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

[Christian Zigotzky]

On 03 May 2023 at 08:15 pm, Rob Herring wrote:
> On Wed, May 3, 2023 at 12:40 PM Christian Zigotzky
> <chzigotzky at xenosoft.de> wrote:
>>
>>
>>> On 3. May 2023, at 18:51, Rob Herring <robh at kernel.org> wrote:
>>>
>>> On Wed, May 3, 2023 at 11:27 AM Christophe Leroy
>>> <christophe.leroy at csgroup.eu> wrote:
>>>> +Rob as he's the commit's Author.
>>>>
>>>>> Le 03/05/2023 à 17:46, Christian Zigotzky a écrit :
>>>>> On 02 May 2023 at 11:28 am, Michael Ellerman wrote:
>>>>>> Christian Zigotzky <chzigotzky at xenosoft.de> writes:
>>>>>>> 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
>>>>>>>
>>>>>>> After a re-compiling, the kernel boots without any problems without the
>>>>>>> PowerPC updates 6.4-1 [2].
>>>>>>>
>>>>>>> Could you please explain me, what you have done in the boot area?
>>>>>> There's a few possibilities, but nothing obvious.
>>>>>>
>>>>>> To begin with can you please test the following commits?
>>>>>>
>>>>>> 77e69ee7ce07
>>>>>> e4ab08be5b49
>>>>>> eeac8ede1755
>>>>>>
>>>>>> cheers
>>>>> git revert e4ab08be5b4902e5b350b0e1e1a3c25eb21d76d4
>>>>>
>>>>> [master 0086e2cbbec0] Revert "powerpc/isa-bridge: Remove open coded
>>>>> "ranges" parsing"
>>>>>   1 file changed, 129 insertions(+), 37 deletions(-)
>>>>>
>>>>> After a recompiling it boots without any problems.
>>>>>
>>>>> e4ab08be5b49 -- powerpc/isa-bridge: Remove open coded "ranges" parsing
>>>>> is the bad commit.
>>> Could I get a DT file for this board?
>>>
>>> In the meantime, just revert this commit. I don't think I'll be able
>>> to fix it before I'm out on sabbatical.
>>>
>>> Rob
>> FYI:
>>
>> Darren Stevens wrote:
>>
>> The dtb passed by the CFE firmware has a number of issues, which up till
>> now have been fixed by use of patches applied to the mainline kernel.
>> This occasionally causes problems with changes made to mainline.
> Changing the firmware is not the only way to modify the DT. Perhaps a
> DT overlay would work better than carrying patches if the patches
> aren't upstreamable. It kind of depends on how early you'd need to
> apply the overlay and whether you'd need external phandles (aka
> __symbols__ node, which the base DTB wouldn't support).
>
> Looking at the DT, I think this change might fix it. Can you test this change:
>
> diff --git a/drivers/of/address.c b/drivers/of/address.c
> index e692809ff822..475b74413fdd 100644
> --- a/drivers/of/address.c
> +++ b/drivers/of/address.c
> @@ -284,7 +284,7 @@ EXPORT_SYMBOL(of_range_to_resource);
>
>   static int of_bus_isa_match(struct device_node *np)
>   {
> -       return of_node_name_eq(np, "isa");
> +       return of_node_is_type(np, "isa") || of_node_name_eq(np, "isa");
>   }
>
>   static void of_bus_isa_count_cells(struct device_node *child,
I tested this patch today but unfortunately the Nemo board doesn't boot.

- Christian