[Bisected] PowerMac G5 fails booting kernel 6.6-rc3 (BUG: Unable to handle kernel data access at 0xfeffbb62ffec65fe)

[Michael Ellerman]

Erhard Furtner <erhard_f at mailbox.org> writes:
> Greetings!
>
> Kernel 6.5.5 boots fine on my PowerMac G5 11,2 but kernel 6.6-rc3
> fails to boot with following dmesg shown on the OpenFirmware console
> (transcribed screenshot):

Thanks for transcribing all that :)

I don't see this crash on my quad G5.

I notice that your config has CONFIG_FLATMEM=y. Can you try switching to
SPARSEMEM and see if that helps? It might help us narrow down the bug at
least.

cheers