On Thu, 08 Jun 2017 10:15:34 +0200,
Axel Holzinger wrote:
>
> On Tuesday, June 6, 2017 8:27 PM Takashi Iwai wrote:
> > On Mon, 05 Jun 2017 11:49:53 +0200,
> > Axel Holzinger wrote:
> > >
> > > Hi,
> > >
> > > I'm trying to get a RME HDSPe MADI card to run in an ARM box with Linux
> > > 4.1.6. I configured the (vendor specific TI) kernel to support the card
> (via
> > > hdspm) compiled into the kernel (not as loadable module).
> > >
> > > The MADI card is detected as a PCI device and the ALSA driver is loaded.
> > > Unfortunately playout does NOT work: aplay is reporting an error:
> > > ALSA lib pcm_mmap.c:374:(snd_pcm_mmap) mmap failed: No such device
> > or
> > > address
> >
> > Hm, this sounds odd. But the line doesn't really correspond to the
> > latest version of alsa-lib. Could you try to upgrade to the latest
> > version? Otherwise it's hard to debug.
>
> I installed ALSA with Debian apt-get. How would I update to a newer version?
Compiling by yourself?
alsa-lib has very few dependency, so it should be easy.
> > > strace:
> > > open("/dev/snd/pcmC0D0p", O_RDWR|O_NONBLOCK|O_CLOEXEC) = 4
> > > fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
> > > ioctl(4, AGPIOC_ACQUIRE or APM_IOC_STANDBY or
> > SNDRV_PCM_IOCTL_INFO,
> > > 0xbecdfb64) = 0
> > > fcntl64(4, F_GETFL) = 0x802 (flags
> O_RDWR|O_NONBLOCK)
> > > ioctl(4, AGPIOC_INFO or SNDRV_PCM_IOCTL_PVERSION, 0xbecdfacc) = 0
> > > ioctl(4, AGPIOC_SETUP or SNDRV_PCM_IOCTL_TTSTAMP, 0xbecdfad4) = 0
> > > mmap2(NULL, 4096, PROT_READ, MAP_SHARED, 4, 0x80000000) = -1 ENXIO
> > (No such
> > > device or address)
> >
> > This error is expected and should be OK. It's an mmap of
> > status/control page, and this isn't supported on ARM, thus the kernel
> > returns -ENXIO. alsa-lib then falls back to the normal ioctl instead
> > of status/control mmap.
>
> Okay, got it. So is the mmap emulation plugin via asound.conf suggested by
> Anders needed then anyhow?
It's irrelevant with the mmap emulation.
> > But the ring-buffer mmap is supported as normal on ARM for MADI
> > driver, at least. MADI provides the SG-buffer that is mappable via
> > DMA coherent pages, and it should work on most of archs as is.
>
> Well I found out something more: If I don't give a "--device" parameter to
> aplay and the RME card is default, then audio is playing. But I give the "
> --device=default:CARD=HDSPMx5c74" then the error is occuring. That doesn't
> make sense to me at all. The tests made were with the asound.conf Anders
> suggested. Isn't that strange?
Are you using dmix or such? It appears more like a configuration
issue. With the unmodified configuration, the "default" PCM for HDSPM
should be equivalent with "plughw".
Could you check whether aplay -M works without device option?
> > You should have another error from mmap, with a different offset
> > value. That's the real error we need to track down.
>
> I attached the complete strace.
OK, the strace shows the mmap failure of the second channel.
> > (And, 4.1.x is pretty old, rather too old for debugging, too...)
>
> Well, I know, but the kernel is a TI based manufacturer kernel for a SoC
> (AM5728). I'm not such an expert to update that to current kernel version
> unfortunately.
>
> If you don't mind I have another question: If specifying a device
> "--device", how would I "send" audio to the "upper" channels/tracks of the
> MADI card? If I ommit the "--device" parameter audio is playing on
> channels/tracks 1+2. How would I play audio to channels/tracks 33+34 for
> example?
Well, you likely need to fiddle with the asoundrc in such a case.
Maybe a better option is to use JACK or such, I suppose.
Takashi
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