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

[Holger Waechtler <holger@convergence.de>]

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?

Holger




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