hi
I'm trying to use i2c bus over gpio pin on a microtik routerboard 133c with adm5120 processor
I followed instructions found here:
http://linux-adm5120.sourceforge.net/openwrt/i2c/
and things seems easy ... but it don't work !
especially in kernel configuration section of the above pageI'm unable to find the i2c-gpio-custom driver in kernel_menuconfig menus
moreover the kernel command line in the compiled kernel never include the option i added... the compile process seems to discard it !
if i add it manually (editing the compiled kernel with an hex editor) i get a message "unknown boot option i2c-gpio-custom..." at boot time

what is wrong ?

please help me ... i'm trying it since 5 days ! (in spare time naturally...)

thanks

ok ... found
i2c-gpio and i2c-gpio-custom must be loaded both ... some instruction wasn't clear about this
moreover the insmod sequence is important !

compiled all as module
then:
insmod i2c-core
insmod-i2c.algo-bit
insmod i2c-dev
insmod i2c-gpio-custom bus0=0,14,15
insmod i2c-gpio

then it works great !