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

[Chris Tapp]

On 9 Oct 2012, at 14:40, James Abernathy wrote:

> 
> 
> On Mon, Oct 8, 2012 at 12:28 PM, Saxena, Rahul <rahul.saxena at intel.com> wrote:
> 
> 
> -----Original Message-----
> From: Bruce Ashfield [mailto:bruce.ashfield at gmail.com]
> Sent: Monday, October 08, 2012 7:00 AM
> To: Chris Tapp
> Cc: Saxena, Rahul; yocto at yoctoproject.org 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 at keylevel.com> wrote:
> > On 7 Oct 2012, at 22:41, Bruce Ashfield wrote:
> >
> >> 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.
> >
> > 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
> 
> 
> Chris,
> 
> There are no plans to port Cedartrail BSP to support any other Kernel other than 3.0. The reason is that
> the Cedartrail PVR Graphics driver is supported only for 3.0 kernel.
> 
> Rahul
> 
>  
> It may not solve the 3.0 problem for CDV and Yocto, but I noticed that Ubuntu 12.04.1 with the 3.2 kernel supports the PVR driver on it's 3.2.0 kernel.  I've only tested it successfully on an All-In-One with LVDS off of an eDP to LVDS converter used on the DN2800MT motherboard.

Interesting - that's the same board as I'm using. It would be worth seeing what happens. I've had a look at the bbappend for 3.2 that Kishore posted and compared it with the standard one for 3.0. I think it 'just' needs a new meta data branch before I can try a build with pvr. I guess this will need to be a new branch and not an existing one?

>  
> Jim A
>  
> >
> >> 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
> >>>>
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> yocto mailing list
> >>>> yocto at yoctoproject.org
> >>>> https://lists.yoctoproject.org/listinfo/yocto
> >>>
> >>> Chris Tapp
> >>>
> >>> opensource at keylevel.com
> >>> www.keylevel.com
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> yocto mailing list
> >>> yocto at yoctoproject.org
> >>> https://lists.yoctoproject.org/listinfo/yocto
> >>
> >>
> >>
> >> --
> >> "Thou shalt not follow the NULL pointer, for chaos and madness await
> >> thee at its end"
> >
> > Chris Tapp
> >
> > opensource at keylevel.com
> > www.keylevel.com
> >
> >
> >
> 
> 
> 
> --
> "Thou shalt not follow the NULL pointer, for chaos and madness await thee at its end"
> _______________________________________________
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> 

Chris Tapp

opensource at keylevel.com
www.keylevel.com



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