RE: Linux boot on a ppc 405

From: "Stephen Neuendorffer" <stephen.neuendorffer@xilinx•com>
To: "Ricardo Ayres Severo" <severo.ricardo@gmail•com>
Cc: linuxppc-embedded@ozlabs•org
Subject: RE: Linux boot on a ppc 405
Date: Mon, 28 Jan 2008 14:55:04 -0800	[thread overview]
Message-ID: <20080128225505.22226C20071@mail131-dub.bigfish.com> (raw)
In-Reply-To: <5ee408090801281453l3e6fe3e5x2f8f1b0b130ad163@mail.gmail.com>

You have to look at the System.map file, find the __log_buf symbol, and
then look at the address manually.

Steve

> -----Original Message-----
> From: linuxppc-embedded-bounces+stephen=3Dneuendorffer.name@ozlabs•org
[mailto:linuxppc-embedded-
> bounces+stephen=3Dneuendorffer.name@ozlabs•org] On Behalf Of Ricardo
Ayres Severo
> Sent: Monday, January 28, 2008 2:53 PM
> Cc: linuxppc-embedded@ozlabs•org
> Subject: Re: Linux boot on a ppc 405
>=20
> Grant,
>=20
> my output is the following:
>=20
> loaded at:     00400000 004E919C
>=20
> board data at: 00000000 0000007C
>=20
> relocated to:  00404040 004040BC
>=20
> zimage at:     00404E2C 004E620A
>=20
> avail ram:     004EA000 8DA05119
>=20
>=20
> Linux/PPC load: console=3DttyUL0,9600
>=20
> Uncompressing Linux...done.
>=20
> Now booting the kernel
>=20
>=20
>=20
> nothing shows up next.
> I tried to look at __log_buf but the debugger doesn't recognize it.
> The debugger only knows the code of the part that boots the kernel.
> I also tried setting ttyUL0 and ttyS0 for the linux console.
> Any ideas of how I can get the real position of __log_buf?
>=20
> Thanks,
>=20
> On Jan 27, 2008 7:15 PM, Grant Likely <grant.likely@secretlab•ca>
wrote:
> > On 1/27/08, Ricardo Severo <severo.ricardo@gmail•com> wrote:
> > > Hi all,
> > >
> > > I am working with a Xilinx Virtex II Pro  evaluation board, wich
has two
> > > PowerPC 405 and I'm trying to boot a vanilla linux kernel
2.6.23.14.
> > > Until now I've manged to make it uncompress the kernel, but it
doesn't boot.
> > > My question is how the initial execution (the one who uncompresses
the
> > > kernel image) transfers the processor to the kernel itself. I've
looked
> > > in the arch/ppc/boot/simple/relocate.S code and it jumps to the
position
> > > 0x0 after uncompressing, is it right? The kernel is uncompressed
at that
> > > position?
> >
> > Post your output log please.
> >
> > If your getting a message that the kernel is uncompressing, but you
> > don't have any output beyond that then most likely your console is
not
> > setup correctly.  If you've got a debugger, look at memory at the
> > __log_buf location to see if there are any boot logs there.
> >
> > Cheers,
> > g.
> >
> >
> > --
> > Grant Likely, B.Sc., P.Eng.
> > Secret Lab Technologies Ltd.
> >
>=20
>=20
>=20
> --
> Ricardo Ayres Severo <severo.ricardo@gmail•com>
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