USB 音效卡驅動

交叉編譯 Linux kernel

編譯參數

在原編譯檔 .config 的 General setup 上方加上 CONFIG_SOUND=m
注意: 開始編譯後，會出現許多詢問項目，必須輸入 m 或 y

CONFIG_SOUND=m
#
# General setup
#
..... 

Advanced Linux Sound Architecture (SND) [N/m/?] (NEW) m

 Sequencer support (SND_SEQUENCER) [N/m/?] (NEW) m
    Sequencer dummy client (SND_SEQ_DUMMY) [N/m/?] (NEW) m
  OSS Mixer API (SND_MIXER_OSS) [N/m/?] (NEW) m
  OSS PCM (digital audio) API (SND_PCM_OSS) [N/m/?] (NEW) m
  OSS PCM (digital audio) API - Include plugin system (SND_PCM_OSS_PLUGINS) [Y/n/?] (NEW) y
  OSS Sequencer API (SND_SEQUENCER_OSS) [N/y/?] (NEW) y
  Dynamic device file minor numbers (SND_DYNAMIC_MINORS) [N/y/?] (NEW) y
  Support old ALSA API (SND_SUPPORT_OLD_API) [Y/n/?] (NEW) y
  Verbose procfs contents (SND_VERBOSE_PROCFS) [Y/n/?] (NEW) y
  Verbose printk (SND_VERBOSE_PRINTK) [N/y/?] (NEW) y
 Debug (SND_DEBUG) [N/y/?] (NEW) n

  *
  * Generic devices
  *
  Dummy (/dev/null) soundcard (SND_DUMMY) [N/m/?] (NEW) m
  Virtual MIDI soundcard (SND_VIRMIDI) [N/m/?] (NEW) m
  MOTU MidiTimePiece AV multiport MIDI (SND_MTPAV) [N/m/?] (NEW) m
  UART16550 serial MIDI driver (SND_SERIAL_U16550) [N/m/?] (NEW) m
  Generic MPU-401 UART driver (SND_MPU401) [N/m/?] (NEW) m

*
* USB devices
*
USB Audio/MIDI driver (SND_USB_AUDIO) [N/m/?] (NEW) m
Native Instruments USB audio devices (SND_USB_CAIAQ) [N/m/?] (NEW) m
  enable input device for controllers (SND_USB_CAIAQ_INPUT) [N/y/?] (NEW) y

*
* System on Chip audio support
*
ALSA for SoC audio support (SND_SOC) [N/m/?] (NEW) m
*
* STMicroelectronics SoCs support
*
STMicroelectronics SoCs support (SND_STM) [N/m/?] (NEW) m
  Name of BPA2 partition to allocate buffers from (SND_STM_BPA2_PARTITION_NAME) [audio] (NEW)
  STx7100 and STx7109 support (SND_STM_STX710X) [N/m/?] (NEW) m
  STx7105 support (SND_STM_STX7105) [M/n/?] (NEW) m
  STx7111 support (SND_STM_STX7111) [N/m/?] (NEW) m
  STx7141 support (SND_STM_STX7141) [N/m/?] (NEW) m
  STx7200 support (SND_STM_STX7200) [N/m/?] (NEW) m
  Dummy converter driver (SND_STM_CONV_DUMMY) [N/m/?] (NEW) m
  Generic GPIO-controlled converter driver (SND_STM_CONV_GPIO) [N/m/?] (NEW) m
  Generic I2C-controlled converter driver (SND_STM_CONV_I2C) [N/m/?] (NEW) m

*
* Open Sound System
*
Open Sound System (DEPRECATED) (SOUND_PRIME) [N/m/?] (NEW) n

開始編譯

make ARCH=sh CROSS_COMPILE=sh4-linux- vmlinux
make ARCH=sh CROSS_COMPILE=sh4-linux- modules
make ARCH=sh CROSS_COMPILE=sh4-linux- modules_install INSTALL_MOD_PATH=./modules_install

make the vmlinux.ub

sh4-linux-objcopy -O binary vmlinux vmlinux.bin
gzip --best --force vmlinux.bin
mkimage -A sh -O linux -T kernel -C gzip -a 0x80800000 -e 0x80801000 -n "Linux 2.6" -d vmlinux.bin.gz vmlinux.ub

交叉編譯 ALSA-Lib 與 ALSA-Utils 套件

套件下載: http://www.alsa-project.org/main/index.php/Download

alsa-lib

CC=sh4-linux-gcc \
./configure --host=sh4-linux

make
make install DESTDIR=/home/alang/STLinux_Cross-Compile/build_opt/alsa-lib

alsa-utils

CC=sh4-linux-gcc \
./configure --host=sh4-linux

make
make install DESTDIR=/home/alang/STLinux_Cross-Compile/build_opt/alsa-utils

安裝 ALSA 驅動模組

安裝模組檔至以下目錄
/lib/modules/2.6.23.17_stm23_A18B-PDK7105-32BITS-A18B/kernel/sound

啟動模組
modprobe soundcore
modprobe snd-usb-audio
modprobe snd-pcm-oss
modprobe snd_seq_midi
modprobe snd_seq_oss 

TIP:

如果啟動失敗，必須執行 depmod -a

檢視安裝後的模組列表

15:16:12[0]root@sh4twbox ~ # lsmod
Module                  Size  Used by    Not tainted
snd_rawmidi            22496  1 snd_usb_lib
snd_usb_lib            15712  1 snd_usb_audio
snd_page_alloc          6376  1 snd_pcm
snd_timer              21060  1 snd_pcm
snd_mixer_oss          15680  1 snd_pcm_oss
snd_seq_device          6860  1 snd_rawmidi
snd_hwdep               7492  1 snd_usb_audio
snd_pcm                78373  2 snd_pcm_oss,snd_usb_audio
snd_pcm_oss            47360  0
snd                    49972  9 snd_pcm_oss,snd_mixer_oss,snd_usb_audio,snd_pcm,snd_timer,snd_usb_lib,snd_rawmidi,snd_seq_device,snd_hwdep
snd_usb_audio          80128  0

參考連結

• http://alsa.opensrc.org/AlsaBuild2.6
• http://alsa.opensrc.org/TroubleShooting