How to add a module to android Kernel

Chip Platform Rockchip
1

Hello im new to making modules for android/linux so i apologize if these are obvious questions but ive been having trouble with getting this to work properly.

Ive been trying to add a simple hello module to the android kernel. here are my current steps:
HelloModule.c:

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

static int __init hello_module(void)
{
	printk(KERN_INFO "Hello android kernel...\n");
	return 0;
}

static void __exit goodbye_module(void)
{
printk(KERN_INFO "Goodbye android kernel...\n");
}

module_init(hello_module);
module_exit(goodbye_module);
  1. move hellomodule.c to firefly-rk3399/kernel/drivers/misc/
  2. add to makefile (in misc):
obj-$(CONFIG_HELLO_MODULE)      += HelloModule.o

3.add to Kconfig(in misc):

config HELLO_MODULE
        tristate "Hello Module"
        default y
  1. cd firefly-rk3399/
  2. ./FFtools/make.sh -j32
  3. ./FFtools/mkupdate/mkupdate.sh
  4. sudo upgade_tool uf ./rockdev/Image-rk3399_firefly_box/Firefly-RK3399_Android7.1.1_MP_180106.img

It looks like hellomodule.o was compiled correctly in /misc directory
The diffrences between android kernel and a normal linux kernel have been giving me trouble, So heres my questions:

  1. is there a way to see the installed modules on android adb shell? (lsmod doesnt work )
  2. how do you run hellomodule in this case? (modprobe doesnt work)
  3. im trying to run
make ARCH=arm64 CROSS_COMPILE=?

to make a .ko for hellomodule.c by itselfWhere is the cross compiler for the rk3399 board?