RTEMS CPU Architecture Supplement
The MC68xxx family supports a flat 32-bit address space with addresses ranging from 0x00000000 to 0xFFFFFFFF (4 gigabytes). Each address is represented by a 32-bit value and is byte addressable. The address may be used to reference a single byte, word (2-bytes), or long word (4 bytes). Memory accesses within this address space are performed in big endian fashion by the processors in this family.
Some of the MC68xxx family members such as the MC68020, MC68030, and MC68040 support virtual memory and segmentation. The MC68020 requires external hardware support such as the MC68851 Paged Memory Management Unit coprocessor which is typically used to perform address translations for these systems. RTEMS does not support virtual memory or segmentation on any of the MC68xxx family members.
RTEMS CPU Architecture Supplement
Copyright © 1988-2007OAR Corporation