[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>]

Oliver Lorei wrote:
> On Tuesday 19 August 2003 13:58, Holger Waechtler wrote:
>
>
> > > sorry for my ignorance,
> > >
> > > but when you install the Orignal Software from Siemens for W9x the
> > > first time on a clean W9x installation then it does once a receiver
> > > calibration before the Software start the first time (at least a popup
> > > window shows it)
> > >
> > > I don't know what happens there and perhaps i totaly wrong
> > I was thinking about a tool just like this, shouldn't really be too hard
> > to implement. But if you say that the Windows software does it anyway
> > you maybe just have to boot Windows to fix your EEPROM...
>                     ^^^^^     
> no it's very hard do this with windows, I get it only on a clean fresh 
> Windows installation, and only once when you start the Software for the 
> first Time, a Simple  deinstall (Software + Driver ) and then install the 
> Software again does not work for me .... IMHO no solution
>
> and since a long time ago there was no more Space left for Windows on my HD 
> a larger /video is more useful ;)
>
> so a Linux tool would realy Great 
:) (then just write one, it's really simple and straightforward -- all 
you need to do is to hack a special version of the ves1820 driver which 
expects a write_pwm module parameter and then writes it to the EEPROM 
somewhere inside the init function. Thenafter write a simple HOWTO and 
post all this to the LinuxDVB mailing list. If it's well done we'll add 
it to the CVS repository in the tools section;)

Performing byte writes is described in section 4.1 on page 7 in the 
24lc16 datasheet, you can get a copy e.g. from the Microchip website: 
http://www.microchip.com/download/lit/pline/memory/ic/21703c.pdf

If you want to dump+save the EEPROM contents before you do anything else 
you can code a loop which reads all bytes from 0...0xff and dumps them 
on the console. Take ves1820.c:read_pwm() as example how to read a byte.

On Budget-PCI cards only the first very few bytes which are non-0xff are 
relevant and need to be saved -- these ones contain the PCI 
vendor/device id and the MAC. The PWM is stored in the last byte.

have fun,

Holger



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