Re: RFC: Kexec Cmdline Support

[Uli Luckas <u.luckas@road.de>]

On Tuesday, 25. September 2007, Hans Henry von Tresckow wrote:
> On 9/25/07, Uli Luckas <u.luckas@road.de> wrote:
> > On Monday, 24. September 2007, Hans Henry von Tresckow wrote:
> > > (sorry for crossposting this,but I think more of the interested parties
> > > read oe-devel then angstrom-devel)
> > >
> > > A while back, mwester made some patches to add the ability to modify
> > > the cmdline when using kexec to load a kernel. I did some testing on
> > > poodle
> >
> > and
> >
> > > posted the results on the bug tracker
> > > (http://bugs.openembedded.org/show_bug.cgi?id=2969)
> > > I was wondering what the rest of the developers think of these.
> >
> > Hi Henry,
> > A while back I posted a different approach [1] to this mailing list for
> > review. To bad, there have not been any comments.
> >
> > The differences of my approach in contrast to mwester's approach have
> > been discussed on the arm kernel mailing list. If there is any interest
> > in this (userspace) approach at all, I will improve on the known problems
> > (like hard
> > coded ATAG base address).
> >
> > I'd really appreciate feedback from the developers.
> >
> > Best regerds
> > Uli
> >
> > 1)
> >
> > http://lists.linuxtogo.org/pipermail/openembedded-devel/2007-August/00284
> >0.html
> >
> > --
> >
> > ------- ROAD ...the handyPC Company - - -  ) ) )
> >
> > Uli Luckas
> > Software Development
> >
> > ROAD GmbH
> > Bennigsenstr. 14 | 12159 Berlin | Germany
> > fon: +49 (30) 230069 - 64 | fax: +49 (30) 230069 - 69
> > url: www.road.de
> >
> > Amtsgericht Charlottenburg: HRB 96688 B
> > Managing directors: Hans-Peter Constien, Hubertus von Streit
>
> Uli,
> Do you have a link to the kernel list discussion? 
>
kexec & 2 RAM banks [1] 

> At this point I am more 
> interested in getting cmdline support than in any particular
> implementation. I did try your patch on top of mike's but I had no luck.
>
My Patch is a pure user space implementation and is supposed to work with a 
vanilla kernel. 

> One of the issues I have run into is the BROKEN Sharp bootloader that makes
> things more interesting. Mike's patches can work around this problem by
> setting up a fake ATAG list at a non-standard location.
>
The Idea for both approaches is to take the running kenel's ATAG list as a 
template for the new kernel's ATAG list. Mike Westerhof has this already 
implemented. I kind of stalled on that one as no one showed any interest. If 
you feel like testing such an approach, I could put the missing pieces 
together for you.

> I would love to see more progress on this, since I would like to improve
> support for booting devices from non-standard locations (ie SD card)
> without custom kernels.
>
By the way, who is the original author of the arm-kexec-utils patch? I'd like 
to see kexec support pushed upstream which requires a sign-off of the 
original author.

> Thank you for your help,
>
> Henry von Tresckow (hvontres)

1) kexec & 2 RAM banks
http://marc.info/?l=linux-arm-kernel&m=118554158026945&w=4


-- 

------- ROAD ...the handyPC Company - - -  ) ) )

Uli Luckas
Software Development

ROAD GmbH
Bennigsenstr. 14 | 12159 Berlin | Germany
fon: +49 (30) 230069 - 64 | fax: +49 (30) 230069 - 69
url: www.road.de

Amtsgericht Charlottenburg: HRB 96688 B
Managing directors: Hans-Peter Constien, Hubertus von Streit