Ok, I've learned a couple of things about why we are having trouble with
multiple cards. From README.devices in the ivtv-driver package:
"A maximum of 8 cards are allowed at the moment. However, for PVR 350s
the maximum might be 4 or 5 because we run out of available vbi device
numbers. We don't yet know how the v4l layer will handle a case like that."
So this is probably related to the following from videodev.c from the linux
kernel:
case VFL_TYPE_VBI:
base=224;
end=240;
name_base = "vbi";
break;
In our case, we get 5 cards working (out of 8 in the machine). Each card
allocates 3 vbi drivers, so there is only room for 5 cards within the available
16 slots.
For our usage, we do not need any of the vbi devices, so if this is the reason
why we can not utilize more cards in each machine, we would like to work around
this limit. One option would be to add some option to the driver to avoid
allocating vbi devices. Another would be to increase the upper limit for the vbi
devices to 255 instead of the current 240.
Does anybody have any recommendation, or have any good reasons why not simply
upping the limit to 255 should solve the problem?
Thanks,
Marius K.
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