FreeRTOS移植到M7内核注意内核版本问题，r0p1版有bug，以上版本没问题

eric2013

原文：
There are two options for running FreeRTOS on ARM Cortex-M7 microcontrollers.
The best option depends on the revision of the ARM Cortex-M7 core in use.  The
revision is specified by an 'r' number, and a 'p' number, so will look something
like 'r0p1'.  Check the documentation for the microcontroller in use to find the
revision of the Cortex-M7 core used in that microcontroller.  If in doubt, use
the FreeRTOS port provided specifically for r0p1 revisions, as that can be used
with all core revisions.

The first option is to use the ARM Cortex-M4F port, and the second option is to
use the Cortex-M7 r0p1 port - the latter containing a minor errata workaround.

If the revision of the ARM Cortex-M7 core is not r0p1 then either option can be
used, but it is recommended to use the FreeRTOS ARM Cortex-M4F port located in
the /FreeRTOS/Source/portable/RVDS/ARM_CM4F directory.

If the revision of the ARM Cortex-M7 core is r0p1 then use the FreeRTOS ARM
Cortex-M7 r0p1 port located in the /FreeRTOS/Source/portable/RVDS/ARM_CM7/r0p1
directory.


意思是说对于r0p1版本的bug，有一个专门的移植文件（有一个微小的修正），当然，这个文件可以用于所有M7内核，含已经解决此bug的高版本内核。

对于高版本M7内核，推荐使用M4F里面的移植文件，