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?

score 14 · Accepted Answer · answered Jul 21 '12 at 21:35

14

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

answered Jul 21 '12 at 21:35

Alex Chamberlain

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

score 7 · Answer 2 · answered Jul 24 '12 at 13:58

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 '12 at 13:58

okertanov

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 Jul 25 '12 at 09:57
1

Why on earth would they blacklist these!?! – Alex Chamberlain Aug 06 '12 at 08:03
@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. [ http://linux.die.net/man/5/modprobe.conf ] – gurcanozturk May 27 '13 at 13:48

2 Answers2