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Thread: 32 bit or 64 bit

  1. #1
    Member registered user
    Join Date
    Dec 2006
    Posts
    40

    32 bit or 64 bit

    I have a 64-bit processor on a Dell 9360 machine.
    If I boot into Knoppix 8.2.0 Live from a portable drive and run simple queries as follows I get:
    $ lscpu
    Architecture: x86_64
    CPU op-mode(s): 32 bit,64 bit
    Flags: ... lm ...
    $ lshw -C processor | grep width
    width: 64 bits
    $ grep flags /proc/cpuinfo | grep " lm "
    Flags: ... lm ...

    which all confirm the 64-bit architecture. BUT the response
    CPU op-mode(s): 32 bit,64 bit
    apparently indicates that I am running a 64-bit-capable machine in 32-bit-mode.
    Yes? - is this a true interpretation?
    My /boot/isolinux/isolinux.cfg file contains the lines (omitting redundant qualifiers for ease of reading)
    DEFAULT fergus
    LABEL fergus
    KERNEL ifcpu64.c32
    APPEND knoppix64 -- knoppix
    APPEND knoppix64
    LABEL knoppix
    KERNEL linux
    APPEND initrd=minirt.gz
    LABEL knoppix64
    KERNEL linux64
    APPEND initrd=minirt.gz

    which I hoped meant "if 64-bit machine use 64-bit OS; if 32-bit machine use 32-bit OS" but apparently not.
    How can I tweak the isolinux.cfg file to behave as required one line up?
    Thank you!
    PS1 I have to admit (I have only just noticed) that the file ifcpu64.c32 referred to above is very suggestive of an instruction "if 64-bit machine use 32-bit OS". Is that what it achieves, and the cause of the mismatch described?
    PS2 I use this ifcpu file from the Knoppix 7.4.2 provision. I find the Knoppix 8.2.0 version stops Knoppix stone dead before it even starts. It simply does not work, at all. Anybody else?

  2. #2
    Junior Member
    Join Date
    Jun 2012
    Posts
    23
    Check out the Cheat Codes for optional bootup switches.

    http://knoppix.net/wiki/Cheat_Codes

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