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Commit c96b5e98 authored by Mark Yoder's avatar Mark Yoder Committed by Robert Nelson
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Updating for new kernel

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books/beaglebone-cookbook/07kernel/kernel.rst
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...@@ -36,11 +36,11 @@ Use the following command to determine which kernel you are running: ...@@ -36,11 +36,11 @@ Use the following command to determine which kernel you are running:
.. code-block:: bash .. code-block:: bash
bone$ uname -a bone$ uname -a
Linux beaglebone 3.8.13-bone67 #1 SMP Wed Sep 24 21:30:03 UTC 2014 armv7l Linux beaglebone 5.10.168-ti-r62 #1bullseye SMP PREEMPT Tue May 23 20:15:00 UTC 2023 armv7l GNU/Linux
GNU/Linux GNU/Linux
The *3.8.13-bone67* string is the kernel version. The *5.10.168-ti-r62* string is the kernel version.
To update to the current kernel, ensure that your Bone is on the Internet To update to the current kernel, ensure that your Bone is on the Internet
(:ref:`networking_usb` or :ref:`networking_wired`) and then run the following commands: (:ref:`networking_usb` or :ref:`networking_wired`) and then run the following commands:
...@@ -49,19 +49,29 @@ To update to the current kernel, ensure that your Bone is on the Internet ...@@ -49,19 +49,29 @@ To update to the current kernel, ensure that your Bone is on the Internet
bone$ apt-cache pkgnames | grep linux-image | sort | less bone$ apt-cache pkgnames | grep linux-image | sort | less
... ...
linux-image-3.15.8-armv7-x5 linux-image-5.10.162-ti-r59
linux-image-3.15.8-bone5 linux-image-5.10.162-ti-rt-r56
linux-image-3.15.8-bone6 linux-image-5.10.162-ti-rt-r57
linux-image-5.10.162-ti-rt-r58
linux-image-5.10.162-ti-rt-r59
linux-image-5.10.168-armv7-lpae-x71
linux-image-5.10.168-armv7-rt-x71
linux-image-5.10.168-armv7-x71
linux-image-5.10.168-bone71
linux-image-5.10.168-bone-rt-r71
linux-image-5.10.168-ti-r60
linux-image-5.10.168-ti-r61
linux-image-5.10.168-ti-r62
linux-image-5.10.168-ti-rt-r60
linux-image-5.10.168-ti-rt-r61
linux-image-5.10.168-ti-rt-r62
... ...
linux-image-3.16.0-rc7-bone1
... bone$ sudo apt install linux-image-5.10.162-ti-rt-r59
linux-image-3.8.13-bone60
linux-image-3.8.13-bone61
linux-image-3.8.13-bone62
bone$ sudo apt install linux-image-3.14.23-ti-r35
bone$ sudo reboot bone$ sudo reboot
bone$ uname -a bone$ uname -a
Linux beaglebone 3.14.23-ti-r35 #1 SMP PREEMPT Wed Nov 19 21:11:08 UTC 2014 armv7l Linux beaglebone 5.10.162-ti-rt-r59 #1 SMP PREEMPT Wed Nov 19 21:11:08 UTC 2014 armv7l
GNU/Linux GNU/Linux
...@@ -86,7 +96,7 @@ Solution ...@@ -86,7 +96,7 @@ Solution
--------- ---------
The solution is to run in kernel space by building a kernel module. There are entire The solution is to run in kernel space by building a kernel module. There are entire
`books on writing Linux Device Drivers <http://bit.ly/1Fb0usf>`_. This recipe assumes that `books on writing Linux Device Drivers <https://bootlin.com/doc/books/ldd3.pdf>`_. This recipe assumes that
the driver has already been written and shows how to compile and install it. After you've the driver has already been written and shows how to compile and install it. After you've
followed the steps for this simple module, you will be able to apply them to any other module. followed the steps for this simple module, you will be able to apply them to any other module.
...@@ -105,7 +115,7 @@ Headers for the version of the kernel you're running: ...@@ -105,7 +115,7 @@ Headers for the version of the kernel you're running:
.. code-block:: bash .. code-block:: bash
bone$ sudo apt install linux-headers-``uname -r`` bone$ sudo apt install linux-headers-`uname -r`
.. note:: .. note::
...@@ -136,37 +146,38 @@ Now, compile the kernel module by using the *make* command: ...@@ -136,37 +146,38 @@ Now, compile the kernel module by using the *make* command:
.. code-block:: bash .. code-block:: bash
bone$ make bone$ make
make -C /lib/modules/3.8.13-bone67/build \ make -C /lib/modules/5.10.168-ti-r62/build M=$PWD
SUBDIRS=/home/debian/beaglebone-cookbook-code/07kernel/hello modules make[1]: Entering directory '/usr/src/linux-headers-5.10.168-ti-r62'
make[1]: Entering directory `/usr/src/linux-headers-3.8.13-bone67' CC [M] /home/debian/docs.beagleboard.io/books/beaglebone-cookbook/code/07kernel/hello.o
CC [M] /home/debian/beaglebone-cookbook-code/07kernel/hello/hello.o MODPOST /home/debian/docs.beagleboard.io/books/beaglebone-cookbook/code/07kernel/Module.symvers
Building modules, stage 2. CC [M] /home/debian/docs.beagleboard.io/books/beaglebone-cookbook/code/07kernel/hello.mod.o
MODPOST 1 modules LD [M] /home/debian/host/BeagleBoard/docs.beagleboard.io/books/beaglebone-cookbook/code/07kernel/hello.ko
CC /home/debian/beaglebone-cookbook-code/07kernel/hello/hello.mod.o make[1]: Leaving directory '/usr/src/linux-headers-5.10.168-ti-r62'
LD [M] /home/debian/beaglebone-cookbook-code/07kernel/hello/hello.ko
make[1]: Leaving directory `/usr/src/linux-headers-3.8.13-bone67'
bone$ ls bone$ ls
Makefile hello.c hello.mod.c hello.o Makefile hello.c hello.mod.c hello.o
Module.symvers hello.ko hello.mod.o modules.order Module.symvers hello.ko hello.mod.o modules.order
Notice that several files have been created. Notice that several files have been created.
``hello.ko`` is the one you want. Try a couple of commands with it: ``hello.ko`` is the one you want. Try a couple of commands with it:
.. code-block:: bash .. code-block:: bash
bone$ modinfo hello.ko bone$ modinfo hello.ko
filename: /home/debian/beaglebone-cookbook-code/07kernel/hello/hello.ko filename: /home/debian/host/BeagleBoard/docs.beagleboard.io/books/beaglebone-cookbook/code/07kernel/hello.ko
srcversion: 87C6AEED7791B4B90C3B50C license: GPL
description: Hello World Example
author: Boris Houndleroy
depends: depends:
vermagic: 3.8.13-bone67 SMP mod_unload modversions ARMv7 thumb2 p2v8 name: hello
vermagic: 5.10.168-ti-r62 SMP preempt mod_unload modversions ARMv7 p2v8
bone$ sudo insmod hello.ko bone$ sudo insmod hello.ko
bone$ dmesg | tail -4 bone$ dmesg | tail -4
[419313.320052] bone-iio-helper helper.15: ready [ 377.944777] lm75 1-004a: hwmon1: sensor 'tmp101'
[419313.322776] bone-capemgr bone_capemgr.9: slot #8: Applied #1 overlays. [ 377.944976] i2c i2c-1: new_device: Instantiated device tmp101 at 0x4a
[491540.999431] Loading hello module... [85819.772666] Loading hello module...
[491540.999476] Hello world [85819.772687] Hello, World!
The first command displays information about the module. The *insmod* command inserts the module into the running kernel. The first command displays information about the module. The *insmod* command inserts the module into the running kernel.
If all goes well, nothing is displayed, but the module does print something in the kernel log. The *dmesg* command displays If all goes well, nothing is displayed, but the module does print something in the kernel log. The *dmesg* command displays
...@@ -373,16 +384,26 @@ To download and compile the kernel, follow these steps: ...@@ -373,16 +384,26 @@ To download and compile the kernel, follow these steps:
.. code-block:: bash .. code-block:: bash
host$ git clone https://github.com/RobertCNelson/bb-kernel.git # <1> host$ git clone https://git.beagleboard.org/RobertCNelson/ti-linux-kernel-dev # <1>
host$ cd bb-kernel host$ cd ti-linux-kernel-dev
host$ git tag # <2> host$ git checkout ti-linux-5.10.y # <2>
host$ git checkout 3.8.13-bone60 -b v3.8.13-bone60 # <3> host$ ./build_deb.sh # <3>
host$ ./build_kernel.sh # <4>
.. note::
If you are using a 64 bit Bone, **git checkout ti-linux-arm64-5.10.y**
1. The first command clones a repository with the tools to build the kernel for the Bone. 1. The first command clones a repository with the tools to build the kernel for the Bone.
2. This command lists all the different versions of the kernel that you can build. You'll need to pick one of these. How do you know which one to pick? A good first step is to choose the one you are currently running. *uname -a* will reveal which one that is. When you are able to reproduce the current kernel, go to `Linux Kernel Newbies <http://kernelnewbies.org/>`_ to see what features are available in other kernels. `LinuxChanges <http://bit.ly/1AjiL00>`_ shows the features in the newest kernel and `LinuxVersions <http://bit.ly/1MrIHx3>`_ links to features of previous kernels. 2. When you know which kernel to try, use *git checkout* to check it out.
3. When you know which kernel to try, use *git checkout* to check it out. This command checks out at tag *3.8.13-bone60* and creates a new branch, *v3.8.13-bone60*. This command checks out branch *ti-linux-5.10.y*.
4. *build_kernel* is the master builder. If needed, it will download the cross compilers needed to compile the kernel (`linaro <http://www.linaro.org/>`_ is the current cross compiler). If there is a kernel at ``~/linux-dev``, it will use it; otherwise, it will download a copy to ``bb-kernel/ignore/linux-src``. It will then patch the kernel so that it will run on the Bone. 3. *build_deb.sh* is the master builder. If needed, it will download the cross compilers
needed to compile the kernel (`gcc <https://gcc.gnu.org/>`_ is the current cross compiler).
If there is a kernel at ``~/linux-dev``, it will use it; otherwise,
it will download a copy to ``bb-kernel/ignore/linux-src``.
It will then patch the kernel so that it will run on the Bone.
.. note::
*build_deb.sh* may ask you to install additional files. Just run **sudo apt install *files*** to
install them.
After the kernel is patched, you'll see a screen similar to :ref:`kernel_config_fig`, on which you can configure the kernel. After the kernel is patched, you'll see a screen similar to :ref:`kernel_config_fig`, on which you can configure the kernel.
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