Subject: [Suggestion] ARM:S5pv210: compiling issue for s5pv210 by using randconfig

From: [email-masked] (Chen Gang)
Date: Fri, 19 Apr 2013 19:56:56 +0800

On 2013?04?17? 19:02, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 12:53 Wed 17 Apr     , Arnd Bergmann wrote:
>> On Wednesday 17 April 2013, Will Deacon wrote:
>>>> arm-linux-gnu-gcc -Wp,-MD,arch/arm/vfp/.vfphw.o.d  -nostdinc -isystem /usr/lib/gcc/arm-linux-gnueabi/4.7.1/include -I/root/linux-next/arch/arm/include -Iarch/arm/include/generated  -Iinclude -I/root/linux-next/arch/arm/include/uapi -Iarch/arm/include/generated/uapi -I/root/linux-next/include/uapi -Iinclude/generated/uapi -include /root/linux-next/include/linux/kconfig.h -D__KERNEL__ -mlittle-endian -Iarch/arm/mach-s5pv210/include -Iarch/arm/plat-samsung/include  -D__ASSEMBLY__ -mabi=apcs-gnu -mno-thumb-interwork -marm -D__LINUX_ARM_ARCH__=4 -march=armv4t -mtune=arm9tdmi -include asm/unified.h -Wa,-mfpu=softvfp+vfp -mfloat-abi=soft        -c -o arch/arm/vfp/vfphw.o arch/arm/vfp/vfphw.S
>>>>
>>>>
>>>>   compiling err:
>>>>
>>>> arch/arm/vfp/vfphw.S: Assembler messages:
>>>> arch/arm/vfp/vfphw.S:295: Error: selected processor does not support ARM mode `mrrc p11,3,r0,r1,c0'
>>>> arch/arm/vfp/vfphw.S:295: Error: selected processor does not support ARM mode `mrrc p11,3,r0,r1,c1'
>>>
>>> The problem here is that you've ended up targetting a platform (s5pv210)
>>> that selects CPU_V7. VFP is then subsequently selected, but CONFIG_MMU=n, so
>>> 7TDMI and 9TDMI (v4 CPUs, no VFP) are selectable. Selecting either of those,
>>> causes these warnings.
>>>
>>> Unfortunately, I'm not sure how best to fix this. Most of the !MMU CPUs are
>>> tied to a particular board (lots of `if ARCH_INTEGRATOR' predicates), but we
>>> don't want to do that for 7tdmi.
>>>
>>> If we could enforce the strict exclusion of {<= ARMv5} and {ARMv6+} in the
>>> Kconfig, that would solve your problem.
>>
>> I have not tried to get no-MMU kernels to build in general. I think the way
>> it should be done is to not offer any user-selectable CPU types at all but
>> always select the CPU from the board.
>>
>> For randconfig tests, I would recommend turning on CONFIG_MMU unconditionally
>> using an appropriate KCONFIG_ALLCONFIG= file.
>>
>> The alternative is to use the patch below, but it may be incomplete: I could
>> not find anything other than AT91x40 in the kernel that actually has an
>> ARM7TDMI or ARM9TDMI.
>>
>> 	Arnd
>>
>> diff --git a/arch/arm/mach-at91/Kconfig.non_dt b/arch/arm/mach-at91/Kconfig.non_dt
>> index 6c24985..dc972e1 100644
>> --- a/arch/arm/mach-at91/Kconfig.non_dt
>> +++ b/arch/arm/mach-at91/Kconfig.non_dt
>> @@ -47,6 +47,7 @@ config ARCH_AT91X40
>>  	select ARCH_USES_GETTIMEOFFSET
>>  	select MULTI_IRQ_HANDLER
>>  	select SPARSE_IRQ
>> +	select CPU_ARM7TDMI
>>  
>>  endchoice
>>  
>> diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
>> index 84af266..c5e4ef0 100644
>> --- a/arch/arm/mm/Kconfig
>> +++ b/arch/arm/mm/Kconfig
>> @@ -6,7 +6,6 @@ comment "Processor Type"
>>  
>>  # ARM7TDMI
>>  config CPU_ARM7TDMI
>> -	bool "Support ARM7TDMI processor"
> whith the bool type at least
>>  	depends on !MMU
>>  	select CPU_32v4T
>>  	select CPU_ABRT_LV4T
>> @@ -56,7 +55,6 @@ config CPU_ARM740T
>>  
>>  # ARM9TDMI
>>  config CPU_ARM9TDMI
>> -	bool "Support ARM9TDMI processor"
>>  	depends on !MMU
>>  	select CPU_32v4T
>>  	select CPU_ABRT_NOMMU
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 
> 

  thank you for your all valuable information.

  if no one have time to continue to try, I should try (glad to try)

  if I try, I think I should:
    a. make a related patch according to all of you said.
    b. make menuconfig with the original .config
         save directly, and exit the menuconfig.
    c. check the related CONFIG_* value in new .config
    d. build
    e. ...
    z. I should fix this issue within this month.

  welcome any suggestions or completions.

  thanks.

-- 
Chen Gang

Asianux Corporation