Radix cross Linux

Index: README.in
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+
+How to Build External Modules
+-----------------------------
+
+To build external modules, you must have a prebuilt kernel available that contains
+the configuration and header files used in the build. Also, the kernel must have been
+built with modules enabled.
+
+Radix cross Linux provides a 'kernel-source' package installed here.
+
+This kernel source not ready for build modules out-of-tree because Radix cross Linux
+provides only cross-compiled packages.
+
+To prepare kernel source you have to do following:
+
+    $ cd /usr/src/@KERNEL_SOURCE@
+    $ make oldconfig
+    $ make modules_prepare
+
+ If you are using a Radix cross Linux distribution kernel,
+there will be a 'kernel-source' package for the kernel you are running provided by
+Radix cross Linux distribution.
+
+This will make sure the kernel contains the information required. The target exists
+solely as a simple way to prepare a kernel source tree for building external modules.
+
+NOTE: 'modules_prepare' will not build Module.symvers even if CONFIG_MODVERSIONS is set;
+therefore, a full kernel build needs to be executed to make module versioning work.
+
+
+Command Syntax
+--------------
+
+The command to build an external module is:
+
+    $ make -C <path_to_kernel_src> M=$PWD
+
+The kbuild system knows that an external module is being built due to the 'M=<dir>'
+option given in the command.
+
+To build against the running kernel use:
+
+    $ make -C /lib/modules/`uname -r`/build M=$PWD
+
+Then to install the module(s) just built, add the target 'modules_install' to the command:
+
+    $ make -C /lib/modules/`uname -r`/build M=$PWD modules_install
+
+
+For mode details please look at
+  https://www.kernel.org/doc/html/latest/kbuild/modules.html
+page.