Issues with the first PowerPC updates for the kernel 6.1

[Michael Ellerman]

Christian Zigotzky <chzigotzky at xenosoft.de> writes:
> No, it’s not fine. We used the POWER4 CPU config before.

We dropped POWER4 support in 2018.

The recent commit just updated the help text to match reality.

There were some changes to the CPU flags, but if anything they should
have made things more likely to work properly on old CPUs.

Previously BIG_ENDIAN && GENERIC_CPU would use -mcpu=power5, now it uses
-mcpu=power4.


cheers

>> On 16. Oct 2022, at 18:51, Segher Boessenkool <segher at kernel.crashing.org> wrote:
>> 
>> On Fri, Oct 14, 2022 at 06:11:21PM +0200, Christian Zigotzky wrote:
>>> make oldconfig has asked because of the CPU family. I choosed GENERIC for my P.A. Semi PWRficient PA6T-1682M. Is this correct? Maybe this is the problem.
>>> 
>>> config GENERIC_CPU
>>> -    bool "Generic (POWER4 and above)"
>>> +    bool "Generic (POWER5 and PowerPC 970 and above)"
>>>    depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
>>>    select PPC_64S_HASH_MMU
>>> 
>>> There isn’t a POWER4 anymore and I used it via CONFIG_GENERIC_CPU=y before.
>> 
>> PA6T is ISA 2.04, just like POWER5+.  It should be fine.
>> 
>> 
>> Segher