99bdf978d7
* [rtdef] rename RT_WEAK attribute as rt_weak * [rtdef] rename RT_USED attribute as rt_used * [rtdef] rename RT_SECTION attribute as rt_section * [rtdef] rename ALIGN attribute as rt_align * [legacy] add RT_USED ALIGN RT_SECTION RT_WEAK as legacy support
1. M4 run on flash bank A. M0 run on flash bank B and the binary code of M0 is embedded into the code of M4. 3. Compile the project in M0/ first and then compile the project in M4/. Then flash it into the chip with JLink.