Hi Zoran, There are two ways to do this
1. Build using a bb recipe. Take a look at meta-skeleton/recipes-kernel/hello-mod for an example. You just need to add meta-skeleton to your bblaysers.conf and then bitbake hello-mod 2. Build from the SDK: First, add the kernel source to the SDK by adding this to conf/local/conf TOOLCHAIN_TARGET_TASK_append = " kernel-devsrc" Then build the SDK bitbake -c populate_sdk [your image recipe] Once the SDK is installed, generate the kernel headers: sudo -i . /opt/poky/2.6.2/environment-setup-cortexa8hf-neon-poky-linux-gnueabi cd /opt/poky/2.6.2/sysroots/cortexa8hf-neon-poky-linux-gnueabi cd /usr/src/kernel make oldconfig scripts exit Finally, build your module using a Makefile like this obj-m := hello-mod.o all: make -C $(SDKTARGETSYSROOT)/usr/src/kernel M=$(shell pwd) HTH, Chris On 12/05/2019 11:53, Zoran Stojsavljevic wrote: > Hello to the YOCTO community, > > I am using (to build the target for Beagle Bone Black) the following script: > https://github.com/ZoranStojsavljevic/bbb-yocto > https://github.com/ZoranStojsavljevic/bbb-yocto/blob/master/bbb-yocto.sh > > The latest kernel I am using from the following repo: > https://github.com/jumpnow/meta-bbb > > Is kernel 5.0.14 . > > Here is the snippet of the boot traces: > Starting kernel ... > > [ 0.000000] Booting Linux on physical CPU 0x0 > [ 0.000000] Linux version 5.0.14-jumpnow (oe-user@oe-host) (gcc > version 8.3.0 (GCC)) #1 Fri May 10 13:12:33 UTC 2019 > [ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d > [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing > instruction cache > [ 0.000000] OF: fdt: Machine model: TI AM335x BeagleBone Black > [ 0.000000] Memory policy: Data cache writeback > [ 0.000000] cma: Reserved 16 MiB at 0x9f000000 > [ 0.000000] CPU: All CPU(s) started in SVC mode. > [ 0.000000] AM335X ES2.1 (sgx neon) > [ 0.000000] random: get_random_bytes called from > start_kernel+0xa4/0x460 with crng_init=0 > [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 130048 > [ 0.000000] Kernel command line: console=ttyO0,115200n8 > root=/dev/ram0 ip=dhcp > > According to the documentation, the following: > 2.10.1. Building Out-of-Tree Modules on the Target > https://www.yoctoproject.org/docs/latest/kernel-dev/kernel-dev.html > > I tried to find /usr/src/kernels/5.0.14... Directory, since I see > from the build that kernel-dev and kernel-devsrc are included: > [user@fedora29-ssd bbb-yocto]$ bitbake -s | grep kernel > core-image-kernel-dev :1.0-r0 > kernel-devsrc :1.0-r0 > kernel-selftest :1.0-r0 > > THE PROBLEM: But I could not find ob BBB target /usr/src/kernels > directory at all!? > > Two questions here? > [1] Do you have any advice on this problem (what I am missing here)? > [2] Alternative to [1]: how I can use cross compiler from > .../build/tmp to build Out-of-Tree Module for the BBB target on the > host? > > Thank you, > Zoran > _______ > -- Chris Simmonds, trainer and consultant at 2net http://www.2net.co.uk Author of "Mastering Embedded Linux Programming" -- _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto