On Mon, May 1, 2017 at 10:11 AM, Frank Schäfer <fschaefer....@googlemail.com> wrote: > > Am 01.05.2017 um 13:38 schrieb Mauro Carvalho Chehab: >> Right now, all devices use bus 0 for eeprom. However, newer >> versions of Terratec H6 use a different buffer for eeprom. >> >> So, add support to use a different I2C address for eeprom. > > Has this been tested ? > Did you read my reply to the previous patch version ?: > See http://www.spinics.net/lists/linux-media/msg114860.html > > I doubt it will work. At least not for the device from the thread in the > Kodi-forum.
Based on what I know about the Empia 2874/2884 design, I would be absolutely shocked if the eeprom was really on the second I2C bus. The boot code in ROM requires the eeprom to be on bus 0 in order to find the 8051 microcode to be executed. This is a documented hardware design requirement. I have seen designs where the first bus is accessible through an I2C gate on a demodulator on the second bus. This creates a multi-master situation and I have no idea why anyone would ever do this. However it does explain a situation where the EEPROM could be optionally accessed via the second bus (if the I2C gate on the demod was open at the time). Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com
