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Dac+ pro error in dmesg

Hi I'm just curious if this is normal...

The Dac+ pro is working (as i can get sound from it) but I'm just wondering what these CPU DAI (null) not registered all about... do you know?

Thanks

[ 5.721928] gpiomem-bcm2835 3f200000.gpiomem: Initialised: Registers at 0x3f200000
[ 5.989292] snd-rpi-hifiberry-dacplus sound: ASoC: CPU DAI (null) not registered
[ 5.989378] snd-rpi-hifiberry-dacplus sound: snd_soc_register_card() failed: -517
[ 6.091060] EXT4-fs (mmcblk0p6): re-mounted. Opts: (null)
[ 6.601400] bcm2835-rng 3f104000.rng: hwrng registered
[ 6.601959] snd-rpi-hifiberry-dacplus sound: ASoC: CPU DAI (null) not registered
[ 6.601996] snd-rpi-hifiberry-dacplus sound: snd_soc_register_card() failed: -517
[ 6.603245] bcm2708_i2c 3f804000.i2c: BSC1 Controller at 0x3f804000 (irq 79) (baudrate 100000)
[ 6.603590] snd-rpi-hifiberry-dacplus sound: ASoC: CPU DAI (null) not registered
[ 6.603602] snd-rpi-hifiberry-dacplus sound: snd_soc_register_card() failed: -517
[ 6.604384] snd-rpi-hifiberry-dacplus sound: ASoC: CODEC DAI pcm512x-hifi not registered
[ 6.604396] snd-rpi-hifiberry-dacplus sound: snd_soc_register_card() failed: -517
[ 6.905262] snd-rpi-hifiberry-dacplus sound: pcm512x-hifi <-> 3f203000.i2s mapping ok

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