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Thread: Knoppix 7.2 takes too long to boot from .ISO in USB flash disk with Grub4dos

  1. #1
    Junior Member
    Join Date
    Jun 2012
    Posts
    3

    Knoppix 7.2 takes too long to boot from .ISO in USB flash disk with Grub4dos

    Hi.
    I'm a happy Knoppix newbie, but I think that the boot time can be improved.
    I boot Knoppix from its .ISO image file in a folder of an USB flash disk with Grub4dos.
    This is the Knoppix entry in menu.lst:

    title Knoppix 7.2 Lnx 32b (fom ISO)
    find --set-root /iso/ADRIANE-KNOPPIX_V7.2.0CD-2013-06-16-EN.iso
    map --heads=0 --sectors-per-track=0 /iso/ADRIANE-KNOPPIX_V7.2.0CD-2013-06-16-EN.iso (0xff)
    map --hook
    root (0xff)
    kernel /boot/isolinux/linux ramdisk_size=100000 init=/etc/init apm=power-off nodma vga=normal nomce lang=es keyboard=es xkeyboard=es BOOT_IMAGE=knoppix bootfrom=/.//iso/ADRIANE-KNOPPIX_V7.2.0CD-2013-06-16-EN.iso noprompt
    initrd /boot/isolinux/minirt.gz
    boot

    Knoppix boots well, and it does it faster than Windows, but, while booting, it stops for several seconds sarching for Knoppix filesystem, showing this message:
    "Cannot find Knoppix dir in ISO file /.//iso/ADRIANE-KNOPPIX_V7.2.0CD-2013-06-16-EN.iso"
    It obviously refers to the bootfrom= param in the kernel line.
    It tries several times all the drives and partitions until it finally boots saying something like: found ISO in /dev/sdb1/mnt-iso/iso/ADRIANE-KNOPPIX_...
    After adding the param nodma to the kernel line, it booted fine the first time, bot not always does it.
    If I just change the bootfrom= param to /iso/ADRIANE-KNOPPIX_... (instead of /.//iso/ADRIANE-KNOPPIX_...), it gets worse.
    I hope this issue can be improved soon.
    Best regards.

  2. #2
    Moderator Moderator
    Join Date
    Nov 2010
    Location
    Germany/ Dietzenbach
    Posts
    1,124
    bootfrom=/.//iso/ADRIANE-KNOPPIX_....

    This cannot work. Did you try

    bootfrom=/dev/sdb1/mnt-iso/iso/ADRIANE-KNOPPIX_...

  3. #3
    Junior Member
    Join Date
    Jun 2012
    Posts
    3
    Quote Originally Posted by Werner P. Schulz View Post
    bootfrom=/.//iso/ADRIANE-KNOPPIX_.... This cannot work. Did you try bootfrom=/dev/sdb1/mnt-iso/iso/ADRIANE-KNOPPIX_...
    Thank you, Werner, but I not always boot from sdb1. The line that I posted works fine, but I want to share with you all what I found out. The speed of the search for the iso is notably increased (and thus the boot time is greatly decreased) if I press the [CONTROL] key when it is performed. I don't know whay, but it works for me. So, this is an important update about this issue. Best regards.

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