[yocto] Problem building the linux kernel outside source directory for mips

[Bruce Ashfield]

On 13-06-02 09:26 AM, Michael Stickel wrote:
> Hi,
>
> I am new to yocto, so I don't know if this is the right list.

This will work, we also have the linux-yocto at yoctoproject.org kernel
mailing list.

>
> I tried to build a kernel for the MTX-1 platform that uses an AU1500
> which is a MIPS32 based SoC.
> After some work I got the standard kernel (3.8.4) used in poky 9 to work.
> But I encountered some problems:
>
> In poky-dylan-9.0.0/meta/recipes-kernel/linux/linux-yocto.inc the
> builddir is set to
> "${WORKDIR}/linux-${MACHINE}-${LINUX_KERNEL_TYPE}-build", but
> KERNEL_EXTRA_ARGS does not contain O="${B}". How is the the out of
> source build of the kernel meant to work?

Can you elaborate on this ? Are you actually seeing a problem, or
just wondering about the glue ? If it's the glue, kernel-yocto.bbclass
sets:

KBUILD_OUTPUT = "${B}"

For the desired source/binary split.

>
> The task do_kernel_configme trashed my kernel config. This may be
> because defconfig is copied to ${B}/.config and do_kernel_configme is
> executed in ${S} and does not find .config.

Same question as above. This is basic functionality and kernel_configme
is aware of the source/binary split, and has been doing this since
yocto 0.9.

Can you define "trashed" ?

>
> Is the intended behavior of the out of source build for the kernel
> documented.

Everything should be in the kernel-dev manual and the other yocto
project documentation. There's not that much to document, since the
functionality has been unchanged for quite some time and works behind
the scenes for a linux-yocto* based build.

Cheers,

Bruce

>
> BTW: The kernel works and boots the core-image-minimal with usb USB
> Storage as rootfs.
>
> Best regards
> Michael
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