how to install two modules related to EXPORT_SYMBOL on beaglebone

I'm writing a beaglebone driver and for this I need two modules: gpio_module and BBG_module which are related to EXPORT_SYMBOL. In gpio_module.c I wrote

uint8_t GPIO_device(void)
{}
EXPORT_SYMBOL(GPIO_device);

and in BBG_module.c

extern uint8_t GPIO_device(void);
GPIO_device();

added to makefile

    obj-m := gpio-module.o BBG_module.o

    ARCH=arm 
    CROSS_COMPILE=arm-linux-gnueabi-
    KERNELDIR=/usr/src/kernels/linux-4.9.82-ti-r102

   
arm_modules:
    $(MAKE) ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) -C $(KERNELDIR) M=$(shell pwd) modules KBUILD_EXTRA_SYMBOLS=`pwd`/dep/Module.symvers
    echo "bulding module for arm architecture:"

by running the make command, I got two .ko files and a Module.symvers dependency file with all EXPORT_SYMBOLs.

Do I need to send the Module.symvers to the beaglebone too?
Or add something to the makefile and is KBUILD_EXTRA_SYMBOLS=pwd/dep/Module.symvers needed

I'm a beginner and would appreciate any help. Thanks in advance.

Solution

Here is an example Makefile that combines several modules into one:

obj-m := mymodule.o

mymodule-objs := gpio_module.o adc_module.o uart_module.o crc.o

ccflags-y := -I$(src)/include

gpio_module-objs := GPIO_module.o
adc_module-objs := ADC_module.o
uart_module-objs := UART_module.o

ARCH=arm 
CROSS_COMPILE=arm-linux-gnueabi-   
KERNELDIR=~/linux
   
arm_modules:
    $(MAKE) ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) -C $(KERNELDIR) M=$(shell pwd) modules

This Makefile combines several modules into a single module, mymodule.o, while specifying which source files are needed for each module. It also includes the -I$(src)/include flag to search for header files. Please make sure the order of the modules matches the requirements of the dependencies in your project. this despite the fact that GPIO_module.o ADC_module.o contain EXPORT_SYMBOL, which are used in UART_module