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    SubjectRe: linux kernel without file system
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    Oh yes sorry, I mixed that with the dev entry in sysfs, which contains
    the device major:minor in textual form (e.g. /sys/block/fd0/dev).
    Confused memory ...

    Xav

    On Wed, 2009-01-14 at 11:34 +0100, Kay Sievers wrote:
    > On Wed, Jan 14, 2009 at 10:52, Xavier Bestel <xavier.bestel@free.fr> wrote:
    > > On Wed, 2009-01-14 at 10:34 +0100, Philippe De Muyter wrote:
    > >> On Wed, Jan 14, 2009 at 09:46:48AM +0100, Tomasz Chmielewski wrote:
    > >> >> I need to design a very small embedded system that must only control
    > >> >> one ethernet port and two serial lines and must fit in a very small flash
    > >> >> memory. So I thought about replacing the call to /etc/init by my
    > >> >> application
    > >> >> program and removing all the file-system part of linux.
    > >> >> Is that doable ?
    > >> >> Is there a 'standard' way of doing that ?
    > >> >> The first problem I see is accessing my serial lines. How could I do that
    > >> >> without using open("/dev/ttySx"), which requires a file system ?
    > >> >> Is there a way to access devices that does not require a file-system ?
    > >> >
    > >> > You could put everything in initramfs (and embed it in the kernel).
    > >>
    > >> Actually, I was thinking about reducing the footprint of my kernel by
    > >> removing all the fs-related system calls, so the problem is not where
    > >> the file-system is, but how to access (serial) devices without giving their
    > >> "/dev/..." name.
    > >
    > > You can still mount sysfs somewhere and access the device nodes from
    > > there.
    >
    > There are no device nodes in sysfs to talk to the device, only
    > attributes, which are mostly plain small text files. For some devices
    > there are a few writable and mappable files which can change the
    > device's state, but that's nothing like a device node.
    >
    > Kay
    >




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