From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Seiderer Date: Sat, 28 Mar 2020 15:28:45 +0100 Subject: [Buildroot] Failed to load libmmal.so from rpi-userland package via buildroot toolchain on raspberry pi 4 In-Reply-To: References: <20200328113133.022b01b6@gmx.net> Message-ID: <20200328152845.055bdebc@gmx.net> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Hello Dagg, On Sat, 28 Mar 2020 12:05:38 +0100, daggs wrote: > Greetings, > > > Sent: Saturday, March 28, 2020 at 1:31 PM > > From: "Peter Seiderer" > > To: "iman ahmadvand" > > Cc: buildroot at busybox.net > > Subject: Re: [Buildroot] Failed to load libmmal.so from rpi-userland package via buildroot toolchain on raspberry pi 4 > > > > Hello Iman, > > > > On Sat, 28 Mar 2020 11:39:46 +0430, iman ahmadvand wrote: > > > > > Hi everyone. > > > It seems that loading the MMAL interface shared libraries from rpi-userland > > > package via simple dlopen is not possible, or more specific, the packages > > > or binaries such as VLC or VLC codec plugin (libavcodec_plugin) could not > > > load the libavcodec from FFmpeg which in turn depends on libmmal*.so > > > > > > The steps to reproduce(with BR2_PACKAGE_RPI_USERLAND enabled, > > > BR2_STRIP_strip disabled, BR2_OPTIMIZE_0 enabled): > > > git clone git://git.busybox.net/buildroot buildroot && cd buildroot && git > > > checkout 2019.11.01 > > > make raspberrypi4_defconfig && make all > > > > > > Then in this image try to run a simple c routine with dlopen(), if you do > > > so, for example, ./dltest /usr/lib/libmmal.so you will end up with: > > > > > > symbol 'mmal_port_payload_alloc': can't resolve symbol > > > symbol 'mmal_port_payload_free': can't resolve symbol > > > symbol 'mmal_port_log_category': can't resolve symbol > > > > > > > Can confirm your failure...did not (yet) find out what fails exactly, but > > ldd produces the following ouput (mind the 0x00000000): > > > > $ ldd /usr/lib/libmmal.so > > checking sub-depends for '/usr/lib/libmmal_vc_client.so' > > checking sub-depends for '/usr/lib/libmmal_components.so' > > checking sub-depends for '/usr/lib/libvchiq_arm.so' > > checking sub-depends for '/usr/lib/libvcsm.so' > > checking sub-depends for '/usr/lib/libmmal_core.so' > > checking sub-depends for '/usr/lib/libmmal_util.so' > > checking sub-depends for '/usr/lib/libcontainers.so' > > checking sub-depends for '/usr/lib/libvcos.so' > > checking sub-depends for '/lib/libc.so.0' > > ld-uClibc.so.1 => /lib/ld-uClibc.so.1 (0xb6f8b000) > > libmmal_vc_client.so => /usr/lib/libmmal_vc_client.so (0x00000000) > > libmmal_components.so => /usr/lib/libmmal_components.so (0x00000000) > > libvchiq_arm.so => /usr/lib/libvchiq_arm.so (0x00000000) > > libvcsm.so => /usr/lib/libvcsm.so (0x00000000) > > libmmal_core.so => /usr/lib/libmmal_core.so (0x00000000) > > libmmal_util.so => /usr/lib/libmmal_util.so (0x00000000) > > libcontainers.so => /usr/lib/libcontainers.so (0x00000000) > > libvcos.so => /usr/lib/libvcos.so (0x00000000) > > libc.so.0 => /lib/libc.so.0 (0x00000000) > > /lib/ld-uClibc.so.1 => /lib/ld-uClibc.so.1 (0x00000000) > > > > > > After changing the buildroot toolchain from uclibc to glibc (and a full > > re-build) dlopen() of /usr/lib/libmmal.so works and ldd produces the > > following output: > > > > $ ldd /usr/lib/libmmal.so > > linux-vdso.so.1 (0xbea59000) > > libmmal_vc_client.so => /usr/lib/libmmal_vc_client.so (0xb6f5f000) > > libmmal_components.so => /usr/lib/libmmal_components.so (0xb6f44000) > > libvchiq_arm.so => /usr/lib/libvchiq_arm.so (0xb6f2e000) > > libvcsm.so => /usr/lib/libvcsm.so (0xb6f14000) > > libmmal_core.so => /usr/lib/libmmal_core.so (0xb6ef6000) > > libmmal_util.so => /usr/lib/libmmal_util.so (0xb6ed8000) > > libcontainers.so => /usr/lib/libcontainers.so (0xb6eb5000) > > libvcos.so => /usr/lib/libvcos.so (0xb6e9c000) > > libpthread.so.0 => /lib/libpthread.so.0 (0xb6e71000) > > libdl.so.2 => /lib/libdl.so.2 (0xb6e5e000) > > librt.so.1 => /lib/librt.so.1 (0xb6e47000) > > libc.so.6 => /lib/libc.so.6 (0xb6cfb000) > > /lib/ld-linux-armhf.so.3 (0xb6f8f000) > > > > Regards, > > Peter > > > > > > > Or for another proof of the issue, you can run VLC with X11 to play an > > > MPEG-4 video, and you will end up with VLC could not load the codec module > > > because of the same thing: > > > > > > main debug: loading plugins cache file /usr/lib/vlc/plugins/plugins.dat > > > main warning: cannot read /usr/lib/vlc/plugins/plugins.dat: No such > > > file or directory > > > main debug: recursively browsing `/usr/lib/vlc/plugins' > > > main warning: cannot load module > > > `/usr/lib/vlc/plugins/codec/libavcodec_plugin.so' ((null) > > > > > > Any idea about this? > > > > > > Best Regards. > > > IMAN. > > I wonder, how do you run ldd on the pi4 with the buildroot env? I'm trying to debug my mmal issue too. Exactly with the command line as given above 'ldd /usr/lib/libmmal.so' on the target (here pi4), what do your mean with buildroot env (do not mix 'ldd - print shared object dependencies' with 'ld - The GNU linker')? Regards, Peter > > Thanks. > > Dagg. > _______________________________________________ > buildroot mailing list > buildroot at busybox.net > http://lists.busybox.net/mailman/listinfo/buildroot