Hello I'm trying to write a loadable kernel module driver. I get an error during compilation: ERROR: modpost: "platform_device_alloc" [/home/rdm/ethtest/eth-ins.ko] undefined! Do I need something to set in the Kernel Config? Helloworld works as LKM.

[NKorn.3]

#include <linux/platform_device.h>

#include <linux/module.h

#include <linux/types.h>

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Robert W. Oliver II");

MODULE_DESCRIPTION("A simple example Linux module.");

MODULE_VERSION("0.01");

static struct platform_device *pdev;

static int __init fake_eth_add(void)

{

  int inst_id = 0;

  pdev = platform_device_alloc("fake-eth", inst_id);

  return 0;

}

static void __exit fake_eth_put(void)

{

}

module_init(fake_eth_add);

module_exit(fake_eth_put);

[Olivier GALLIEN]

Hi @Community member​ 

Did you refer to following wiki page ?

https://wiki.st.com/stm32mpu/wiki/How_to_cross-compile_with_the_Developer_Package#Modifying-2Fadding_an_external_Linux_kernel_module

Such kind of error usually come from bad installation / initialization of the SDK.

Double check your environment.

Hope it help,

Olivier