Re: Next steps

Re: Next steps

[Mark Chambers]

Bob,

I would definitely recommend NFS.  As Bob White pointed out, you can get a
directory structure all set up from eldk.  The thing about NFS is you have a
PC with visual tools and all to mess with the same files that your embedded
system is accessing.  Plus of course you have much more file space.  And if
you're new to Linux it's a whole lot easier to get up to speed on the PC.

dhcp & bootp are really different things from NFS, although I think you have
to enable them in the [embedded] kernel for nfsboot to work.  But you
probably want to set your board up with a fixed IP and compressed kernel (or
tftp it in) from u-boot, just feeding a command line to the kernel that
tells it the root is nfs something.  No sense adding more complexity than
you need!

When it comes to stand-alone booting of an embedded system you can also
consider jffs2 or cramfs instead of initrd.  (I can tell you more if you're
interested).

Mark Chambers
WV Computronics


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Re: Simple module, but won't build

[Wolfgang Denk]

In message <20040504211508.GA2510@mars.ravnborg.org> you wrote:
>
> make -C $KERNELSRCDIR SUBDIRS=$PWD modules
>
> This should give you the correct gcc options.
>
> [Speaking of vanilla kernel, not knowing ELDK in this respect].

Same for ELDK. We use a standard Linux kernel,  too  [just  some  bug
fixes and extensions included].

Best regards,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
"It's when they say 2 + 2 = 5 that I begin to argue."    - Eric Pepke

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Next steps

[Brian Hawley]

We've finally gotten the 2.5 kernel to boot using u-boot [ 2.6.3 doesn't,
nor did 2.4 variants ] on a PPC440GP
on the Ebony board.

At this point, it is trying to talk to a dhcp/bootp server and get a NFS
root filesystem.

Eventually, we'll be porting this to a custom board with some other chip
set support on it.

Our application will essentially be data acquisition and
transmission.  We'll be talking to the chipset to
suck data off [ and push data ] and on the other side push/pull data from
the PCI bus.

Linux is probably overkill for this, but we wanted a development platform
we could extend in the future
more readily.

I'm curious as to the direction people think we should take at this
point.  Should we be trying to set up
a root NFS filesystem [ presumably because it is easier to change -- and
then moving it to an initrd ? ]?

What do we need on the NFS filesystem...

What resources can you point me to to help us make the transition to the
next level.

Any help is appreciated,

Thanks.

-- Brian

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Re: Next steps

[Bob White]

> I'm curious as to the direction people think we should take at this
> point.  Should we be trying to set up
> a root NFS filesystem [ presumably because it is easier to change -- and
> then moving it to an initrd ? ]?
>
> What do we need on the NFS filesystem...
>

Are you using the ELDK?  Have you seen:

http://www.denx.de/twiki/bin/view/DULG/ELDKMountingTargetComponentsViaNF
S

Bob
--
Robert B. White        Perigee, A Division of Sensis Corp
Software Design Engr   316 Commerce Blvd.
TEL: 315.453.7842x29   Liverpool, NY  13088
FAX: 315.453.7917      www.Perigee.com


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