Re: [Fastboot] Re: Kexec for booke PPC processors

Re: [Fastboot] Re: Kexec for booke PPC processors

[Michael Ellerman]

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On Thu, 2 Mar 2006 09:43, dagriego wrote:
> I'm finishing my first pass on getting kexec to work on PPC booke
> processor, and needed some insight into how to pass information from the
> first kernel to the kexec'ed kernel.  This information is the board
> information that the first kernel is given in r3 from the board firmware. 
> Is there a standard convention for passing this information?

Yep, it's called the flat device tree.

cheers

-- 
Michael Ellerman
IBM OzLabs

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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Re: [Fastboot] Re: Kexec for booke PPC processors

[Kumar Gala]

> On Thu, 2 Mar 2006 09:43, dagriego wrote:
> > I'm finishing my first pass on getting kexec to work on PPC booke
> > processor, and needed some insight into how to pass information from the
> > first kernel to the kexec'ed kernel.  This information is the board
> > information that the first kernel is given in r3 from the board firmware. 
> > Is there a standard convention for passing this information?
> 
> Yep, it's called the flat device tree.

Which PPC booke are you trying to get this to work on?

- kumar

Re: [Fastboot] Re: Kexec for booke PPC processors

[dagriego]

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I'm working on the E500 core, particularly the mpc8540/8560ADS boards
- David

On 3/1/06, Kumar Gala <galak@kernel.crashing.org> wrote:
>
> > On Thu, 2 Mar 2006 09:43, dagriego wrote:
> > > I'm finishing my first pass on getting kexec to work on PPC booke
> > > processor, and needed some insight into how to pass information from
> the
> > > first kernel to the kexec'ed kernel.  This information is the board
> > > information that the first kernel is given in r3 from the board
> firmware.
> > > Is there a standard convention for passing this information?
> >
> > Yep, it's called the flat device tree.
>
> Which PPC booke are you trying to get this to work on?
>
> - kumar
>
>

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Re: [Fastboot] Re: Kexec for booke PPC processors

[Kumar Gala]

On Mar 2, 2006, at 8:32 AM, dagriego wrote:

> I'm working on the E500 core, particularly the mpc8540/8560ADS boards
> - David

There are patches to u-boot that have been posted to allow mpc8540  
ADS to boot with a flat device tree (needed by kexec).  In addition  
the powerpc.git tree has support in arch/powerpc for building a  
kernel that uses that flat device tree for mpc8540 ads.

I'd recommend you start with getting that going on your system.

- kumar