[linux-dvb] [drv] noncoherent io

[<mocm@metzlerbros.de>]

Stephane Fillod writes:
 > 
 > Hi,
 > 
 > I have a non-PC board that has non-coherent IO, i.e. the PCI bus-master
 > controller does not handle CPU cache coherency. Most Linux driver are
 > portable tough, but it looks like the dvb driver isn't.
 > The trick to handle this issue seamlessly is to use the 
 > pci_map_single/pci_unmap_single calls. I've done it for the version 0.8.2,
 > and it works fine (OSD, PES playback with cat foo.mpg>/dev/video, etc.). 
 > Please find the patch in attachement.
 > 
 > Now, I'd like to contribute it, and if possible to have it accepted in next 
 > versions. Unfortunately (for me), many things changed in 0.9.4, and I'm
 > not sure where the bus-master transfers take place.
 > I saw couple of ioremap, which make me think vanilla 0.9.4 improved over 0.8.2,
 > esp. because here 0.9.4 is able to load firmware and display OSD without any 
 > glitches. However, I'm unable to play back PES streams. Using play_file_video 

Always (always always always) use the latest CVS before patching
anything.

 > in test_video.c, it shows the first couple seconds of my MPEG file, and then
 > it stops. 
 > 
 > It looks like a FAQ, but how am I supposed to playback simple PES streams?
 > (no, mplayer is dog, there must be something simpler). Can some SAA7146
 > dude help me pinpoint where BM tranfers are done? I would sure appreciate it.
 > 
 > The card is DVB-s 1.3, kernel is 2.4.17-mips patched for my platform.
 > 

If test_video.c doesn't work ( it may not, I haven't checked), try ntuxplayer.
How does it stop? Stop as in freeze and I need CTRL-C to get out, or
stop as in program done?

Marcus


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