lkml.org 
[lkml]   [2022]   [Nov]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH v3] powerpc/boot: Don't always pass -mcpu=powerpc when building 32-bit uImage
Date


Le 01/11/2022 à 23:12, Pali Rohár a écrit :
> On Sunday 09 October 2022 13:06:52 Pali Rohár wrote:
>> On Monday 29 August 2022 10:54:51 Pali Rohár wrote:
>>> On Sunday 28 August 2022 17:43:53 Christophe Leroy wrote:
>>>> Le 28/08/2022 à 19:41, Pali Rohár a écrit :
>>>>> On Sunday 28 August 2022 17:39:25 Christophe Leroy wrote:
>>>>>> Le 28/08/2022 à 19:33, Christophe Leroy a écrit :
>>>>>>>
>>>>>>>
>>>>>>> Le 28/08/2022 à 11:56, Pali Rohár a écrit :
>>>>>>>> When CONFIG_TARGET_CPU is specified then pass its value to the compiler
>>>>>>>> -mcpu option. This fixes following build error when building kernel with
>>>>>>>> powerpc e500 SPE capable cross compilers:
>>>>>>>>
>>>>>>>>      BOOTAS  arch/powerpc/boot/crt0.o
>>>>>>>>    powerpc-linux-gnuspe-gcc: error: unrecognized argument in option
>>>>>>>> ‘-mcpu=powerpc’
>>>>>>>>    powerpc-linux-gnuspe-gcc: note: valid arguments to ‘-mcpu=’ are:
>>>>>>>> 8540 8548 native
>>>>>>>>    make[1]: *** [arch/powerpc/boot/Makefile:231:
>>>>>>>> arch/powerpc/boot/crt0.o] Error 1
>>>>>>>
>>>>>>> corenet64_smp_defconfig :
>>>>>>>
>>>>>>>   BOOTAS  arch/powerpc/boot/crt0.o
>>>>>>> powerpc64-linux-gcc: error: missing argument to '-mcpu='
>>>>>>> make[1]: *** [arch/powerpc/boot/Makefile:237 : arch/powerpc/boot/crt0.o]
>>>>>>> Erreur 1
>>>>>>> make: *** [arch/powerpc/Makefile:253 : uImage] Erreur 2
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> Seems like in fact, E5500_CPU and E6500_CPU are not taken into account
>>>>>> in CONFIG_TARGET_CPU, and get special treatment directly in
>>>>>> arch/powerpc/Makefile.
>>>>>>
>>>>>> This goes unnoticed because of CFLAGS-$(CONFIG_TARGET_CPU_BOOL) +=
>>>>>> $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
>>>>>>
>>>>>> I think we need to fix that prior to your patch.
>>>>>
>>>>> It looks like that CONFIG_TARGET_CPU is broken.
>>>>>
>>>>> $ make ARCH=powerpc corenet64_smp_defconfig CROSS_COMPILE=powerpc64-linux-gnu-
>>>>> ...
>>>>> # configuration written to .config
>>>>>
>>>>> $ grep CONFIG_TARGET_CPU .config
>>>>> CONFIG_TARGET_CPU_BOOL=y
>>>>>
>>>>> CONFIG_TARGET_CPU_BOOL is set but CONFIG_TARGET_CPU not!
>>>>
>>>> Yes, because there is no default value for E5500_CPU and E6500_CPU. We
>>>> need to add one for each.
>>>
>>> I see... Will you prepare this fixup for your previous patch?
>>>
>>> And I think that following construct
>>>
>>> $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
>>>
>>> should be changed just to
>>>
>>> -mcpu=$(CONFIG_TARGET_CPU)
>>>
>>> Because if user specified that want build for specific target CPU, it
>>> should not be silently ignored.
>>
>> Christophe, should I do something in this area?
>
> Christophe, any input from your side?

Hi, sorry I was on holiday until today. I'll try to have a look in the
coming days.
\
 
 \ /
  Last update: 2022-11-02 15:07    [W:0.172 / U:0.096 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site