Recent content by chaotix

  1. chaotix

    Release Ubuntu 12.04 LTS on SD card

    Yes, I tried to keep all changes in a single directory. I chose /etc/pandora for that. Nearly everything else is a symlink in this directory (except stuff under /etc/sudoers.d/ which does not accept symlinks). The problem with the current image is that it includes the kernel modules from the...
  2. chaotix

    Release Ubuntu 12.04 LTS on SD card

    Thanks for writing that down. The kernel location has changed with the latest firmware causing the original boot.txt to fail. Also a kernel problem. As the kernel changed new modules are needed. I don't know when I will get around to updating the image, but I guess you should be able to get it...
  3. chaotix

    Is it possible to associate .xls with Libre Office in Pandebian?

    I don't know about PanDebian, but I know it's possible with a Debian installation with schroot. http://lxtek.de/pandora/schroot/
  4. chaotix

    Release P-Boot

    Did you get to the P-Boot menu? Did you select a boot entry? What's in the associated config file? What's in the global config file? A couple of lines of output (maybe a picture of the screen) where it hangs would be helpful. If you know your way around a shell and you did get to the P-Boot...
  5. chaotix

    Release P-Boot

    Glad to hear that you could get it to work. You could mount an ISO-image and boot from it. But as ISO-images are read-only this would only make any sense for specially crafted images that are the equivalent of Live-CDs for the Pandora. I'm not aware that anything like this exists. But you...
  6. chaotix

    Formatting a SD card : demystifying !

    Yes, but I think this is only relevant for FAT filesystems. Although I would be interested in a benchmark if this really does make a difference. Here is a description how to align a FAT filesystem: http://www.patriotme...21383#post21383 I found several mentions of using stride and...
  7. chaotix

    Release P-Boot

    Yes. That should be possible. You can specify the modules you need in a pboot.cfg.d/usb.conf file. I don't know exactly which modules you need. You will need at least ehci_hcd. The rest might get loaded automatically. If not usb_storage is needed and possibly sg. So to be on the safe side...
  8. chaotix

    Release P-Boot

    http://lxtek.de/pandora/pboot/ While trying to get Ubuntu to work I felt that it would be nice to have more flexible booting options. So I patched together an Initramfs that presents you a boot menu and allows you to boot from NFS, loopfiles, loopfiles from NFS (if your really feel the need to...
  9. chaotix

    Filesystem shootout

    You don't have to run it in a Debian chroot anymore. I put up instructions on http://lxtek.de/pand...nchmark/bonnie/ on how to reproduce the test with minimal fuss. (It might be helpful to uncomment the BLOCKS=2000000 line as I had some trouble on the last test with mkfs.vfat not detecting the...
  10. chaotix

    Filesystem shootout

    I got a new card (SanDisk Mobile Ultra 16GB microSDHC Class 10) and repeated the testing procedures. The new card was the slowest on block output, but the fastest in every other test. Interestingly the card was also not affected by partition alignment performance issues. I still aligned the...
  11. chaotix

    Formatting a SD card : demystifying !

    OK, I did this now. (I did not run step 1 as the card was new.) And the result shows there are no performance differences between running bonnie before filling the whole card and then running it again after I filled the whole partition. This implies that running the official formatter does...
  12. chaotix

    Formatting a SD card : demystifying !

    I just bought a SanDisk Ultra Class 10 microSDHC card and am running some benchmarks now. Ah. Did not see that in your first post. You did not give the -u option to fdisk. That's the same partition layout. The first one reports values in an ancient DOS compatibility mode which uses CHS...
  13. chaotix

    Formatting a SD card : demystifying !

    I would use flashbench (http://lxtek.de/pandora/flashbench) to test what erase block size the card has and then partition it accordingly. If the results are inconclusive I would write several GB of data to the card and try it again. If that is too much work, I guess 16MB is a safe size.
  14. chaotix

    Formatting a SD card : demystifying !

    Block output is slower than in my tests for ext4, but that's probably just the write speed of your card. I don't think it has anything to do with partition alignment. "dirsync" explains the slow create and delete operations which are about at the same level as the tests I did. So it seems...
  15. chaotix

    Formatting a SD card : demystifying !

    What filesystem and mount options did you use? (mount | grep mmcblk)
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