Re: [Xenomai-core] [Adeos-main] I-pipe for 2.6.32 PPC

[Philippe Gerum <rpm@xenomai.org>]

On Tue, 2010-01-12 at 12:24 -0500, Lennart Sorensen wrote:
> On Tue, Jan 12, 2010 at 05:03:19PM +0100, Philippe Gerum wrote:
> > On Fri, 2010-01-08 at 12:10 +0100, Philippe Gerum wrote:
> > > On Fri, 2010-01-08 at 11:59 +0100, Richard Cochran wrote:
> > > > On Thu, Dec 10, 2009 at 07:56:28AM +0100, Bernhard Pfund wrote:
> > > > > I'm currently working with a fairly new ppc development board (P2020RDB) by 
> > > > > Freescale. The board's BSP went mainline with 2.6.32 and I'd like to deploy an 
> > > > > I-pipe enabled DENX kernel for testing. Now, is there an I-pipe patch for said 
> > > > > kernel on the release schedule anywhere soon?
> > > > 
> > > > I got ipipe-2.6.30 running the p2020ds with minimal effort. I can post
> > > > a diff if that might help you.
> > > > 
> > > > I should have my own p2020rdb soon...
> > > > 
> > > > I have noticed some unexplained freezes running xenomai programs on
> > > > the p2020ds in SMP mode, but I have not yet had time to look into
> > > > it. I hope we can work together to get SMP working reliably.
> > > 
> > > I'm working on fixing the pipeline for 2.6.32/ppc64, which includes SMP
> > > mode. 32bit looks ok in UP mode, but I still need to validate SMP there.
> > > So it would be great if you could hammer that patch over your P2020 as
> > > well once it's ready. ETA, early next week. I'll keep you informed about
> > > this.
> > 
> > As expected, upgrading from 2.6.30 to 2.6.32 for ppc64 was a real pain.
> > Anyway, here is a patch which applies against 2.6.32.2 mainline; it is
> > pretty large because it also includes DENX-originated bits, from v2.6.32
> > to DENX-v2.6.32.
> > 
> > http://download.gna.org/adeos/patches/tmp/adeos-ipipe-2.6.32.2-powerpc-2.8-00.patch
> > 
> > This is expected to work over Xenomai 2.5.0. Tested over 52xx, 85xx, 4xx
> > for the 32bit support, pasemi for the 64bit part. I did not manage to
> > put my hands on a working ppc32/SMP board to give it a shot yet, so,
> > well, I wish you luck. This said, ppc64/SMP has been validated, so there
> > is hope.
> > 
> > Sidenote: ftrace may induce a massive stack consumption on ppc64 under
> > certain circumstances, causing kernel stack overflows. A way to work
> > around this should be to enable CONFIG_IRQSTACKS, but this won't work
> > with Xenomai over ppc64 yet, albeit this does work over ppc32. 
> > 
> > This patch is in a staging directory for now; waiting for some feedback
> > to go further.
> 
> Any chance of getting it without the DENX bits since some of us really
> really don't care for those and want to apply against Linus's releases
> only.  Having the patch always fail to apply is rather annoying.
> 

It turns out that it really, really annoys me not to have the DENX bits
in when working on embedded powerpc targets, but you do have the option
of cloning git://git.denx.de/ipipe-2.6.git, and diff whatever you see
fit with commit 9d81556f or later.

-- 
Philippe.