ALSA Installation

Compilation

• On your Host select ALSA compilation in Linux configuration:

 $ make linux-menuconfig

Device Drivers --->
    <M> Sound card support --->
        <M> Advanced Linux Sound Architecture--->
            [*] ARM sound devices --->
                <M> i.MX1/L TSC2102 alsa driver

 <M> Advanced Linux Sound Architecture
 < >   Sequencer support (NEW)
 <M>   OSS Mixer API
 <M>   OSS PCM (digital audio) API
 [*]     OSS PCM (digital audio) API - Include plugin system (NEW)
 [ ]   Dynamic device file minor numbers (NEW)
 [*]   Support old ALSA API (NEW)
 [ ]   Verbose procfs contents (NEW)
 [ ]   Verbose printk
 [ ]   Debug
 [ ]   Debug
 [ ]   Generic sound devices  --->
 [*]   ARM sound devices  --->
 [ ]   SPI sound devices  --->
 [ ]   USB sound devices  --->
 < >   ALSA for SoC audio support  --->

• in Buildroot configuration, select the user space packages for ALSA:

 $ make menuconfig

 Package Selection for the target-> Audio libraries:
 
 --- Audio libraries and applications
 [*]   alsa-lib
 [*]     alsa-utils
         ALSA utils selection  --->
 [ ]   asterisk
 [*]   aumix
 [ ]   libmad
 ---   libid3tag
 ---   libmad
 [ ]     libmad headers in target
 [ ]   libsndfile
 ---   libvorbis requires the package libogg to build
 [*]   madplay
 [ ]   mpg123

 in ALSA utils selection  --->
 [*] alsaconf
 [*] alsactl
 [*] alsamixer
 [ ] amidi
 [*] amixer
 [*] aplay
 [ ] arecord
 [ ] iecset
 [ ] aconnect
 [ ] aplaymidi
 [ ] arecordmidi
 [ ] aseqdump
 [ ] aseqnet
 [*] speaker-test

• save your configuration and rebuild your rootfs:

 $ make

• reflash your rootfs and your Linux kernel. Go here if you need more infos on how to install Linux drivers.

nodes creation

Automatically done by Buildroot / mdev, so only here as reference.
In /dev/snd/ you should have:

 mknod controlC0 c 116 0
 mknod pcmC0D0c c 116 24
 mknod pcmC0D0p c 116 16

Links

• Buildroot bug (aplay: set_params:1012: unable to install sw params:)