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    SubjectRe: How to Switch DMA off for only one Harddisk at Kernelboot
    Hi Gabriel!

    Sunday 16, at 09:31:17 PM you wrote:

    > Oliver Joa wrote:
    > > Hi,
    > >
    > > Gabriel C wrote:
    > >
    > > [...]
    > >
    > >>>> Also have a look at Documentation/ide.txt.
    > >>> I read this already. Searching for "nodma" in this document gives only
    > >>> one line:
    > >>>
    > >>> "ide=nodma" : disable DMA globally for the IDE subsystem.
    > >>>
    > >>> If the documentation is correct hda=nodma and ideX=nodma should not
    > >>> work. I use kernel 2.6.23.1 at the moment.
    > >> grep nodma Documentation/ide.txt
    > >> "hdx=nodma" : disallow DMA
    > >>
    > >> ide=foo_option is for the whole ide sub-system where ideX|hdX=foo_option is just for that HDD.
    > >
    > >
    > > /usr/src/linux-2.6.23.1$ grep nodma Documentation/ide.txt
    > > "ide=nodma" : disable DMA globally for the IDE subsystem.
    > >
    > > /usr/src/linux-2.6.21.5$ grep nodma Documentation/ide.txt
    > > "ide=nodma" : disable DMA globally for the IDE subsystem.
    > >
    > > /usr/src/linux-2.6.12# grep nodma Documentation/ide.txt
    > > "ide=nodma" : disable DMA globally for the IDE subsystem.
    > >
    > > Sorry, but I can not find this option, and it does not work. Which
    > > kernel do you use?
    >
    > This is my devel box , running 2.6.24-rc5-git
    Are you using modular or in-kernel IDE? Modules ignore cmdline options, so
    you must pass this parameter directly to ide_core (e.g. ide_core
    options="ide=nodma").

    --
    WBR et al.


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