Re: ALSA utility aplay/arecord error

Saurav SAHU <saurav.sahu@xxxxxx> · Mon, 10 Mar 2008 11:59:04 +0800

Hi all

The platform on which I am trying to perform 
ALSA playback and record with USB sound device is based on a MIPS CPU 
running Linux kernel 2.6.14. The kernel uses non-coherent DMA in the 
configuration:

  CONFIG_DMA_NONCOHERENT=y
CONFIG_DMA_NEED_PCI_MAP_STATE=y
CONFIG_CPU_BIG_ENDIAN=y
CONFIG_SYS_SUPPORTS_BIG_ENDIAN=y
CONFIG_BOOT_ELF32=y
CONFIG_MIPS_L1_CACHE_SHIFT=5
I have attached the kernel .config file for 
further information. So far, I have not succeeded in hearing sound with 'aplay', 
or capturing sound with 'arecord'.

If there have been any similar issues 
reported on ALSA usage with MIPS CPU based on non-coherent DMA in 
the past, please let me know. Also, if there have been any patches 
developed for successful resolution of this issue on 
similar platform/configuration, it would be very useful for 
me.

Thanks & Regards
Saurav

  ----- Original Message ----- 
  From: 
  Saurav Sahu 

  To: alsa-user@xxxxxxxxxxxxxxxxxxxxx 

  Sent: Friday, March 07, 2008 4:33 
PM
  Subject: Re: ALSA utility aplay/arecord 
  error

  I have been able to resolve the 
  previously reported errors by setting the environment variable for ALSA 
  configuration file on the target filesystem of the embedded 
  platform.

  However, I do not hear any audio from USB sound 
  device with speaker-test or aplay:

  Upon using arecord for recording, I get an 
  error:

  Is this problem related to a low-level driver 
  issue which may not be working well on target platform? Could there be a DMA 
  related issue as the samples don't seem to be transferred to the USB audio 
  device.

    ----- Original Message ----- 
    From: 
    Saurav Sahu 

    To: alsa-user@xxxxxxxxxxxxxxxxxxxxx 

    Sent: Thursday, March 06, 2008 4:28 
    PM
    Subject: ALSA utility aplay/arecord 
    error

    Hello

    I am working towards using ALSA for playback 
    and capture on an embedded platform running Linux. The kernel uses ALSA 
    driver version 1.0.10rc1. I had manually built and installed ALSA library 
    (v1.0.10) and ALSA utilities (v1.0.10) for the target platform 
    filesystem. I have a USB audio device (C-Media) connected to the 
    USB port of the board and it seems to 
    be successfully successfully detected by the driver.

    However, when I run ALSA utilities 
    like aplay, arecord or speaker-test, I observe errors opening the 
    hardware device which may be related to the configuration on the 
    filesystem.

    Are these errors from ALSA utility/library 
    due to the detection of hardware, ALSA configuration files or 
    something else related to my target device filesystem?

    Thanks in advance for any help. Do let me know 
    if you need any more details.

    Best Regards
    Saurav

Attachment:
dotconfigmips

Description: Binary data
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