Go to last post
  19. Filename in Kernel Module file_operations.read

    I'm writing a kernel module that will create a directory in /proc and will dynamically create a set of files based on parameters passed in when the...

    Started by jdparent, 02-26-2010
    • Replies: 1
    • Views: 2,303
    02-26-2010 Go to last post
  20. Is it safe to use copy_to_user on a __iomem pointer returned by ioremap?

    Hi, I am currently writing a device driver and i wounder if it is safe to use copy_to_user on an __iomem pointer return by ioremap()? Or do I have...

    Started by orback, 02-25-2010
    • Replies: 1
    • Views: 1,629
    02-26-2010 Go to last post

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