hi
i am using ubuntu 22.04.4 LTS, bitbake 2.8.0, poky scarthgap branch and
beaglebone black. I am trying to create my first device driver and integrate it
in the kernel (with patch).
I am executing the following steps and the result is either that the image is
built but doesnt contain the driver or an error is generated during compiling.
The steps are:
1. i am creating a folder with name tabdriver in the path
/poky/build/tmp/work-shared/beaglebone-yocto/kernel-source/drivers/char/
2. I am creating Kconfig, Makefile and tabdriver.c files in this folder.
Kconfig
===========
config TAB_DRIVER
tristate "CG Hello World Driver"
help
CG help
===========
Makefile
=======
obj-$(CONFIG_TAB_DRIVER) := tabdriver.o
=======
3. in Kconfig which is located in the folder
poky/build/tmp/work-shared/beaglebone-yocto/kernel-source/drivers/char, the
following line is added:
source "drivers/char/tabdriver/Kconfig"
4. in Makefile which is located in the folder
poky/build/tmp/work-shared/beaglebone-yocto/kernel-source/drivers/char, the
following line is added:
obj-$(CONFIG_TAB_DRIVER) += tabdriver/
5. A patch is created by using git git format-patch HEAD~1 which contains the
changes in the file files above
6. The patch is copied in the location
poky/meta-mylayer/recipes-kernel/linux/linux-yocto
7. The file linux-yocto_6.6.bbappend which is located in the location
poky/meta-mylayer/recipes-kernel/linux has the content
======
FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
SRC_URI += "file://0001-tab-char-driver.patch"
======
8. Run bitbake -c cleansstate virtual/kernel
9. Run bitbake -c menuconfig virtual/kernel
10. The new driver is appearing in menu config and i am activating it
11. Run bitbake -c diffconfig virtual/kernel
12. Build image bitbake core-image-full-cmdline
Are the steps that i am following correct?
is there any debug procedure i can follow?
Br
Christos
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