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DAC+ something broken or user error?

martin3

September 06, 2014 11:01

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I found a tutorial to enable the HifiBerry DAC+ on Volumio here: http://volumio.org/forum/volumio-for-raspberry-model-t1574-10.html

The board as such seems to work: I see the green LED goes on on boot, or when I press "play" on the web frontend.

However, there is no sound, and I see a message on the console: "bmc2708-dmaengine: DMA transfer could not be terminated". A bit later it (sometimes) complains about "4096 KiB atomic DMA coherent pool is too small!".

Over the headphone jack, or via HDMI I could play sound (before I modified the config files for the DAC+), so the basic installation seems to be ok.

Does someone have an idea what could be wrong?

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5 comments

• 0
  
  HiFiBerry team September 06, 2014 11:53

  Hi Martin,
  
  what does aplay -l output?
  
  Also note that Michael from Volumio is in the process of creating a new version with DAC+ support. It should be available soon.
  
  Best regards
  Daniel
• 0
  
  martin3 September 06, 2014 14:10

  Hello Daniel
  
  It shows
  

  **** List of PLAYBACK Hardware Devices ****
  card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HifiBerry DAC+ HiFi pcm512x-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
  

  
  
  Yes, I heard about the next release. Supposedly this will only automate the creation of the config files, so I don't have high hopes that it will start to work then.
  
  Thanks! Martin
• 0
  
  HiFiBerry team September 06, 2014 14:22

  The config looks good. However the "4096 KiB atomic DMA coherent pool is too small!" message shows that there are something wrong with the configuration. This error occurs when a process opens hundreds or even thousands of connections to the sound subsystem. It should not happen in normal operations.
  Unfortunately I have no idea, what could be the reason for this issue. Maybe Michelangelo in the Volumio forum has an idea...
  
  Best regards
  Daniel
• 0
  
  martin3 September 06, 2014 14:23

  Meanwhile I also tried with the HifiBerry Digi B+, and got the exact same result.
  There I use the standard driver for the HifiBerry Digi, because I couldn't find another one in the kernel. Of course I undid the changes in asound.conf, because the GUI left these in place.
  
  aplay -l now lists the "snd_rpi_hifiberry_digi", wm8804-spdif-0 as the only device.
• 0
  
  martin3 September 06, 2014 14:24

  Ok, I'll try over there, thanks!