[OpenBIOS] [PATCH] ppc: force target CPU

[Laurent Vivier]

Le 19/01/2016 21:33, Mark Cave-Ayland a écrit :
> On 19/01/16 18:34, Hervé Poussineau wrote:
> 
>> Le 19/01/2016 19:05, Andreas Färber a écrit :
>>> Am 19.01.2016 um 18:42 schrieb Segher Boessenkool:
>>>> On Tue, Jan 19, 2016 at 01:50:13AM +0100, Laurent Vivier wrote:
>>>>> According to this series (from Hervé):
>>>>>
>>>>>      https://lists.gnu.org/archive/html/qemu-ppc/2015-06/msg00110.html
>>>>>
>>>>> RS/6000 7020/40p is a PReP machine.
>>>>>
>>>>> And according to this page:
>>>>>
>>>>>     https://en.wikipedia.org/wiki/RS/6000#Type_7020
>>>>>
>>>>> RS/6000 7020/40p is PowerPC 601 based.
>>>>
>>>> 601 doesn't have much to do with 602.  601 is not fully PowerPC; you do
>>>> not want to deal with it.
>>>
>>> I believe Hervé was using a real firmware from IBM FTP for that one, not
>>> OpenBIOS.
>>>
>>> Andreas
>>>
>>
>> Yes, I was using the real IBM firmware for my tests.
>> As IBM 7020 was upgradable to 604, real firmware works with 601 and 604
>> types.
>> Let's say that QEMU emulates an upgraded 7020, by using a 604 cpu by
>> default.
>> As a consequence, I see no problem compiling OpenBIOS for a 604 CPU.
> 
> 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.

> 
> Andreas, does this look reasonable to you?
> 
> 
> ATB,
> 
> Mark.
>