i2c-core.ko fails to load as module in 2.6 kamikaze due to missing symbols

[carlb]

Error messages on load of i2c-core.ko driver (as reported by logread) are:

Jan 2 17:41:17 network user.warn kernel: i2c_core: Unknown symbol i2c_board_list

Jan 2 17:41:17 network user.warn kernel: i2c_core: Unknown symbol i2c_first_dynamic_bus_num

Jan 2 17:41:17 network user.warn kernel: i2c_core: Unknown symbol i2c_board_lock

These are caused by drivers/i2c/i2c-core.c using various symbols which are defined only in i2c-boardinfo.c

The build process builds i2c-core.c -> i2c-core.o -> i2c-core.ko but only takes i2c-boardinfo.c -> i2cboardinfo.o without using the resultant .o file for much of anything, as far as I can tell.

Changing line 38 of i2c-core.c from: #include "i2c-core.h" to #include "i2c-boardinfo.c" will produce a working i2c-core.ko module. Not sure if there's a better way to do this?

This bug can break various peripheral drivers, including USB TV tuners and I2C realtime clocks, which depend on i2c-core when loading other device-specific drivers

[florian]

Looks like a kernel bug, not directly related to OpenWrt. Can you make sure this was fixed recently by kernel devs ?

[anonymous]

still broken in trunk, kernel 3.1.10

[jogo]

Works for me:

root@OpenWrt:/# dmesg | grep i2c
[   10.748000] i2c /dev entries driver
root@OpenWrt:/# lsmod | grep i2c
i2c_dev                 4149  0
i2c_core               13696  1 i2c_dev

i2c-boardinfo.c is compiled into the kernel, so if previously didn't select kmod-i2c-core, you will need to reflash the kernel/image.