How to make raspbian load the i2c-dev module on boot up

Question

I have installed 2012-07-15-wheezy-raspbian, and the i2c-dev module and i2c_bcm2708 are there and work with i2c-tools.

How do I get the i2c-dev module etc. to load at bootup?

Alex Chamberlain · Accepted Answer · 2012-07-21 21:35:14Z

14

Assuming the module loads using sudo modprobe i2c-dev, you should add i2c-dev to /etc/modules.

answered Jul 21, 2012 at 21:35

Alex Chamberlain

15.6k14 gold badges68 silver badges113 bronze badges

for clarification for us non-linux guys. "modules" is the file, it has no file name extension.
– Eric Schneider
Commented Mar 15, 2015 at 16:07

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okertanov · Accepted Answer · 2012-07-24 13:58:14Z

7

They are blacklisted in /etc/modprobe.d/raspi-blacklist.conf

# blacklist spi and i2c by default (many users don't need them)

blacklist spi-bcm2708
blacklist i2c-bcm2708

so comment these lines.

answered Jul 24, 2012 at 13:58

okertanov

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I uncommented them. spidev, spi-bcm2708 and i2c-bcm2708 all loaded, but i2c-dev didn't so I guess I still need it in /etc/modules
– John La Rooy
Commented Jul 25, 2012 at 9:57
1

Why on earth would they blacklist these!?!
– Alex Chamberlain
Commented Aug 6, 2012 at 8:03
@AlexChamberlain because an average user don't need those modules. From modprobe.conf man page: There are cases where two or more modules both support the same devices, or a module invalidly claims to support a device: the blacklist keyword indicates that all of a particular module's internal aliases are to be ignored. [ linux.die.net/man/5/modprobe.conf ]
– gurcanozturk
Commented May 27, 2013 at 13:48

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2 Answers 2