[OpenBIOS] [PATCH] ppc: force target CPU

[Programmingkid]

On Jan 25, 2016, at 11:23 AM, Laurent Vivier wrote:

> 
> 
> Le 25/01/2016 16:38, Programmingkid a écrit :
>> 
>> On Jan 25, 2016, at 10:23 AM, Laurent Vivier wrote:
>> 
>>> 
>>> 
>>> Le 25/01/2016 15:48, Programmingkid a écrit :
>>>> 
>>>> On Jan 25, 2016, at 9:31 AM, Laurent Vivier wrote:
>>>> 
>>>>> 
>>>>> 
>>>>> Le 22/01/2016 16:26, Mark Cave-Ayland a écrit :
>>>>>> On 22/01/16 15:05, Andreas Färber wrote:
>>>>>> 
>>>>>>> Am 22.01.2016 um 14:59 schrieb Mark Cave-Ayland:
>>>>>>>> On 20/01/16 08:33, Laurent Vivier wrote:
>>>>>>>>> Le 19/01/2016 21:33, Mark Cave-Ayland a écrit :
>>>>>>>>>> Great! If we go with Segher's suggestion for 64-bit then we end up with
>>>>>>>>>> this:
>>>>>>>>>> 
>>>>>>>>>> 32-bit: -mcpu=604
>>>>>>>>>> 64-bit: -mcpu=970 -mno-altivec
>>>>>>>>> 
>>>>>>>>> I think you can use "-mcpu=power4" here, this is the old default value
>>>>>>>>> for gcc.
>>>>>>>> 
>>>>>>>> It seems they are effectively the same, so I don't have any strong
>>>>>>>> preference either way.
>>>>>>> 
>>>>>>> I prefer Mark's explicit variant, ideally with some explanatory comment.
>>>>>> 
>>>>>> Thanks Andreas! Laurent, can you resubmit accordingly with a brief
>>>>>> comment for each summarising why these flags have been chosen?
>>>>> 
>>>>> I can, but I'm not able to build openbios for target ppc64 on ppc64 host.
>>>>> 
>>>>> Is this normal ?
>>>> 
>>>> It definitely shouldn't be.
>>>> 
>>>>> 
>>>>> $ ./config/scripts/switch-arch ppc64
>>>>> Configuring OpenBIOS on ppc64 for ppc64
>>>>> Initializing build tree /home/laurent/Projects/openbios/obj-ppc64...ok.
>>>>> Creating target config.mak...ok.
>>>>> Creating target rules.mak...ok.
>>>>> Creating config files...ok.
>>>>> [laurent at pmacg5-1 openbios]$ make
>>>>> Building OpenBIOS for ppc64
>>>>> Building...
>>>>> error:
>>>>> HOSTCC host/kernel/dict.o
>>>>> HOSTCC host/kernel/bootstrap.o
>>>>> HOSTCC host/kernel/forth.o
>>>>> HOSTCC host/kernel/stack.o
>>>>> HOSTCC forthstrap
>>>>> GEN   bootstrap.dict
>>>>> panic: segmentation violation at 0x87a1062c
>>>>> dict=0x3fff87a10010 here=0x3fff87a10638(dict+0x628) pc=0x0(dict+0x785efff0)
>>>>> dstackcnt=0 rstackcnt=0 instruction=deadbeef
>>>>> dstack: 0x0
>>>>> rstack: 0x0
>>>>> Writing dictionary core file
>>>>> rules.mak:69: recipe for target 'bootstrap.dict' failed
>>>>> make[1]: *** [bootstrap.dict] Error 1
>>>>> make[1]: Leaving directory '/home/laurent/Projects/openbios/obj-ppc64'
>>>>> Makefile:19: recipe for target 'build' failed
>>>>> make: *** [build] Error 1
>>>> 
>>>> What operating system are you using to build OpenBIOS on? 
>>> 
>>> Fedora23/ppc64
>>> 
>>>> Is your operating system 32 bit or 64 bit?
>>> 
>>> 64bit. but I've tested on debian ppc 32bit and it fails for another reason:
>>> 
>>> CC    target/arch/ppc/qemu/init.o
>>> /home/laurent/Projects/openbios/arch/ppc/qemu/init.c: In function ‘adler32’:
>>> /home/laurent/Projects/openbios/arch/ppc/qemu/init.c:705:17: error: cast
>>> to pointer from integer of different size [-Werror=int-to-pointer-cast]
>>>    char *buf = (char *)POP();
>>>                ^
>>> cc1: all warnings being treated as errors
>>> 
>>>> What version of GCC are you using? 
>>>> 
>>> 
>>> 64bit host: gcc (GCC) 5.1.1 20150618 (Red Hat 5.1.1-4)
>>> 32bit host: gcc (Debian 4.9.2-10) 4.9.2
>>> 
>>> Laurent
>> 
>> I use to have segmentation violations when I would compile OpenBIOS. The fix
>> for me was to do this: 
>> 
>> HOSTARCH=amd64 ./switch-arch ppc
>> 
>> But you should try this:
>> 
>> HOSTARCH=ppc64 ./switch-arch ppc
> 
> The problem is not with "switch-arch ppc" but with "switch-arch ppc64"
> 
> and the result is the same.

It was worth a try. So you are saying the 'ppc' option does successfully 'make' on your
PowerPC G5 system?

The forthstrap command is what is producing the error message. I assume it is 64 bit, but that assumption could be wrong. Could you report the output of this command: file ./config/scripts/obj-ppc/forthstrap

>> 
>> Lets see what happens when you try it.
>> 
>> Also what is the output of your "uname -a" command on the 64 bit operating system?
> 
> Linux pmacg5-1 4.4.0+ #10 SMP Mon Jan 11 15:30:32 CET 2016 ppc64 ppc64
> ppc64 GNU/Linux
> 
> Laurent


The good news is that your uname command is reporting the correct values.