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    SubjectRe: AMD64: 64 bit kernel 32 bit userland - some pending questions
    Thomas Glanzmann <> writes:

    > Hello everyone,
    > I would like to use an AMD64 Opteron System with a 64 bit Linux Kernel,
    > but a 32 bit userland (Debian Sarge). I have a few questions about this:

    The main caveat is that iptables and ipsec need 64bit executables
    to be set up. The rest should work.

    > - Is it possible to give the userland 3Gbyte virtual address
    > space (default for 2.4 and 2.6).

    The default is 4GB, but you can get 3GB by running it under linux32 --3gb

    > But give the Kernel a 64 bit
    > virtual address space so that I get more than 1 Gbyte physical
    > Memory into LOWMEM - say I want 8 Gbyte - without using HIGHMEM

    The 64bit kernel never uses highmem.

    > - What is the easiest way to build a 64 bit kernel on a 32 bit
    > Debian sarge. Are there crosscompiler packages available? Are
    > there any guides on this?

    If all fails you can get a cross compiler from crosstool.
    Then normal kernel compilation command with

    make ... ARCH=x86_64 CROSS_COMPILE=x86_64-linux-

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      Last update: 2006-06-06 12:45    [W:0.019 / U:42.784 seconds]
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