-----Original Message-----
From: Bruce Ashfield [mailto:
bruce.ashfield@...]
Sent: Monday, October 08, 2012 7:00 AM
To: Chris Tapp
Cc: Saxena, Rahul;
yocto@... Project
Subject: Re: [yocto] Meta Intel / Cedartrail / Denzil - how to get unionfs in the kernel
On Mon, Oct 8, 2012 at 3:58 AM, Chris Tapp <
opensource@...> wrote:
> On 7 Oct 2012, at 22:41, Bruce Ashfield wrote:
>
>> On Sun, Oct 7, 2012 at 6:08 PM, Chris Tapp <
opensource@...> 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.
>
> Thanks Bruce.
>
> I guess I need to ask the Intel guys if there are any plans to move Cedartrail on from 3.0 ?
It will have to happen post yocto 1.3 (as far as I know), since the
3.0 kernel will be
dropped at that point.
For the short term, it's likely easier to backport/update unionfs than it would be to update the BSP .. but I can't speak for the time to be spent doing it :)
Cheers,
Bruce
