Re: Kernel 6.9 fails to boot with "can't boot dump kernel from OF"

> On 6 Jul 2024, at 17:17, John Paul Adrian Glaubitz <[email protected]> wrote:
> 
> Hi Reimar,
> 
>> On Jul 6, 2024, at 5:09 PM, Reimar Döffinger <[email protected]> wrote:
>> 
>> Hi!
>> The newest 6.9 powerpc kernel build seems to be incompatible with OpenFirmware boot,
>> so boot fails on my PowerPC macMini.
>> The error message is
>> "Error: You can't boot a kdump kernel from OF!"
>> The error message seems not entirely accurate, it seems the issue is that
>> CONFIG_PHYSICAL_START
>> is no longer 0, which probably comes from
>> CONFIG_CRASH_DUMP=y
>> being set.
>> Can this be reverted?
> 
> Could you verify that this change actually fixes the problem? This would save me some work.

I checked the kernel source, the error message is under a if (PHYSICAL_START > 0), so that I am quite certain is the issue.
Actually testing means compiling the kernel, which will take quite some while.

> Also, we need to figure out whether this change was made upstream or in Debian.

The error check etc is not new.
I did also diff the config of the working 6.7 kernel and the non-working 6.9 kernel.
Whether upstream changed the option defaults I do not know, but Debian definitely decides on the config options used in the end.
But it seems most likely that CONFIG_CRASH_DUMP was enabled in Debian.

Best regards,
Reimar