问题
I follow an example in kernel.org to write an i2c driver but unfortunately when i compile i got this warning
WARNING: "i2c_register_board_info" [/home/pi/builddriver/samplei2c/pn535.ko] undefined!
Although compile with 1 warning and no error, I cannot insmod module. this is error when insmod
insmod: ERROR: could not insert module pn535.ko: Invalid module format
My question is how to solve the warning above?, I think it make .ko file to be invalid. Here is my source code on pastebin
thank for your help!
回答1:
That is not possible in a kernel module simply because the function i2c_register_board_info is not exported from the kernel source tree to the kernel modules (built using obj-m targets). You can achieve this by building your driver within the kernel source tree using (obj-y targets).
来源：https://stackoverflow.com/questions/42945663/build-linux-kernel-module-with-warning-i2c-register-board-info-undefined