[Buildroot] how to tune powerpc e500v2 cpus in BR

[raymond zhao]

buildroot: gcc 4.6.x,
in .config:
CT_CC="gcc"
CT_CC_VERSION="4.6.0"
CT_CC_gcc=y
CT_CC_GCC_SHOW_LINARO=y
# CT_CC_V_linaro_4_6_2011_04_0 is not set

My development machine is ubuntu 10.04, with gcc 4.4.3

thanks
raymond

On Fri, Jun 24, 2011 at 5:44 PM, Bryan Hundven <bryanhundven at gmail.com> wrote:
> On Fri, Jun 24, 2011 at 2:41 PM, raymond zhao <raymond.zhao.ml at gmail.com> wrote:
>> The error caused by the option "-mabi=spe"
>> The cross compiler report: cc1: error: not configured for ABI: 'spe'.
>> So, there must be some option need to be past when we compile the GCC.
>> Anyone has any idea?
>
> What version of gcc are you using?
>
>> thanks,
>>
>> Raymond
>>
>> On Fri, Jun 24, 2011 at 5:14 PM, raymond zhao <raymond.zhao.ml at gmail.com> wrote:
>>>
>>> Thanks, Matias
>>> After looked into the scripts. I believe you are right. But somehow I have
>>> problem with building target gdb server when I put this flags there. I am
>>> keep digging now.
>>>
>>> thanks
>>>
>>> raymond
>>> On Fri, Jun 24, 2011 at 1:31 PM, Matias Garcia <mgarcia at rossvideo.com>
>>> wrote:
>>>>
>>>> Hi Raymond,
>>>>
>>>> You can put those in the BR2_TARGET_OPTIMIZATIONS setting under the
>>>> Toolchain page e.g.
>>>>
>>>> (-mcpu=8548 -mspe=yes -mabi=spe -mhard-float -mfloat-gprs=double)  Target
>>>> Optimizations
>>>>
>>>> I selected a generic powerpc target because I didn't need the -mtune when
>>>> I was specifying -mcpu already. As far as I know, 8548 and 8540 work out to
>>>> the same code.
>>>>
>>>> I switched to the external CodeSourcery build tools for two reasons: (1)
>>>> it allowed us to compile our application with -O3 (which we need) while the
>>>> standard GNU toolchain caused some errors, and (2) they're supported by the
>>>> Freescale/Mentor/CodeSourcery relationship, and not all of the patches get
>>>> applied to mainline (particularly for newer processors). I had to add an
>>>> option to the external wrapper so that it would call the toolchain with
>>>> '-te500v2' which is a shortcut for the optimizations you list below. In that
>>>> case, you can build your own applications without calling any options
>>>> explicitly.
>>>>
>>>> Cheers,
>>>> Matias
>>>>
>>>> On 11-06-24 10:27 AM, raymond zhao wrote:
>>>>>
>>>>> Hi,
>>>>> I am using freescale's p1020 CPU. It is a e500v2 core. How could I
>>>>> config the build root to tune the tool chain for the following
>>>>> options:
>>>>>
>>>>> -mcpu=8548 -mspe=yes -mabi=spe -mhard-float -mfloat-gprs=double
>>>>>
>>>>>  From the menuconfig, I can only select CPU as 8540.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Raymond
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>>>
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