Subject: Re: linux kernel without file system
From: Xavier Bestel <xavier.bestel@free.fr>
To: Philippe De Muyter <phdm@macqel.be>
Cc: Tomasz Chmielewski <mangoo@wpkg.org>, LKML <linux-kernel@vger.kernel.org>
In-Reply-To: <20090114093422.GA9771@frolo.macqel>
References: <496DA678.1090701@wpkg.org> <20090114093422.GA9771@frolo.macqel>
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Date: Wed, 14 Jan 2009 10:52:24 +0100
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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.

	Xav


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