[yocto] KBUILD_DEFCONFIG_KMACHINE not used anywhere

[Alan Martinovic]

>
> What is your kernel recipe ? Something you wrote, or something
> from a vendor ?


Something I inherited.
It does seem to have been based on linux-yocto-custom.bb.


SECTION = "kernel"
DESCRIPTION = "Mainline Linux kernel"
LICENSE = "GPLv2"
LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"

COMPATIBLE_MACHINE = "(senic-hub-beta|senic-hub)"

inherit kernel
require recipes-kernel/linux/linux-yocto.inc

KBRANCH = "senic/4.13"
SRCREV = "e469b218af6fe7cb8c50c4395ae9f3204f8033ae"

PV = "4.13+git${SRCPV}"
S = "${WORKDIR}/git"

KBUILD_DEFCONFIG_senic-hub-beta="senic_defconfig"

SRC_URI = "git://
github.com/TheMeaningfulEngineer/senic-os-linux.git;nobranch=1;protocol=git;branch=${KBRANCH}
\
          "


Running it with:

bitbake -v linux-senic


It fails with:

ERROR: linux-senic-4.13+gitAUTOINC+e469b218af-r0 do_kernel_configme: Could
not configure senic-hub-beta-standard
ERROR: linux-senic-4.13+gitAUTOINC+e469b218af-r0 do_kernel_configme:
Function failed: do_kernel_configme (log file is located at
/home/alan/senic-o
s/build/tmp-glibc/work/senic_hub_beta-senic-linux-gnueabi/linux-senic/4.13+gitAUTOINC+e469b218af-r0/temp/log.do_kernel_configme.5641)

ERROR: Logfile of failure stored in:
/home/alan/senic-os/build/tmp-glibc/work/senic_hub_beta-senic-linux-gnueabi/linux-senic/4.13+gitAUTOINC+e469b2
18af-r0/temp/log.do_kernel_configme.5641


Not sure when "-standard" got appended...?
A more exact error seems to be:

linux-senic-4.13+gitAUTOINC+e469b218af-r0 do_kernel_configme: +
configs=[ERROR]: no configuration queue found in outdir (.kernel-meta)


Could it be expecting a "linux-yocto style" with the meta branches?




On Tue, Nov 7, 2017 at 6:47 PM, Bruce Ashfield <bruce.ashfield at windriver.com
> wrote:

> On 11/07/2017 08:46 AM, Alan Martinovic wrote:
>
>> Hi,
>> I'm trying to get yocto to build the kernel with an in-tree defconfig.
>> For that I found references to the variable KBUILD_DEFCONFIG_KMACHINE.
>>
>> However, I've been experiencing that the kernel is being built with
>> some default defconfig, and not the in-tree one that came with the
>> kernel and I defined with the KBUILD_DEFCONFIG_KMACHINE.
>>
>> I've looked through all yocto sources for where the
>> KBUILD_DEFCONFIG_KMACHINE is actually used, and found it only in my
>> kernel recipe. So I decided to dissect my recipe.
>>
>
> What is your kernel recipe ? Something you wrote, or something
> from a vendor ?
>
>
>
>> There is a:
>>
>> inherit kernel
>>
>> in my recipe for which, besides others, defines how the kernel config
>> will be selected.
>> Looking at the sources of oe/meta/classes/kernel.bbclass exposes how
>> the kernel configuration happens:
>>
>> kernel_do_configure() {
>>          # fixes extra + in /lib/modules/2.6.37+
>>          # $ scripts/setlocalversion . => +
>>          # $ make kernelversion => 2.6.37
>>          # $ make kernelrelease => 2.6.37+
>>          touch ${B}/.scmversion ${S}/.scmversion
>>
>>          if [ "${S}" != "${B}" ] && [ -f "${S}/.config" ] && [ ! -f
>> "${B}/.config" ]; then
>>                  mv "${S}/.config" "${B}/.config"
>>          fi
>>
>>          # Copy defconfig to .config if .config does not exist. This
>> allows
>>          # recipes to manage the .config themselves in
>> do_configure_prepend().
>>          if [ -f "${WORKDIR}/defconfig" ] && [ ! -f "${B}/.config" ]; then
>>                  cp "${WORKDIR}/defconfig" "${B}/.config"
>>          fi
>>
>>          ${KERNEL_CONFIG_COMMAND}
>> }
>>
>>
>> I'm planning a workaround by overriding the do_configure in my recipe
>> to select the correct defconfig from the kernel. It does seem however
>> like the KBUILD_DEFCONFIG_KMACHINE is exactly here to not have to do
>> the workarounds.
>>
>> Anyone has experiences with successfully using KBUILD_DEFCONFIG_KMACHINE?
>> Is it a specific poky feature (I'm not using poky but specific open
>> embedded layers and bitbake)?
>>
> That is a feature of kernel-yocto, so if your recipe is inheriting
> kernel-yocto you can use what you are looking for.
>
> But note, in the documentation you are referencing you have to replace
> KMACHINE with your actual machine .. not use the string KMACHINE.
>
> i.e. in your recipe (or bbappend)
>
> # for cases where the KMACHINE (KERNEL MACHINE) and bitbake
> # machine match, just do this:
> KMACHINE=$MACHINE
>
> KBUILD_DEFCONFIG_${KMACHINE}="your defconfig"
>
> i.e. it is just a standard bitbake variable with a machine OVERRIDE
> to make it specific to the machine you are building.
>
> Bruce
>
>
>
>> Be Well,
>> Alan
>>
>> Ref.
>> https://www.yoctoproject.org/docs/2.2/kernel-dev/kernel-dev.
>> html#using-an-in-tree-defconfig-file
>>
>>
>
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