A20核心編譯錯誤undefined reference to `hwmon_device_register

編譯A20核心時出現如下錯誤
http://blog.csdn.net/smilefyx/article/details/38959895

編譯A20核心時出現如下錯誤

drivers/built-in.o: In function `axp20_init_chip':
/home/linux-sunxi/drivers/power/axp_power/axp20-mfd.h:149: undefined reference to `hwmon_device_register'
drivers/built-in.o: In function `axp_mfd_remove':
/home/linux-sunxi/drivers/power/axp_power/axp-mfd.c:368: undefined reference to `hwmon_device_unregister'
make: *** [.tmp_vmlinux1] Error 1

其原因時在核心配置時配置了CONFIG_AXP_HWMON=y但是CONFIG_HWMON沒有配置或配置成了m，解決辦法時修改.config，將CONFIG_HWMON配置為y，即

vi .config
修改：
CONFIG_HWMON=y