[yocto] Meta Intel / Cedartrail / Denzil - how to get unionfs in the kernel

[Bruce Ashfield]

On Sun, Oct 7, 2012 at 6:08 PM, Chris Tapp <opensource at keylevel.com> wrote:
> On 7 Oct 2012, at 03:00, Saxena, Rahul wrote:
>
>> Try adding the unionfs feature (below) to your kernel:
>>
>> http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-3.0/tree/meta/cfg/kernel-cache/features/unionfs?h=meta
>>
>> create a file my_cedartrail.scc with following line:
>> include features/unionfs/unionfs.scc
>>
>> put this file in a dir linux-yocto, the dir being created in
>>
>> meta-cedartrail/recipes-kernel/linux
>>
>> add following line in  meta-cedartrail/recipes-kernel/Linux/linux-yocto_3.0.bbappend
>>
>> SRC_URI +="file://my_cedartrail.scc"
>
> Thanks - I thought just running 'menuconfig' would allow me to enable it (for a quick test).
>
> However, this still doesn't seem to be working. I can see that 'my_cedartrail.scc' gets fetched in to the build area, but I still don't see CONFIG_UNION_FS if I run 'menuconfig'. There is also no 'unionfs' folder in fs/ of the build tree.
>
> Also, if I specify an invalid feature (e.g. feature2/unionfs/unionfs.scc) I'm not seeing any diagnostic.

unionfs was never merged to the 3.0 kernel, I re-added it to the development
trees for 3.2 and the 3.4 kernel (aufs for the 3.6 tree at the moment). The meta
data is carried forward from the older kernels as a placeholder and is
documented
in the .scc file itself:

-----------------------
kconf non-hardware unionfs.cfg

# commented pending update to a newer version ported to 2.6.35+
# patch unionfs-2.5.4-integration.patch
-----------------------

So to get unionfs in the 3.0 kernel, we'd need a port .. but since
we've moved on
quite a bit past 3.0, I don't know of any pending ports myself.

Cheers,

Bruce

>
>>
>> -----Original Message-----
>> From: yocto-bounces at yoctoproject.org [mailto:yocto-bounces at yoctoproject.org] On Behalf Of Chris Tapp
>> Sent: Saturday, October 06, 2012 5:43 PM
>> To: yocto at yoctoproject.org Project
>> Subject: [yocto] Meta Intel / Cedartrail / Denzil - how to get unionfs in the kernel
>>
>> I' trying to enable unionfs in the 3.0.32 kernel for the cedartrail BSP under Denzil 7.0.1.
>>
>> However, the CONFIG_UNION_FS config flag isn't in the .config ...
>>
>> Is there something else I need to enable, or do I need to find another way?
>>
>> Chris Tapp
>>
>> opensource at keylevel.com
>> www.keylevel.com
>>
>>
>>
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>> yocto mailing list
>> yocto at yoctoproject.org
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>
> Chris Tapp
>
> opensource at keylevel.com
> www.keylevel.com
>
>
>
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