linux-kernel - Re: [PATCH] powerpc: Allow selection of CONFIG_LD_DEAD_CODE_DATA

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Date:   Thu, 19 Apr 2018 01:13:18 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Mathieu Malaterre <malat@...ian.org>,
        Christophe LEROY <christophe.leroy@....fr>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc: Allow selection of CONFIG_LD_DEAD_CODE_DATA_ELIMINATION

Mathieu Malaterre <malat@...ian.org> writes:
> On Wed, Apr 18, 2018 at 8:34 AM, Christophe LEROY
...
>
>> Can you also provide a copy of the messages you can see (prom_init ...) when
>> boot is ok ?
>
> Hum. I've always been interested in seeing it also myself. Is there a
> way to setup env to see those message (netconsole, delayed boot
> messages ...) ? I never found a clear documentation on how to do that
> on (closed) Apple hardware.

If you see nothing after prom_init it usually indicates the kernel died
very early in boot before it could find the console.

The only option then is to enable one of the hard-coded EARLY_DEBUG
options.

I don't know which one works on a G4, maybe CONFIG_PPC_EARLY_DEBUG_BOOTX ?

I assume it doesn't have a serial port.

cheers