Support for Freescale QorIQ T2080 and T4240

[Joel Sherrill]

On December 16, 2014 3:30:01 AM CST, Sebastian Huber <sebastian.huber at embedded-brains.de> wrote:
>
>On 16/12/14 01:50, Joel Sherrill wrote:
>> On 12/15/2014 6:22 AM, Sebastian Huber wrote:
>>> Hello,
>>>
>>> we work currently on a BSP for the Freescale QorIQ T2080 and T4240
>>> chips.  The T4240 is a 12 core PowerPC supporting 24 virtual cores
>(two
>>> virtual cores share a FPU and AltiVec unit).  These chips use the
>e6500
>>> core which supports the 64-bit PowerPC instruction set. We will only
>use
>>> the 32-bit mode.
>>>
>> The sharing of the FPU and Altivec is similar to the AMD Bulldozer.
>Is
>> this something
>> that RTEMS has to care about?
>>
>
>No, this is a problem for the application designer.

Same as the Bulldozer. If you want top FP performance, you will have to account for this I expect and distribute threads to minimize impact of the shared resource

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