RTEMS Porting Guide
The CPU_PARTITION_ALIGNMENT macro is set to indicate the byte alignment requirement for memory buffers allocated by the RTEMS Partition Manager that is part of the Classic API. This alignment requirement may be stricter than that for the data types alignment specified by CPU_ALIGNMENT. It is common for the partition to follow the same alignment requirement as CPU_ALIGNMENT. If the CPU_ALIGNMENT is strict enough for the partition, then this should be set to CPU_ALIGNMENT. This macro is necessary to ensure that allocated memory is properly aligned for use by high level language routines.
The following example illustrates how the CPU_PARTITION_ALIGNMENT macro is set when the required alignment for elements from the RTEMS Partition Manager is the same as the basic CPU alignment requirements.
#define CPU_PARTITION_ALIGNMENT CPU_ALIGNMENT
NOTE: This does not have to be a power of 2. It does have to be greater or equal to than CPU_ALIGNMENT.
RTEMS Porting Guide
Copyright © 1988-2004 OAR Corporation