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    From
    SubjectRe: HELP: Linux replacement for "DOS diagnostic" station
    Date
    Followup to:  <404CFF03.1090601@techsource.com>
    By author: Timothy Miller <miller@techsource.com>
    In newsgroup: linux.dev.kernel
    >
    > So, first of all, we need to make /dev/mem accessible to all users.
    > Secondly, we need some mechanism to access I/O and config space, but it
    > can be indirect through ioctl.
    >
    > Is there a driver for Linux which supports I/O and config space access
    > for user-space programs in a completely generic way?
    >

    Just use iopl(3) and do the accesses directly from userspace, or use
    /dev/port.

    -hpa
    -
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