[Battlemesh] [OpenWrt-Users] wshaper equivalent and smaller - (making the firmware smaller)
Ben West
ben at gowasabi.net
Wed Oct 16 15:52:51 UTC 2013
Inline below ...
On Tue, Oct 15, 2013 at 7:42 PM, cmsv <cmsv at wirelesspt.net> wrote:
>
>
> On 10/14/2013 05:45 PM, Ben West wrote:
> > Hi cmsv,
> >
> > I can confirm that disabling "Remove ipkg/opkg status data files in
> > final images" does indeed interfere with sysupgrade's ability to collect
> > and preserve relevant config data. I've not found this option to save
> > much space in the final squashfs image, at least not enough to justify
> > the hassle.
> >
> > Besides that, I've been using wpad-mini for psk2 IBSS-RSN just fine on
> > atheros devices and ar71xx devices (specifically UBNT Nanostations and
> > TP-Link MR-3020's). This is working for me on AA r36669 and now also AA
> > r38347, albeit with the beacon_int patch on the latter, mentioned recent
> > threads.
>
> I confirmed that beacon_int functionality is working.
> Can you confirm that wpad-mini is working for adhoc using batman-adv ?
>
I use olsrd, so no easy way for me to verify batman-adv operation. wpad
and wpad-mini do operate independently of routing and addressing schema,
although I realize that batman-adv also operates at layer 2.
> >
> > Also, I do configure /etc/config/wireless using vi, rather than via luci.
> >
> > Space-saving tips:
> >
> > * Enable General Settings -> Optimize for Size in kernel_menuconfig
> > (may be enabled by default).
> > * Disable IPv6 if you don't need it.
> The only reason why i still keep some ipv6 support is due to A.L.F.R.E.D
> for batman-adv. The mesh is ipv4 and i wonder how much ipv6 support the
> packages need to have to be able to work with A.L.F.R.E.D.
> Any feedback is welcome.
>
> > * Disable USB and autofs4 support if you don't need them.
> > * Try wpad-mini instead of wpad.
> > * In Global Build Settings, disable "Compile packages with debugging
> > info" and "Compile the kernel with Debug FileSystem enabled."
>
> > * In Advanced Configuration -> Target Options -> Target Optimizations,
> > add the flag "-funit-at-a-time" to tell GCC to work harder at size
> > optimization.
> > * If you need SSL support, i.e. for curl, patch libcurl to use the
> > latest version of cyassl or polarssl instead of openssl.
> Only for dropbear at the moment. Any alternative?
>
Dropbear as packaged with AA doesn't have any dependency on openssl:
https://dev.openwrt.org/browser/branches/attitude_adjustment/package/dropbear/Makefile
I've been using dropbear just fine w/o openssl. What is the openssl
dependency that you require?
> >
> >
> >
> >
> > On Sat, Oct 12, 2013 at 11:36 AM, cmsv <cmsv at wirelesspt.net
> > <mailto:cmsv at wirelesspt.net>> wrote:
> >
> >
> >
> > On 10/08/2013 05:47 AM, Pau wrote:
> > > Another trick is to disable "opkg" since (probably) you are not
> gonna
> > > use it if the flash memory is so small.
> >
> > I have thought about removing opkg but there are some optional
> packages
> > that are provided and quite useful for certain situations. what other
> > method could it be used to install a package ?
> > wget get can fetch but what is the mechanism that is used by opkg ?
> >
> > for example removing
> > [ ] Remove ipkg/opkg status data files in final images
> > also helps but seems to break the possibility of installing an
> upgrade
> > package or a package. Am i correct ?
> >
> > I also wondered if it is a good or bad idea to remove:
> > [*] Compile the kernel with Debug FileSystem enabled
> > > --
> > > ./p4u
> > >
> > >
> > > On Tue, Oct 8, 2013 at 11:39 AM, Bastian Bittorf
> > <bittorf at bluebottle.com <mailto:bittorf at bluebottle.com>> wrote:
> > >> * cmsv <cmsv at wirelesspt.net <mailto:cmsv at wirelesspt.net>>
> > [08.10.2013 10:45]:
> > >>> Total: 169.8 KB
> > >>>
> > >>> Does anyone uses, recommend or know about a smaller equivalent
> > script or
> > >>> package ?
> > >>
> > >> there are a lot of things where can screw to get your image
> smaller.
> > >>
> > >> first do this:
> > >> disbale debugging stuff in 'make menuconfig'
> > >> -> Global build settings
> > >> -> [ ] Compile the kernel with symbol table information
> > done
> > >>
> > >> (you can even disable wireless-debug for your driver)
> > Has been considered.
> >
> > >>
> > >> additionally, ou can disable printk and swap, which saves ~100k:
> > >>
> > >> make kernel_menuconfig
> > >> -> General setup
> > >> [ ] Support for paging of anonymous memory (swap)
> > done
> > >> -> Configure standard kernel features (expert users)
> > >> [ ] Enable support for printk
> > done
> > what exactly is printk most useful for ?
> > >>
> > >> let us know, if it helps. for 4mb routers, the image
> > >> should not exceed 3.6mb
> > right now and for my testing model:
> > 3.8M openwrt-ar71xx-generic-dir-615-c1-squashfs-factory.bin
> > 3.2M openwrt-ar71xx-generic-dir-615-c1-squashfs-sysupgrade.bin
> > (includes some extra needed packages and scrips)
> >
> > What other things could be removed without hurting the needed
> > functionality for a batman-adv atheros only based firmware with an
> > average of 400mhz cpu, 32mb ram and 4 mb flash.
> >
> > Although the sysupgrade for my tetsing model is 3.2mb; for other
> > brands/models it goes slightly bigger last time i checked.
> >
> > One other package that is using twice the size that it needs to use
> is
> > wpad which i have to use if i want ad-hoc to function with psk
> > encryption. I am not able to use the wpad-mini package which is half
> the
> > size of wpad pad due to this:
> >
> > http://rooter.kyberian.net/tag/adhoc
> >
> > and batman-adv is not able to communicate with other nodes if the
> > firmware uses wpad-mini.
> >
> > I believe that there might be a patch out there but unsure about it
> or
> > if it has been added to AA.
> >
> >
> > >>
> > >> bye, bastian
> > >> _______________________________________________
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> > >> Battlemesh at ml.ninux.org <mailto:Battlemesh at ml.ninux.org>
> > >> http://ml.ninux.org/mailman/listinfo/battlemesh
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> > >
> >
> >
> > _______________________________________________
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> >
> >
> >
> >
> > --
> > Ben West
> > http://gowasabi.net
> > ben at gowasabi.net <mailto:ben at gowasabi.net>
> > 314-246-9434
>
--
Ben West
http://gowasabi.net
ben at gowasabi.net
314-246-9434
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