[yocto] How to select defconfig for kernel build with yocto/bitbake

[Bruce Ashfield]

On 14-07-10 07:11 AM, Dr. Markus Eich wrote:
> Thank you Bruce, that did the trick. But I am facing a new problem while
> using bitbake for the build process.
>
> I have checked to build the odroid kernel with a standard crosscompiler
> tool chain and it works without any problems.
>
> When I do the same with the bitbake toolchain (bitbake virtual/kernel),
> it somehow creates a recursive link in the folder
>
> package/usr/src/kernel/drivers/gpu/arm/mali400/ump/arch/arch-release ->
> arch-release
>
> This causes a crash in the build system.
>
> Compilation runs fine though. This error seems to be within do_package.
> I have removed the link, but somehow it is created automatically.
>
> Any ideas?

Nothing off the top of my head. That link would be created by the kernel
build, and not by bitbake or the oe-core kernel build classes.

I'd start by looking at the kernel's makefiles and seeing where the
link is being created.

Do specific tasks work ? i.e. is that happening during unpack/patch, or
during compilation.

Bruce

>
> /Markus
>
>
>
> On 09.07.2014 14:44, Bruce Ashfield wrote:
>> On 14-07-09 05:38 AM, Dr. Markus Eich wrote:
>>> Dear all,
>>>
>>> I work on the process to compile odroid xu kernel with yocto/bitbake
>>>
>>> In the kernel sources (from hardkernel) I have the corresponding
>>> defconfig file, i.e. in the git folder
>>> /arch/arm/configs/odroidxu_ubuntu_defconfig.
>>>
>>> How can I tell bitbake in my recipe to use "odroidxu_ubuntu_defconfig"?
>>
>> To trigger the oe-core kernel processing to use the defconfig, you need
>> to put that defconfig in your SRC_URI.
>>
>> Which means you should grab a copy of that from the kernel tree, and
>> in the same directory structure as your kernel recipe.
>>
>> See meta-skeleton/recipes-kernel/linux/linux-yocto-custom.bb for an
>> example.
>>
>> Cheers,
>>
>> Bruce
>>
>>
>>>
>>> My recipe looks as follow:
>>>
>>> ===
>>> require recipes-kernel/linux/linux-yocto.inc
>>>
>>> KERNEL_IMAGETYPE = "uImage"
>>>
>>> COMPATIBLE_MACHINE = "odroid-xu"
>>>
>>> LINUX_VERSION = "3.4.91"
>>> LINUX_VERSION_EXTENSION = "-custom"
>>>
>>> FILESEXTRAPATHS_prepend := "${THISDIR}/linux-hardkernel-3.4:"
>>>
>>> S = "${WORKDIR}/git"
>>>
>>> # from where to fetch the kernel
>>> KERNEL_REPO_OWNER ??= "hardkernel"
>>> KERNEL_REPO_URI ??= "git://github.com/${KERNEL_REPO_OWNER}/linux.git"
>>> KBRANCH = "odroidxu-3.4.y"
>>>
>>> SRCREV = "${AUTOREV}"
>>>
>>> KV = "3.4.91"
>>> PV = "${KV}+gitr${SRCPV}"
>>> LOCALVERSION ?= ""
>>>
>>>
>>> SRC_URI = " \
>>>    ${KERNEL_REPO_URI};nocheckout=1;branch=${KBRANCH} \
>>> "
>>>
>>> PACKAGES =+ "kernel-headers"
>>> FILES_kernel-headers = "${exec_prefix}/src/linux*"
>>> ===
>>>
>>> Cheers,
>>>
>>> Markus
>>>
>>>
>>>
>>>
>>
>