Re: em28xx: msi Digivox ATSC board id [0db0:8810]

["Frank Schäfer" <fschaefer.oss@googlemail.com>]

Am 29.11.2012 03:15, schrieb Antti Palosaari:
> On 11/29/2012 04:05 AM, Matthew Gyurgyik wrote:
>> On 11/28/2012 05:55 PM, Antti Palosaari wrote:
>>>
>>> Very, very, good pics and sniffs!!
>>>
>>>
>>> From the sniff you could see I2C addresses
>>> 50 (a0 >> 1) eeprom
>>> 0e (1c >> 1) demod
>>> 60 (c0 >> 1) tuner
>>>
>>>
>>> EM2874, USB-bridge, clocked at 12MHz, crystal on other side of PCB.
>>> There is also 32k serial eeprom for EM2874. This large serial eeprom
>>> means (very likely) it uses custom firmware which is downloaded from
>>> the eeprom.
>>>
>>> LGDT3305, demodulator, clocked at 25MHz. Serial TS used between EM2874
>>> and LGDT3305.
>>>
>>> TDA18271HDC2 is tuner, clocked at 16MHz. Traditional IF used between
>>> tuner and demod.
>>>
>>> IR receiver is near antenna, which is a little bit long wires to
>>> connect to the EM2874, looks weird but no harm.
>>>
>>>
>>> Main GPIO sequence is that one:
>>> 000255: 000006 ms 000990 ms c0 00 00 00 80 00 01 00 <<< ff
>>> 000256: 000004 ms 000994 ms 40 00 00 00 80 00 01 00 >>> fe
>>> 000257: 000006 ms 001000 ms c0 00 00 00 80 00 01 00 <<< fe
>>> 000258: 000004 ms 001004 ms 40 00 00 00 80 00 01 00 >>> be
>>> 000259: 000139 ms 001143 ms c0 00 00 00 80 00 01 00 <<< be
>>> 000260: 000005 ms 001148 ms 40 00 00 00 80 00 01 00 >>> fe
>>>
>>> There is some more GPIOs later, just test with trial and error to find
>>> out all GPIOs.
>>>
>>> Making that device working should be quite easy! There is a little
>>> change for proprietary firmware for EM2874 which does some nasty
>>> things, but that is very very unlikely.

Do we know any devices with a "real" proprietary firmware ??
I'm not talking about custom USB ID, endpoint configuration and minor
stuff like this...

>>>
>>> regards
>>> Antti
>>
>> Thanks for the information. That is way over my head. Is there same
>> basic reading someone could recommend so I can start to understand the
>> basics of all this?
>>
>> In the mean time, I'm willing to do any testing necessary.
>>
>
> Maybe I could give hour or two for that if you could make tests I ask?
>
> If someone else would like to hack with it, I am very happy too. Frank?
>

Seems like we have all we need, right ? A TDA18271 driver seems to be in
place, what about the LGDT3305 demodulator ?
I can try to put the puzzle together, but not before weekend.
Matthew, stay tuned but be patient. ;)

Regards,
Frank


> regards
> Antti
>