11026d0579
SCons will omit the file in parent dir of SConstruct somehow and build the object files in that dir instead of in variant dir. This cause problem because we cannot mix the object files between M0 and M4 which SCons failed to rebuild. So we have to manually remove the files before building.
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.