[linux-dvb] unstable tda1004x firmware loading

Francesco ml at punkrockworld.it
Tue Jun 17 16:51:16 CEST 2008

> Looks like there currently are many people having problems.
> Allow me to give some background info:
> Something that is not in the datasheet:
> The tda10046 automatically tries to load the firmware from an eeprom at the
> second I2C port. This does *not* need to be triggered by the driver. The timeout
> seems to be very long. In the past, this happened:
> If the driver tries to access the tuner while the download is not finished, there
> is a collision on the I2C bus. This can corrupt both, the firmware and the tuner
> initialization. In the case of the tda8275a, the result can be that it turns off
> its 16MHz reference output which is used for the tda10046 as well. This blocks the
> i2c bus and the only way to recover is a complete power cycle.
> This is why i made the driver try to get the firmware as soon as possible.
> Otherwise it is not possible to access the tuner - at least on some boards.
> Few days ago, a user reported that the firmware download seems to be retriggered
> in some cases. This might occur if something opens the dvb device while the download
> is not finished. If it is the case, we need to lock the download.
> Another dangerous thing is the address mapping of the firmware eeprom: it is
> controlled by a GPIO pin. If this pin changes while the download is running, we are
> lost.
> Best regards
>    Hartmut

I've found a little workaround (not a solution, but...) for this problem 
for my Asus7131H...

Simply adding "saa7134-dvb" to /etc/modules, make a successful firmware 
loading on boot.
(My system is an Ubuntu 7.10)

Francesco Ferrario
- Chimera project -
- www.chimeratv.it -

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