RTEMS Porting Guide
The CPU_ALIGNMENT macro should be set to the CPU's worst alignment requirement for data types on a byte boundary. This is typically the alignment requirement for a C double. This alignment does not take into account the requirements for the stack.
The following sets the CPU_ALIGNMENT macro to 8 which indicates that there is a basic C data type for this port which much be aligned to an 8 byte boundary.
#define CPU_ALIGNMENT 8
RTEMS Porting Guide
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