在编译内核时构建/lib/modules/$(uname -r)/build [英] building /lib/modules/$(uname -r)/build while compiling a kernel

问题描述

我正在为嵌入式设备交叉编译3.4.0内核.然后，我想安装需要/lib/modules/3.4/build目录和子文件的compat-wireless驱动程序.谁能解释我如何建立该目录，以便在执行INSTALL_MOD_PATH=newmodules make modules_install时也可以加载/lib/modules/$(uname -r)/build目录?我希望您能给出清楚的解释.

I am cross-compiling 3.4.0 kernel for an embedded device. Then I would like to install compat-wireless drivers which require /lib/modules/3.4/build directory and sub-files. Could anyone explain how can I build that directory so that when I do INSTALL_MOD_PATH=newmodules make modules_install it would load /lib/modules/$(uname -r)/build directory as well? I would appreciate for a clear explanation.

我正在使用debian发行版.我知道我可以通过apt-get install linux-headers-$(uname -r)安装内核头文件，但是我怀疑这是个好主意，因为内核源代码可能不相同.

I am using debian distro. I know I can install the kernel headers by apt-get install linux-headers-$(uname -r), but I doubt it would be a good idea since the kernel sources might not be identical.

推荐答案

/lib/modules/$(uname -r)/build通常是到执行构建目录的软链接.因此，执行此操作的方法是简单地执行

Typically /lib/modules/$(uname -r)/build is a soft-link to the directory where performed the build. So the way to do this is to simply do a

  make modules_install INSTALL_MOD_PATH=/some/root/

在内核的构建目录中，其中/some/root是您希望交叉编译片段结束的位置.这将在/some/root/lib/modules/$(uname -r)中创建指向您的内核构建路径的链接...验证.

in the build directory of the kernel where /some/root is where you want your cross compile pieces to end up. This will create a link to your kernel build path in /some/root/lib/modules/$(uname -r) ... verify that.

现在，当您构建compat_wireless驱动程序时，使用KLIB_BUILD变量在Makefile中将内核构建目录指定为/some/root(读取Makefile)

Now when you build the compat_wireless drivers specify the kernel build directory in the Makefile as /some/root using the KLIB_BUILD variable (read the Makefile)

make modules KLIB_BUILD=/some/root/lib/modules/$(uname -r)/build 

这应该为您解决问题.

编辑A

回答以下您的评论:

1. 将"newmodules"保留在内核目录之外，将其放在内核目录中是个坏主意.所以mkdir newmodules像/home/foo或/tmp之类的东西.这是构建链接搞砸的原因之一

1. Keep "newmodules" outside the kernel directory it's a bad idea to put it in the the kernel directory. so mkdir newmodules somewhere like /home/foo or /tmp or something. This is one of the reasons your build link is screwed up

ALSO .../build是/to/kernel/build/location的软链接，它将仅作为软链接进行复制.您还需要使用相同的相对位置，将实际的内核源代码/内核构建目录复制到您的microSD上.例如，

ALSO .../build is a soft link /to/kernel/build/location it will only copy over as a soft-link. You also need to copy over the actual kernel source / kernel build directory to your microSD, using the same relative location. For example,

假设您的内核源位于:

  /usr/src/linux-3.5.0/

您的内核构建目录是:

  /usr/src/linux-3.5.0-build/

您的新模块(在以下1.之后)位于:

Your newmodules (after following 1.) is in:

  /tmp/newmodules/

因此，在/tmp/newmodules/下，您会看到安装在树中的模块，如:

So under /tmp/newmodules/ you see the modules installed in a tree like:

      lib/modules/$(uname -r)/

在此目录中执行ls -al时，您会看到该构建是指向以下内容的软链接:

when you do an ls -al in this directory, you'll see that build is a soft link to:

      build -> /usr/src/linux-3.5.0-build/

现在，假设您的microSD安装在/mnt/microSD下

Now let's say your microSD is mounted under /mnt/microSD

然后您需要执行以下操作

then you need to do the following

      mkdir  -p /mnt/microSD/usr/src 
      cp -a /usr/src/linux-3.5.0 /usr/src/linux-3.5.0-build /mnt/microSD/usr/src
      cp -a /tmp/newmodules/lib /mnt/microSD/lib

现在，您拥有将其带到嵌入式环境所需的所有内容.我认为您是在目标系统上进行compat_wireless构建，而不是交叉编译?

Now you have all the content you need to bring over to your embedded environment. I take it you are doing the compat_wireless build on your target system rather than cross compiling it?

如果您的内核版本与内核源代码相同，则只需复制内核源代码，而忽略上述复制说明中的linux-3.5.0-build

If your kernel build is the same as the kernel source then just copy over the kernel source and ignore the linux-3.5.0-build in copy instructions above

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