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Old 05-10-2008, 12:19 PM
Dan Munckton
 
Default PS3 - return to custom flavour or stick with powerpc64-smp?

Hi Kernel Team

The powerpc64-smp multi-platform kernel doesn't work out of the box on
PlayStation 3 despite merging of the cell patches into 2.6.24 upstream.

I now know we're definitely going to need to change certain config
options and apply patches that are either specific to the PS3 or direct
from cell/PS3 kernel team (Geoff Levand et al) [0].

IMO it looks like we'd be better going back to a custom kernel flavour
especially for PS3. That way we avoid potentially upsetting the
stability of the other powerpc kernels and it would allow us some
freedom to optimise for our specialised environment.

It may be possible in future to return to the power64-smp kernel, I
don't know yet, I've asked Geoff for his opinion on it [1].

So -->

* Does anyone have any objections or opinions on this?

* What are the knock-on effects on general Ubuntu kernel maintenance?

* The current plan [2] is to try and get an installable Hardy on PS3 for
8.04.1. I'm sure I can put together the custom flavour in time but would
it be accepted or are we going to have to focus on the Ibex?

* Would any of the current custom flavour maintainers (lpia, openvz, rt,
xen) be prepared to share their experiences of the
benefits/disadvantages/gotchas of this approach?

* What are the knock-on affects of this on other packages. E.g. I
presume the linux-cell meta-packages would need to be changed, possibly
the installer, most probably the ps3 CD build scripts (wherever they
are?).


Cheers

Dan

[0]
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/220524/comments/10
[1] http://ozlabs.org/pipermail/cbe-oss-dev/2008-May/004748.html
[2] https://wiki.ubuntu.com/UbuntuPS3/HardySchedule


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Old 05-15-2008, 03:52 AM
Ben Collins
 
Default PS3 - return to custom flavour or stick with powerpc64-smp?

On Sat, 2008-05-10 at 13:19 +0100, Dan Munckton wrote:
> Hi Kernel Team
>
> The powerpc64-smp multi-platform kernel doesn't work out of the box on
> PlayStation 3 despite merging of the cell patches into 2.6.24 upstream.
>
> I now know we're definitely going to need to change certain config
> options and apply patches that are either specific to the PS3 or direct
> from cell/PS3 kernel team (Geoff Levand et al) [0].
>
> IMO it looks like we'd be better going back to a custom kernel flavour
> especially for PS3. That way we avoid potentially upsetting the
> stability of the other powerpc kernels and it would allow us some
> freedom to optimise for our specialised environment.
>
> It may be possible in future to return to the power64-smp kernel, I
> don't know yet, I've asked Geoff for his opinion on it [1].
>
> So -->
>
> * Does anyone have any objections or opinions on this?

For hardy, this is pretty much not an option.

> * What are the knock-on effects on general Ubuntu kernel maintenance?
>
> * The current plan [2] is to try and get an installable Hardy on PS3 for
> 8.04.1. I'm sure I can put together the custom flavour in time but would
> it be accepted or are we going to have to focus on the Ibex?

For now, I'd concentrate on intrepid. PowerPC is an unmaintained port in
hardy, so post-release updates are not going to get priority, and in
most cases wont be accepted.

> * Would any of the current custom flavour maintainers (lpia, openvz, rt,
> xen) be prepared to share their experiences of the
> benefits/disadvantages/gotchas of this approach?

I would rather not take on custom flavours for this. If there are bugs
preventing the multi-arch powerpc64-smp kernel from working (which it
was in gutsy), then those should be fixed.

> * What are the knock-on affects of this on other packages. E.g. I
> presume the linux-cell meta-packages would need to be changed, possibly
> the installer, most probably the ps3 CD build scripts (wherever they
> are?).

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Old 05-17-2008, 09:44 AM
Dan Munckton
 
Default PS3 - return to custom flavour or stick with powerpc64-smp?

Hi Ben

On Wed, 2008-05-14 at 23:52 -0400, Ben Collins wrote:
> > * The current plan [2] is to try and get an installable Hardy on PS3 for
> > 8.04.1. I'm sure I can put together the custom flavour in time but would
> > it be accepted or are we going to have to focus on the Ibex?
>
> For now, I'd concentrate on intrepid. PowerPC is an unmaintained port in
> hardy, so post-release updates are not going to get priority, and in
> most cases wont be accepted.

Ok I understand. To be honest I'd be happy to focus on Intrepid if
that's the path of least resistance.

> 
> > * Would any of the current custom flavour maintainers (lpia, openvz, rt,
> > xen) be prepared to share their experiences of the
> > benefits/disadvantages/gotchas of this approach?
>
> I would rather not take on custom flavours for this. If there are bugs
> preventing the multi-arch powerpc64-smp kernel from working (which it
> was in gutsy), then those should be fixed.

Agreed. So then, I need to get BenH's patch into a kernel build and
subsequently onto an Intrepid PS3 daily live so that we start testing
the installer. Would you accept his patch [0] (which works fine without
needing to modify the existing Hardy powerpc config) into the Intrepid
kernel just now? Or should we change the config options recommended by
Geoff [1] (not yet tested by me)?

Also the upstream Cell team recommend using only 9MB for the ps3fb [2]
so I'd like to change that too if possible.

Any news on getting that PS3 repo on kernel.ubuntu.com that I could
start pushing changes to? I realise you're probably busy getting ready
for UDS, so just let me know when it'll be possible.

Thanks

Dan

[0] http://patchwork.ozlabs.org/linuxppc/patch?q=vmemmap&id=18232
[1] http://ozlabs.org/pipermail/cbe-oss-dev/2008-May/004721.html
[2] http://ozlabs.org/pipermail/cbe-oss-dev/2008-May/004790.html


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