r3 and bd_t

r3 and bd_t

[Andrew Dixon]

Hi All -

I'm trying to boot linux on an sbc8260 using PPCBoot.  (Linux 2.4.16 and
PPCBoot 1.1.2)  PPCBoot passes a data structure (bd_t) with a lot of
board information in it.  The way that this is supposed to work (I
think, please correct me if I'm wrong) is that PPCBoot leaves the
address of the data structure in r3 and one of the first things that
linux should do is to copy or obtain this information somehow.  So, my
question is this: does anyone know where this happens in the code?  I've
been looking in arch/ppc/kernel/setup.c and this looks like where it
should happen but I don't see it.

Any help would be greatly appreciated.

Thanks,
Andy

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Re: r3 and bd_t

[Tom Rini]

On Tue, Dec 11, 2001 at 01:24:11PM -0500, Andrew Dixon wrote:
>
> Hi All -
>
> I'm trying to boot linux on an sbc8260 using PPCBoot.  (Linux 2.4.16 and
> PPCBoot 1.1.2)  PPCBoot passes a data structure (bd_t) with a lot of
> board information in it.  The way that this is supposed to work (I
> think, please correct me if I'm wrong) is that PPCBoot leaves the
> address of the data structure in r3 and one of the first things that
> linux should do is to copy or obtain this information somehow.  So, my
> question is this: does anyone know where this happens in the code?  I've
> been looking in arch/ppc/kernel/setup.c and this looks like where it
> should happen but I don't see it.

arch/ppc/kernel/head_8xx.S saves this and passes it onto early_init()
iirc, which will pass it along to platform_init(), which copies it for
safe keeping.

--
Tom Rini (TR1265)
http://gate.crashing.org/~trini/

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Re: r3 and bd_t

[jtm]

On Tue, Dec 11, 2001 at 11:34:30AM -0700, Tom Rini wrote:
>

> arch/ppc/kernel/head_8xx.S saves this and passes it onto early_init()
> iirc, which will pass it along to platform_init(), which copies it for
> safe keeping.

I think the 8260 uses arch/ppc/kernel/head.S instead of head_8xx.S.

--
Jay Monkman	    The truth knocks on the door and you say "Go away, I'm
monkman@jump.net    looking for the truth," and so it goes away. Puzzling.
		     - from _Zen_and_the_Art_of_Motorcycle_Maintenance_

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Re: r3 and bd_t

[Matt Porter]

On Wed, Dec 12, 2001 at 11:14:57AM -0600, jtm@smoothsmoothie.com wrote:
>
> On Tue, Dec 11, 2001 at 11:34:30AM -0700, Tom Rini wrote:
> >
>
> > arch/ppc/kernel/head_8xx.S saves this and passes it onto early_init()
> > iirc, which will pass it along to platform_init(), which copies it for
> > safe keeping.
>
> I think the 8260 uses arch/ppc/kernel/head.S instead of head_8xx.S.

It has to, it's a 603 core.

--
Matt Porter
MontaVista Software, Inc.
mporter@mvista.com

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Re: r3 and bd_t

[Tom Rini]

On Wed, Dec 12, 2001 at 11:14:57AM -0600, jtm@smoothsmoothie.com wrote:
> On Tue, Dec 11, 2001 at 11:34:30AM -0700, Tom Rini wrote:
> >
>
> > arch/ppc/kernel/head_8xx.S saves this and passes it onto early_init()
> > iirc, which will pass it along to platform_init(), which copies it for
> > safe keeping.
>
> I think the 8260 uses arch/ppc/kernel/head.S instead of head_8xx.S.

Er, yes.  Sorry, i thought the question was about 8xx not 8260.

--
Tom Rini (TR1265)
http://gate.crashing.org/~trini/

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Re: r3 and bd_t

[Jim Thompson]

>> arch/ppc/kernel/head_8xx.S saves this and passes it onto early_init()
>> iirc, which will pass it along to platform_init(), which copies it for
>> safe keeping.
>
> I think the 8260 uses arch/ppc/kernel/head.S instead of head_8xx.S.

And the 8245?


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Re: r3 and bd_t

[Matt Porter]

On Wed, Dec 12, 2001 at 04:57:11PM -0600, Jim Thompson wrote:
>
> >> arch/ppc/kernel/head_8xx.S saves this and passes it onto early_init()
> >> iirc, which will pass it along to platform_init(), which copies it for
> >> safe keeping.
> >
> > I think the 8260 uses arch/ppc/kernel/head.S instead of head_8xx.S.
>
> And the 8245?

head.S handles classic PPC cores (6xx/7xx/74xx/82xx).
head_4xx.S and head_8xx.S are obvious then.

--
Matt Porter
MontaVista Software, Inc.
mporter@mvista.com

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Re: r3 and bd_t

[Tom Rini]

On Wed, Dec 12, 2001 at 04:57:11PM -0600, Jim Thompson wrote:
> >> arch/ppc/kernel/head_8xx.S saves this and passes it onto early_init()
> >> iirc, which will pass it along to platform_init(), which copies it for
> >> safe keeping.
> >
> > I think the 8260 uses arch/ppc/kernel/head.S instead of head_8xx.S.
>
> And the 8245?

arch/ppc/kernel/head.S as well.

--
Tom Rini (TR1265)
http://gate.crashing.org/~trini/

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