apt-get source linux-image-$(uname -r) in /usr/src in case you are going to
run your kernel
sudo apt-get build-dep linux-image-$(uname -r)
sudo apt-get install kernel-package
The below stuff did not work, so don't try it.
sudo apt-get install linux-image-rpi-rpfv linux-headers-rpi-rpfv
use rpi-update (do update it)
$ sudo rpi-update
It should give you the latest kernel and then reboot.
After that, Get rpi-source
$ sudo wget https://raw.githubusercontent.com/notro/rpi-source/master/rpi-source -O /usr/bin/rpi-source
$ sudo chmod +x /usr/bin/rpi-source
$ /usr/bin/rpi-source -q --tag-update
$ rpi-source
http://www.howtogeek.com/howto/ubuntu/how-to-customize-your-ubuntu-kernel/
make menuconfig - arrow keys were not working. the issue was with bash.
to make it work, issue sh command and then make menuconfig should work.
sudo apt-get install libqt4-dev
#cd linux-xxx/
#cp /boot/config-uname -r .config
#make xconfig
# make-kpkg clean
$ fakeroot make-kpkg --initrd --append-to-version=-custom kernel_image kernel_headers
two .deb files are generated. one is linux image and other is linux headers.
install both .deb files. those are located in parent dir.
dpkg -i linux.deb and then reboot.
check uname -r after reboot.
Aug 27 01:19:03 ami-desktop kernel: [ 0.000000] Hello to ami's kernel log file to be checked for boot logs: /var/log/kern.log
- locate 2.6.28.9-custom
- delete the files manually and then sudo update-grub2
To uninstall custom kernel, make sure you are not using that kernel currently.
dpkg --list | grep kernel-image
sudo apt-get remove kernel-image-your-kernel-image
To see all the kernels list in grub bootloader screen, press SHIFT key.
insmod hello.ko --> insert the module
lsmode -> list all the loaded modules
rmmod hello -> remove the loaded module if present
modinfo hello.ko -> gives info abt that module
dmesg | tail -f -> to check the printk() output
- how to login as root in ubuntu
first change the password of root (if u r doing it for first time)
sudo passwd root
//change the password
//to login into root, do
su root
All compiled modules are in /lib/modules/uname -r/kernel/drivers/
best one: http://www.tldp.org/LDP/lkmpg/2.6/html/x569.html#AEN687
- http://lwn.net/Kernel/LDD3/
- https://github.com/martinezjavier/ldd3/
- http://lwn.net/Articles/2.6-kernel-api/
- http://opensourceforu.efytimes.com/2015/05/writing-a-basic-framebuffer-driver/
- https://sysplay.in/ -> interesting way
- http://www.tutorialsdaddy.com/2015/05/writing-character-device-driver/
- https://appusajeev.wordpress.com/2011/06/18/writing-a-linux-character-device-driver/
- http://derekmolloy.ie/writing-a-linux-kernel-module-part-1-introduction/
- https://fabiobaltieri.com/2011/09/21/linux-led-subsystem/
- https://0xax.gitbooks.io/linux-insides/content/ --> best one
- http://linux-sunxi.org/SPIdev
- nice doc on writing spi driver - http://invo-tronics.com/spi-driver-for-linux-based-embedded-system/
http://linux.die.net/lkmpg/x892.html https://fabiobaltieri.com/2012/05/20/linux-kernel-device-drivers-for-avr-v-usb-devices/
modinfo module.ko
or
objdump hello-1.ko --full-contents --section=.modinfo
sudo apt-get install mutt
mutt -H 001....path
OR
sudo apt-get install git-email
git format-patch HEAD^
git send-email --to <email address> --cc [email protected] --cc [email protected] --cc [email protected] 001....patch
nice ascii flow diagram: http://asciiflow.com/ useful while sending RFCs
Reference: https://burzalodowa.wordpress.com/2013/10/05/how-to-send-patches-with-git-send-email/
make htmldocs
- kernel module signature loading failed: Add
CONFIG_MODULE_SIG=n
in your module Makefile
- https://events.linuxfoundation.org/sites/events/files/slides/petazzoni-device-tree-dummies.pdf
- install sudo apt install device-tree-compiler @ dtc
cd linux-stable
cp /boot/config-uname -r .config
yes '' | make oldconfig
make menuconfig
make clean
make -j getconf _NPROCESSORS_ONLN deb-pkg LOCALVERSION=-custom
You’ll find your new kernel packages one directory up. They’ll be easily identifiable by their version number
cd ..
sudo dpkg -i linux-firmware-image-4.11.1-custom_4.11.1-custom-1_amd64.deb
sudo dpkg -i linux-libc-dev_4.11.1-custom-1_amd64.deb
sudo dpkg -i linux-headers-4.11.1-custom_4.11.1-custom-1_amd64.deb
sudo dpkg -i linux-image-4.11.1-custom-dbg_4.11.1-custom-1_amd64.deb
sudo dpkg -i linux-image-4.11.1-custom_4.11.1-custom-1_amd64.deb
then reboot
cd linux-src
zcat /proc/config.gz > .config
yes '' | make oldconfig
make menuconfig
make clean
make -j getconf _NPROCESSORS_ONLN LOCALVERSION=-custom
make modules_install
make modules_install
Copy the kernel to /boot directory
cp -v arch/x86_64/boot/bzImage /boot/vmlinuz-linux414
Make initial RAM disk
cp /etc/mkinitcpio.d/linux.preset /etc/mkinitcpio.d/linux414.preset
sudo vim /etc/mkinitcpio.d/linux414.preset
...
ALL_kver="/boot/vmlinuz-linux48"
...
default_image="/boot/initramfs-linux48.img"
...
fallback_image="/boot/initramfs-linux48-fallback.img"
Finally, generate the initramfs images for the custom kernel in the same way as for an official kernel:
mkinitcpio -p linux414
Copy System.map
The System.map file is not required for booting Linux. It is a type of "phone directory" list of functions in a particular build of a kernel. The System.map contains a list of kernel symbols (i.e function names, variable names etc) and their corresponding addresses. This "symbol-name to address mapping" is used by:
cp System.map /boot/System.map-YourKernelName ln -sf /boot/System.map-YourKernelName /boot/System.map
After completing all steps above, you should have the following 3 files and 1 soft symlink in your /boot directory along with any other previously existing files:
Kernel: vmlinuz-YourKernelName
Initramfs: Initramfs-YourKernelName.img
System Map: System.map-YourKernelName
System Map kernel symlink
grub-mkconfig -o /boot/grub/grub.cfg
and then reboot
- pacman -S linux-headers
choose 14) linux-raspberry-headers