linux2.6.37音频不可用修改

 

Linux 2.6.37 音频更改

#include <sound/s 3c 24xx_uda134x.h> #include <sound/uda134x.h> struct s 3c 24xx_uda134x_platform_data s 3c 24xx_uda134x_data = {       .l3_clk = S 3C 2410_GPB4,       .l3_data = S 3C 2410_GPB3,       .l3_mode = S 3C 2410_GPB2,       .model = UDA134X_UDA1341, }; static struct platform_device s 3c _device_uda134x = {       .name = "s 3c 24xx_uda134x",       .dev = {            .platform_data      = &s 3c 24xx_uda134x_data,       } };

 

de>static struct platform_device *smdk2440_devices[] __initdata = {     &s 3c _device_usb,     &s 3c _device_lcd,     &s 3c _device_wdt,     &s 3c _device_i 2c 0,     &s 3c _device_iis,     &s 3c _device_rtc,         &s 3c _device_dm9000,     &s 3c _device_uda134x,   //加上这句 };   # make menuconfig >选上以下几项：

Device Drivers --->        <*> Sound card support --->           --- Sound card support               <*> Advanced Linux Sound Architecture --->                 --- Advanced Linux Sound Architecture                    <*> OSS Mixer API                    <*> OSS PCM (digital audio) API                     [*] Verbose procfs contents                    <*> ALSA for SoC audio support --->                       --- ALSA for SoC audio support                         <*> SoC Audio for the Samsung S3CXXXX chips                         <*> SoC I2S Audio support UDA134X wired to a S 3C 24XXde

改正后的内核 可以看到dev/dsp设备 检查硬件电路后音频无输出，最后查证原因是linux 2.6.37 的音频不可用

更改 2.6.37 的音频

可以下载 Linux- 2.6.36 的内核源码；
然后复制 "Linux-2.6.36/sound/" 目录和 "Linux-2.6.36/include/sound/" 目录到 Linux-2.6.37 内核中替换掉对应的目录；重新编译

启动后 可以在dev下看到 dsp dsp2两个设备，测试dsp2正常

拷贝madplay 相关文件到 相应目录下

因为madplay默认的是用dsp 更改方法

 

rm dev/dsp

ln –s dsp dsp2

执行 madplay 播放正常