Re: [PATCH] powerpc: Allow selection of CONFIG_LD_DEAD_CODE_DATA_ELIMINATION

[Mathieu Malaterre]

On Wed, Apr 18, 2018 at 5:13 PM, Michael Ellerman <mpe@xxxxxxxxxxxxxx> wrote:
> Mathieu Malaterre <malat@xxxxxxxxxx> 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.

Right I see them now.

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

Exactly !

> I assume it doesn't have a serial port.

- 56K Modem line (yes really!)
- 2 USB
- 1 Firewire

:(

> cheers