Yocto:将内核模块配方添加到映像，但是在启动时不会加载 [英] Yocto: Adding kernel module recipe to image, but it doesn't load on boot

问题描述

出于测试目的，我使用yocto提供的示例配方来演示如何构建内核模块.

For testing purposes, I am using the example recipe provided by yocto to demonstrate how to build kernel modules.

SUMMARY = "Example of how to build an external Linux kernel module"
LICENSE = "GPLv2"
LIC_FILES_CHKSUM = "file://COPYING;md5=12f884d2ae1ff87c09e5b7ccc2c4ca7e"

inherit module

PR = "r0"
PV = "0.1"

SRC_URI = "file://Makefile \
           file://hello.c \
           file://COPYING \
          "

S = "${WORKDIR}"

# The inherit of module.bbclass will automatically name module packages with
# "kernel-module-" prefix as required by the oe-core build environment.

hello.c文件非常简单.

#include <linux/module.h>

int init_module(void)
{
    printk("Hello World!\n");
    return 0;
}

void cleanup_module(void)
{
    printk("Goodbye Cruel World!\n");
}

MODULE_LICENSE("GPL");

现在，我将此模块添加到了我的图像配方中.

Now, I added this module to my image recipe.

SUMMARY = "A console-only image that fully supports the target device \
hardware."

IMAGE_FEATURES += "splash package-management"

IMAGE_INSTALL += "test-mod autoconf automake binutils make busybox"

LICENSE = "MIT"

inherit core-image

启动映像时，在/lib/modules目录中看到测试"hello.ko"，但是当我检查dmesg时，看不到指示内核模块已加载的输出.

When I boot the image, I see the test "hello.ko" in the /lib/modules directory, but when I check dmesg, I don't see the output indicating the kernel module loaded.

当我在hello.ko上手动运行insmod时，得到了输出.另外，当我运行rmmod时，我得到了输出.

When I manually run insmod on hello.ko, I get the output. Also, when I run rmmod, I get the output.

我做错了什么?我需要这个模块在启动时自动加载.

What am I doing wrong? I need this module to auto load on boot.

修改:

在此处显示输出，验证该模块在引导时未加载，但它是有效的模块.

Here the output, verifying that the module isn't loaded on boot, but it is a valid module.

/ # dmesg | grep "Hello"
/ # insmod hello.ko 
[   68.503689] Hello World!
/ # rmmod hello.ko 
[   72.702035] Goodbye Cruel World!

推荐答案

您应该将模块名称添加到

You should add your module name to KERNEL_MODULE_AUTOLOAD in your recipe, typically like this:

KERNEL_MODULE_AUTOLOAD += "hello"

这应该将您的模块名称放入映像上的/etc/modules-load.d/modname.conf中.

This should put your module name into /etc/modules-load.d/modname.conf on the image.

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