Description: Starfire supports Shared Memory Domains. This requires the memory boards in the machine to have unique address. Because of this global requirement, Starfire hpost assigns the memory addresses, as well as for attaching boards. DR detach operation also assigns memory addresses. The method used to ensure unique addresses is to assign addresses based on slot number. To allow for 2 way inter-board interleaving, these addresses are slot number*8G.

The map is a 16-byte array representing the 16 slots. The lower 7 bits of each byte represents the unique address assign to that slot. The high bit is significant on a write-operation only, when set the corresponding slot of the map will be changed with the address represented by the lower 7 bits. On a read operation the returning data represents the current memory map and the high bit of each byte is always 0. On a write operation the byte with the high bit set will be modified.

The SNMP agent will perform a consistency check before committing a write operation. Consistency check simply makes sure no two slots will contain the same address if the write is performed. If consistency check fails, the write operation will return an error.