[Re: [linux-dvb] Compro Videomate DVB-T200 and friends

James Fidell james at fidell.co.uk
Mon Sep 11 23:13:19 CEST 2006


Hartmut Hackmann wrote:

> You are right, a new firmware download is only initiated when no firmware
> is present. This is by intention and should not be changed.
> Its a bit dangerous to fiddle around with the firmware loading mechanism,
> this can easily end up in a crash of the on chip processor.
> On some Compro cards, the PCI reset is not forwarded to the other chips.
> So you need a power cycle to get the chips reset and to load other
> firmware.

Ah. I can see why that might be a bad thing.  What's the recommended
method for upgrading the firmware after a power cycle then?  Or is your
advice to stick with whatever firmware is installed by default?  (My
card comes up with rev 26 from cold by the looks of it.)

> A last hint. When i investigated the tuner module of you card, i noticed
> that it tunes very slowly. When you notice that several scans give
> different
> results, the cause can easily be that the tuner can receive all signals,
> but
> a timeout of the scan routine prevents this.

I'll check that out.

If I may return to a comment in one of your earlier emails, you wrote:

> The tda10046 does not correct for frequently reported offsets of
> 167000Hz, which seem to be mostly negative in the UK. So in case you
> miss a multiplex, you might try to "dvbscan" again with such offsets.

Is this likely to be the reason that the DVB-T200 card gives dvbscan
errors like:

>>> tune to:
802166670:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
WARNING: >>> tuning failed!!!>>> tune to:
802166670:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
(tuning failed)
WARNING: >>> tuning failed!!!retrying with f=530000000
>>> tune to:
530000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
(tuning failed)
WARNING: >>> tuning failed!!!>>> tune to:
530000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
(tuning failed)
WARNING: >>> tuning failed!!!retrying with f=634166670

where the Hauppauge card finds more channels?

James



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