[ELDK] SNMP for ppc8xx w/very little flash

[Eran Duchan]

For google posterity, I'm attaching a short blog post I wrote ("Compiling
Net-SNMP for Embedded Linux with
ELDK<http://www.pavius.net/2011/02/compiling-net-snmp-for-embedded-linux-using-the-eldk/>")
regarding
how to compile the latest net-snmp version (5.6.1) with the ELDK - it's easy
to compile and runs great. An agent supporting V2 and V3 with authentication
and encryption takes around ~1MB of flash with this
configuration.

I was able to recompile the version using the source RPMs, but opted to use
the latest version instead.

Thanks for the pointers
Eran

On Sun, Jan 2, 2011 at 1:33 PM, Eran Duchan <pavius at gmail.com> wrote:

> Hi Wolfgang,
>
> Thanks for the reply.
>
> > there might be better options than JFFS2...
> Yep, it was a choice of convenience and not something that will roll out
> just yet. Regardless of choice, this specific board will be very tight on
> flash space.
>
> >  it has never been a good idea to install complete packages with all the
> (potention) dependencies these may pull in
> > If you know what you need and pick exactly the needed files only
> the result may be different
> What I tried to do was rather start from snmpd and work from there (by
> running it on the target and seeing what it was yelling about). Is there a
> more intelligent way of doing this (and therefore allowing customization)?
> My understanding is that the eldk has a compiled with such and such MIBs and
> such and such dependencies - take it as a whole or leave it. Am I wrong?
>
> > [compiling net-snmp] you don;t want to install the whole packages
> either.
> Of course, from source I can leave out much functionality that i don't
> require (v3, for example and support for MIBs other than the absolute
> basic).
>
> Thanks!
> Eran
>
> On Sun, Jan 2, 2011 at 8:31 AM, Wolfgang Denk <wd at denx.de> wrote:
>
>> Dear Eran Duchan,
>>
>> In message <AANLkTi=OCdAD2TNV1A+WzVJyrRgPqn+5hTCVjwr34dHy at mail.gmail.com>
>> you wrote:
>> >
>> > I've ported u-boot and linux 2.6 to a custom ppc8xx based board and
>> > everything runs fine. I am using a jffs2 image based on the SELF
>> ramdisk,
>> > and have about 1.5 megs of free space on this device.
>>
>> Depending on your requirements (partition size, need for a writable
>> file system etc.) there might be better options than JFFS2...
>>
>> > I'd like to add an SNMP agent, supporting very few standard MIBs (core
>> would
>> > suffice). I understand that the eldk has an SNMP package, but for some
>> > reason it seems to pull in a lot of libraries (librpm, for example?). In
>>
>> Well, for a resource-restricted embedded system it has never been a
>> good idea to install complete packages with all the (potention)
>> dependencies these may pull in.  Just install the tools you really
>> need.
>>
>> > addition, its MIB library is 2 megs so it's pretty much out of the
>> question.
>> >
>> > Therefore:
>> > 1) Am I right to assume that I can't use the SNMP package from the eldk
>> in
>> > my case?
>>
>> Probably not - when you insist on installing whole packages (which
>> makes little or no sense on a resource-restricted system.
>>
>> If you know what you need and pick exactly the needed files only the
>> result may be different.
>>
>> > 2) Is my only course of action compiling net-snmp using eldk,
>> > following the net-snmp
>> > faq <http://www.net-snmp.org/wiki/index.php/FAQ:Compiling_04> regarding
>> > reducing footprint?
>>
>> This is always an option - but even then, you don;t want to install
>> the whole packages either.
>>
>> Best regards,
>>
>> Wolfgang Denk
>>
>> --
>> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
>> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
>> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
>> Any technology distinguishable from magic is insufficiently advanced.
>>
>
>