[linux-dvb] Re: Solved, patch attached: DVB-C tuning problems caused by inittab changes in ves1820.c since 2003-05-24

[Johannes Stezenbach <js@convergence.de>]

Holger Waechtler wrote:
> Johannes Stezenbach wrote:
> >
> >I would apply this, because I think it's useful, and I don't know if the
> >EEPROM is writable at all (could be write-protected), and if it is
> >writable you could shoot yourself in the foot by writing crap to it.
> >Also there's no utility for writing the EPPROM.
> 
> (Probably because it's too trivial for a seperate utility?;)
> 
> Just take a look in the 24lc16 datasheet, writing to an EEPROM is as 
> simple as reading.
> 
> Write protection can be disabled by simply scratching or cutting the WP 
> line. But is it's true that Siemens provides a calibration utility I 
> doubt that there is any write protection so there is probably no need to 
> scratch on your card...
> 
> About broken EEPROMs: The cards will just show up with bogus 
> vendor/device ids, nothing really serious. You just need to add this id 
> the the PCI vendor/device id tables in the saa7146 driver and then you 
> can write the EEPROM again. Nothing to worry about if it's well documented.
> 
> >I don't like this. IMHO the VES1820 driver should
> >always printk the PWM value from EEPROM during initialization.
> >AFC can be printed with Jaakko's utility. We just need a pointer
> >to it and a "howto fix dvb-c tuning problems" doc.
> 
> Both a HOWTO-use-the-Siemens-calibration-utility or an alternative 
> solution for Linux using e.g. a pseudo-frontend-driver should perfectly 
> help everybody who has the same problems like you, not?

I have no doubts it can be done somehow.

But as long as this utility does not exist it would be better to
have the PWM module paramter than nothing.

my 2¢,
Johannes


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