[yocto] Kernel change in YOCTO

[Zoran Stojsavljevic]

Sorry for the noise...

[user at localhost machine]$ pwd
/home/user/projects/poky/meta-yocto-bsp/conf/machine
[user at localhost machine]$ cat genericx86-64.conf
#@TYPE: Machine
#@NAME: Generic X86_64.

#@DESCRIPTION: Machine configuration for generic X86_64 (64-bit) PCs and
servers. Supports a moderately wide range of drivers that should boot and
be usable on "typical" hardware.

DEFAULTTUNE ?= "core2-64"
require conf/machine/include/tune-core2.inc
require conf/machine/include/genericx86-common.inc

*PREFERRED_VERSION_linux-yocto ?= "4.10%"*

SERIAL_CONSOLES_CHECK = "ttyS0"
[user at localhost machine]$

Zoran
_______

On Tue, Sep 26, 2017 at 2:15 PM, Zoran Stojsavljevic <
zoran.stojsavljevic at gmail.com> wrote:

> Hello,
>
> I have a bit dummy question. I have older Pyro distro, compiled for
> qemux86_64. It has there kernel 4.10.17, and there are two interesting
> directories, where one can find definitions of the kernels:
>
> [user at localhost poky]$ find . -name *.bbappend
> ...
> ./meta-yocto-bsp/recipes-kernel/linux/linux-yocto_4.1.bbappend
> ./meta-yocto-bsp/recipes-kernel/linux/linux-yocto_4.10.bbappend
> ./meta-yocto-bsp/recipes-kernel/linux/linux-yocto_4.12.bbappend <<===
> Introduced later
> ./meta-yocto-bsp/recipes-kernel/linux/linux-yocto_4.4.bbappend
> ./meta-yocto-bsp/recipes-kernel/linux/linux-yocto_4.9.bbappend
> ...
>
> And the .bb scripts are located in:
> ./meta/recipes-kernel/linux/linux-yocto-tiny_4.1.bb
> ./meta/recipes-kernel/linux/linux-dummy.bb
> ./meta/recipes-kernel/linux/linux-yocto_4.9.bb
> ./meta/recipes-kernel/linux/linux-yocto_4.1.bb
> ./meta/recipes-kernel/linux/linux-yocto-rt_4.1.bb
> ./meta/recipes-kernel/linux/linux-yocto-dev.bb
> ./meta/recipes-kernel/linux/linux-yocto-rt_4.12.bb
> ./meta/recipes-kernel/linux/linux-generic_4.13.3.bb <<=== Introduced
> later (git HEAD checkout)
> ./meta/recipes-kernel/linux/linux-yocto-tiny_4.9.bb
> ./meta/recipes-kernel/linux/linux-yocto_4.10.bb
> ./meta/recipes-kernel/linux/linux-yocto-tiny_4.4.bb
> ./meta/recipes-kernel/linux/linux-yocto-rt_4.9.bb
> ./meta/recipes-kernel/linux/linux-yocto_4.4.bb
> ./meta/recipes-kernel/linux/linux-yocto_4.12.bb <<=== Introduced later
> ./meta/recipes-kernel/linux/linux-yocto-rt_4.4.bb
> ./meta/recipes-kernel/linux/kernel-devsrc.bb
>
> Whatever I did (introduced kernel_4.12.12 with the same set of the scripts
> from master - different git headers), I was not able to switch kernel while
> building qemux86-64!?
>
> Even at the end (in desperation to understand from where dependencies are
> coming) I deleted .git in poky/, and deleted everything in build/, except
> conf/bbappend.conf and conf/local.conf?!
>
> But still, kernel 4.10.17 is always taken... No idea why?
>
> user at localhost build]$ bitbake -c fetchall core-image-sato
> WARNING: Host distribution "fedora-26" has not been validated with this
> version of the build system; you may possibly experience unexpected
> failures. It is recommended that you use a tested distribution.
> Loading cache: 100% |#############################
> ############################################################
> ########################################################################|
> Time: 0:00:01
> Loaded 1300 entries from dependency cache.
> NOTE: Resolving any missing task queue dependencies
>
> Build Configuration:
> BB_VERSION        = "1.34.0"
> BUILD_SYS         = "x86_64-linux"
> NATIVELSBSTRING   = "universal"
> TARGET_SYS        = "x86_64-poky-linux"
> MACHINE           = "qemux86-64"
> DISTRO            = "poky"
> DISTRO_VERSION    = "2.3.1"
> TUNE_FEATURES     = "m64 core2"
> TARGET_FPU        = ""
> meta
> meta-poky
> *meta-yocto-bsp    = "<unknown>:<unknown>" <<=== .git deleted prior
> fetching*
>
> Initialising tasks: 100% |#############################
> ############################################################
> ###################################################################|
> Time: 0:00:18
> NOTE: Executing RunQueue Tasks
>
> Summary: There were 11 WARNING messages shown.
> [user at localhost build]$
> _______
>
> Questions:
> [1] Should I blindly follow:
> http://www.yoctoproject.org/docs/2.3.2/kernel-dev/kernel-dev
> .html#creating-and-preparing-a-layer
> Where it is written that new layer must be introduced for the new kernel,
> also (after layer and scripts creation) placed in
> .../build/conf/bbappend.conf?
>
> [2] If [1] is a must, where I can read about reasons why this requirement
> exists?? Maybe BSP and kernel have some invisible dependencies??
>
> [3] Where are these invisible kernel dependencies? So is there something
> (?) kernel depends on, although I always believed that everything else is
> dependent on kernel (kernel is HW dependend via device drivers), since
> kernel lives on its own (except some BSP data - kernel command line passed
> to it at the boot time, which should have no influence on dependency of any
> kind between kernel boot-loader and kernel itself)?!
>
> Thank you,
> Zoran
>
>
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