[PASEMI NEMO] Boot issue with the PowerPC updates 6.4-1

[Linux regression tracking (Thorsten Leemhuis)]

On 08.05.23 14:58, Bagas Sanjaya wrote:
> On Mon, May 08, 2023 at 01:29:22PM +0200, Linux regression tracking #adding (Thorsten Leemhuis) wrote:
>> [CCing the regression list, as it should be in the loop for regressions:
>> https://docs.kernel.org/admin-guide/reporting-regressions.html]
>>
>> [TLDR: I'm adding this report to the list of tracked Linux kernel
>> regressions; the text you find below is based on a few templates
>> paragraphs you might have encountered already in similar form.
>> See link in footer if these mails annoy you.]
>>
>> On 02.05.23 04:22, Christian Zigotzky wrote:
>>> Hello,
>>>
>>> Our PASEMI Nemo board [1] doesn't boot with the PowerPC updates 6.4-1 [2].
>>>
>>> The kernel hangs right after the booting Linux via __start() @
>>> 0x0000000000000000 ...
>>>
>>> I was able to revert the PowerPC updates 6.4-1 [2] with the following
>>> command: git revert 70cc1b5307e8ee3076fdf2ecbeb89eb973aa0ff7 -m 1
>>>
>> <snipped> ... 
>> Thanks for the report. To be sure the issue doesn't fall through the
>> cracks unnoticed, I'm adding it to regzbot, the Linux kernel regression
>> tracking bot:
>>
>> #regzbot ^introduced e4ab08be5b4902e5
> 
> Why and how can you conclude that the culprit is e4ab08be5b4902 ("powerpc/isa-bridge:
> Remove open coded "ranges" parsing") rather than powerpc PR merge commit
> 70cc1b5307e8ee ("Merge tag 'powerpc-6.4-1' of
> git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux")? 

I looked at the thread and noticed it was mentioned later (
https://lore.kernel.org/all/3fa42c8c-09bd-d0f0-401b-315b484f4bb0@xenosoft.de/
).

Ciao, Thorsten