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DVB-T on Typhoon Duo Cardbus: firmware loading fails

On Mon, 1 May 2006, Hartmut Hackmann wrote:

This sounds like you somehow detroyed the eeprom contents. 
Hard to tell for me, but I don't think so:
- I was able to read something back from the eeprom that looks valid
  (I have not actually written back this contents since it's working again)
- Windows driver worked and seems to have used the original firmware, as the
  one distributed with it seems to improve reception quality over what I am
  used to (no skips anymore)
- simply reprogramming the eeprom did not change anything other than the
  eeprom contents - still did not work

Did you use the latest driver from linuxtv.org? Older versions use a
dangerously high I2C bus speed during firmware load.

I generally use the regular kernel git tree and only compile drivers
separately if there is a sufficient motivation. Right now I am using the
latest driver via mercurial.

After the card stopped working, is it still visible on the PCI bus
(lspci)? Or does just the channel decoder boot fail?

As can be seen from the previously posted dmesg output the card seems to
function normally except for the firmware loading (and subsequent
operations, obviously). I do not have any known good signal source to test
other functions, though.

Currently the driver makes no attempt to load external firmware after a
failed boot from eeprom.

I noticed this when looking more closely :-), yet making it do so seems to
have somehow fixed the card.

My current opinion is that it will help only in very rare cases. 
True, I just found the log messages confusing with regard to this.

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