[OpenWrt-Devel] Reducing the root file system in openwrt

[Ronaldo Afonso]

  Arjav,

  I'm not 100% sure of that, but if I were you I would take a look at the
Makefiles that generate those packages whose files you don't want to be
included in the final build image.

  Often the "install" directive of an OpenWrt Makefile is where developers
"include" the files they want to be include in the final image.

  Here is an example of libbz2 package:

 77 define Package/libbz2/install
 78     $(INSTALL_DIR) $(1)/usr/lib/
 79     $(CP) $(PKG_BUILD_DIR)/libbz2.so.$(PKG_VERSION) $(1)/usr/lib/
 80     $(LN) libbz2.so.$(PKG_VERSION) $(1)/usr/lib/libbz2.so.1.0
 81 endef

  For example, if you don't want the "libbz2.so" to be included, you can
remove lines 79 and 80.





2018-03-07 9:00 GMT-03:00 Arjav Parikh <parikharjav24 at gmail.com>:

> Hi Ronaldo,
>
> I am building firmware for IPQ806x platform. I have been able to
> reduce my firmware image from 22 MB to 10 MB  by disabling unwanted
> kernel modules and libraries using make menuconfig.
>
> But there are files in root-ipq806x/lib/fimrware directory of approx
> size 4.4 MB. I do not require any of the files present in this
> directory. I tried to remove those files by removing its entry from
> root-ipq806x/usr/lib/opkg/info/wigig-firmware.list assuming that on
> next build these files wont appear but still the files are there in
> /lib/firmware directory.
> By removing these files I can further reduce filesystem by 4 MB.
>
>
> On Wed, Mar 7, 2018 at 5:07 PM, Ronaldo Afonso
> <ronaldo at ronaldoafonso.com.br> wrote:
> >   Hi Arjav,
> >
> >   Which kind of firmware are you using? An OpenWrt prebuilt (from
> > https://downloads.openwrt.org/releases/) or a firmware build by
> yourself?
> >
> >   Well, in or case, I suggest you build your firmware ... using "make
> > menuconfig" is the first thing to try for removing unnecessary binaries.
> >
> >
> >
> > 2018-03-07 8:02 GMT-03:00 Arjav Parikh <parikharjav24 at gmail.com>:
> >>
> >> Hi,
> >>
> >> I want to reduce the root file system size for my project. Till now
> >> after removing the unnecessary kernel modules, libraries and using
> >> strip binary the file system size has been reduced to 8.3 MB. Bu there
> >> are still some files which are not required and I am unaware of how to
> >> prvent these files from being included in my file system using
> >> openwrt.
> >>
> >> For Ex: there are multiple binaries in /lib/firmware which are not
> >> required. This folder itself contains size of 4.4 MB, apart from these
> >> there are many libraries in /lib as well as /usr/lib which are not
> >> required.
> >>
> >> Can anyone please guide of how to remove firmware binaries and
> >> libraries in openwrt.
> >>
> >> --
> >> Thanks & Regards,
> >> Arjav Parikh
> >> _______________________________________________
> >> openwrt-devel mailing list
> >> openwrt-devel at lists.openwrt.org
> >> https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
> >
> >
> >
> >
> > --
> > Ronaldo Afonso
> > 11 9 5252 0484
> > www.ronaldoafonso.com.br
>
>
>
> --
> Thanks & Regards,
> Arjav Parikh
>



-- 
Ronaldo Afonso
11 9 5252 0484
www.ronaldoafonso.com.br
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