On 09/12/2010 09:17 PM, Rory Filer wrote: > Hello, > > Let me point out in advance that my problem is pretty trivial compared to > most of the postings on that list. If a journey in sound engineering on > Linux is 1000 steps, I'm at step 1 here. I basically tried configuring sound > into the kernel but it didn't seem to work. If you think you can help, > please read on. Otherwise, stop here. > > And thanks to all who continue from here... > > I want to build sound support into my embedded Linux platform (2.6.28); the > CPU supports I2S in silicon, but I haven't got a driver for that yet. My > plan is to build the kernel with SOUND/SND configurations enabled and start > working on the driver later. In my configurations, I've left all the sound > card-specific options out, keeping just the CONFIG_SND_SOC. I thought it > would be sufficient to install snd-dummy so that any cross-compiled audio > applications could be fooled into working. l rebuilt the kernel after *make > clean* and noted several new SND files being compiled. So far so good. The > final zImage was only a little larger. Overall, the configuration and build > seemed to be going through all the right motions, but when I loaded zImage > onto the target I didn't see any bootup logging that suggested audio was now > working. As an experiment, I tried to insmod snd_dummy.ko but got a long > list of errors. I guess I'm missing something basic. > > Here's my configuration choices: > >> CONFIG_SOUND=m >> CONFIG_SOUND_OSS_CORE=y >> CONFIG_SND=m >> CONFIG_SND_TIMER=m >> CONFIG_SND_PCM=m >> # CONFIG_SND_SEQUENCER is not set >> CONFIG_SND_OSSEMUL=y >> CONFIG_SND_MIXER_OSS=m >> CONFIG_SND_PCM_OSS=m >> CONFIG_SND_PCM_OSS_PLUGINS=y >> # CONFIG_SND_DYNAMIC_MINORS is not set >> CONFIG_SND_SUPPORT_OLD_API=y >> CONFIG_SND_VERBOSE_PROCFS=y >> # CONFIG_SND_VERBOSE_PRINTK is not set >> # CONFIG_SND_DEBUG is not set >> CONFIG_SND_DRIVERS=y >> # CONFIG_SND_PCSP is not set >> CONFIG_SND_DUMMY=m >> # CONFIG_SND_MTPAV is not set >> # CONFIG_SND_MTS64 is not set >> # CONFIG_SND_SERIAL_U16550 is not set >> # CONFIG_SND_MPU401 is not set >> # CONFIG_SND_PORTMAN2X4 is not set >> # CONFIG_SND_ISA is not set >> # CONFIG_SND_PCI is not set >> # CONFIG_SND_SPI is not set >> # CONFIG_SND_USB is not set >> # CONFIG_SND_PCMCIA is not set >> CONFIG_SND_SOC=m >> CONFIG_SND_SOC_ALL_CODECS=m >> CONFIG_SND_SOC_AD73311=m >> CONFIG_SND_SOC_AK4535=m >> CONFIG_SND_SOC_CS4270=m >> CONFIG_SND_SOC_SSM2602=m >> CONFIG_SND_SOC_TLV320AIC23=m >> CONFIG_SND_SOC_TLV320AIC26=m >> CONFIG_SND_SOC_TLV320AIC3X=m >> CONFIG_SND_SOC_UDA1380=m >> CONFIG_SND_SOC_WM8510=m >> CONFIG_SND_SOC_WM8580=m >> CONFIG_SND_SOC_WM8731=m >> CONFIG_SND_SOC_WM8750=m >> CONFIG_SND_SOC_WM8753=m >> CONFIG_SND_SOC_WM8900=m >> CONFIG_SND_SOC_WM8903=m >> CONFIG_SND_SOC_WM8971=m >> CONFIG_SND_SOC_WM8990=m >> # CONFIG_SOUND_PRIME is not set >> > > And here is the list of errors from installing snd-dummy.ko > > [r...@127 drivers]#insmod snd-dummy.ko > Using snd-dummy.ko > snd_dummy: Unknown symbol snd_pcm_lib_free_pages > snd_dummy: Unknown symbol snd_pcm_set_ops > snd_dummy: Unknown symbol snd_ctl_boolean_stereo_info > snd_dummy: Unknown symbol snd_card_new > snd_dummy: Unknown symbol snd_pcm_lib_ioctl > snd_dummy: Unknown symbol snd_pcm_lib_malloc_pages > snd_dummy: Unknown symbol snd_pcm_lib_preallocate_pages_for_all > snd_dummy: Unknown symbol snd_card_free > snd_dummy: Unknown symbol snd_ctl_add > snd_dummy: Unknown symbol snd_pcm_new > snd_dummy: Unknown symbol snd_pcm_suspend_all > snd_dummy: Unknown symbol snd_pcm_period_elapsed > snd_dummy: Unknown symbol snd_card_register > snd_dummy: Unknown symbol snd_pcm_format_set_silence > snd_dummy: Unknown symbol snd_pcm_format_width > snd_dummy: Unknown symbol snd_ctl_new1 > insmod: cannot insert `snd-dummy.ko': Unknown symbol in module (-1): No such > fil > e or directory > > Best Regards, > > Rory
Hi Rory, You're not missing a library but some other kernel modules which provide those symbols. IIRC the snd-dummy modules requires 'snd_pcm' and 'snd'. After installing the kernel, run 'depmod' and try to load the module with 'modprobe snd-dummy' instead of 'insmod snd-dummy.ko'. See the man-page for modprobe and depmod for details. HTH, robin _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
