"node 0".  The "host node" may or may not be the "master node".  Notealso that the "host node" need not necessarily be a VxWorks node.Below are the crucial "config.h" parameters involved in shared memory:.IP "SM_OFF_BOARD (TRUE or FALSE):"The parameter has a configurable value of either TRUE or FALSEand directly determines the value of SM_ANCHOR_ADRS (the anchoraddress).  If SM_OFF_BOARD is defined as FALSE, then the anchor is on-boardand SM_ANCHOR_ADRS is defined to beLOCAL_MEM_LOCAL_ADRS + SM_ANCHOR_OFFSET.LOCAL_MEM_LOCAL_ADRS is defined as 0x0 in "config.h" andSM_ANCHOR_OFFSET is defined as 0x4100 in "config.h".  If defined as TRUE, then SM_ANCHOR_ADRS is defined as a functioncall: sysSmAnchorAdrs() (defined in "sysLib.c").  This functionwill dynamically poll, at system startup, various locations(explained below) for the exact location of the shared memoryanchor.  Note that if "sm=xxxxxxxx" is used as a boot parameter, thenSM_OFF_BOARD has no effect.  The value of "xxxxxxxx" will be usedas the anchor location regardless of the setting of SM_OFF_BOARD.If simply "sm" is used as a boot parameter, then SM_OFF_BOARD isqueried at initialization time to determine if polling is requiredor not..IP "SYS_SM_SYSTEM_MEM_POLL (#define or #undef):"This define only has an effect if anchor polling is called for(because SM_OFF_BOARD is defined as TRUE and "sm" is used with no"=xxxxxxxx").  In this case, simply defining SYS_SM_SYSTEM_MEM_POLLwill cause the node to poll for the anchor at compact PCI busaddress PCI2DRAM_BASE_ADRS + SM_ANCHOR_OFFSET (0x80004100)."System memory" (which is the host node's DRAM) willbe included as one of the locations where the anchor might reside.Note that other locations my be polled as well (explained later).Not defining SYS_SM_SYSTEM_MEM_POLL will prevent the polling ofsystem  memory for the anchor..IP "SYS_SM_ANCHOR_POLL_LIST (#define or #undef):"This define has an effect only if polling is called for (seeSM_OFF_BOARD explained above).  When defined,SYS_SM_ANCHOR_POLL_LIST allows a list of devices, identified bydevice/vendor ID and subsystem ID/subsystem vendor ID to bespecified as candidates for the anchor location.  Devices whichappear directly on the compact PCI bus are found and if theyappear on the list defined by SYS_SM_ANCHOR_POLL_LIST, they arechecked to see if they house the shared memory anchor.  The memorydefined by the first memory BAR is queried at offsetSM_ANCHOR_OFFSET (0x4100 by default, defined in "configAll.h").  IfSYS_SM_ANCHOR_POLL_LIST is not defined, ALL devices on the compactPCI bus will be considered candidates for the anchor location andwill be polled.  If SYS_SM_ANCHOR_POLL_LIST defined but empty, NOdevices on the compact PCI bus will be considered candidates forthe anchor location.  In that case, the only location polled wouldbe system memory if SYS_SM_SYSTEM_MEM_POLL (see above) was defined..IP "SYS_SM_DEVICE_LIST"This define lists the Dec2155x-based cPCI boards which support shared memory byPCI Subsystem Vendor ID and Subsystem ID. To recognize a new Dec2155x-basedcPCI board as a participant in the shared memory subsystem, simply add a newentry to this list..IP "INCLUDE_SM_SEQ_ADDR (#define or #undef)"If "undef'ed", sequential addressing is disabled.  This symbolis defined by default..LPConsider a system consisting of an MCP750 (host node) and two MCPN750s.The following six configurations are the only ones possible:.TS Eexpand;lf3 lf3 lf3 lf3l l l l ..ne 8.sp .5	Master node on...	Anchor on...	Sequential Addressing?_1.	MCP750	MCP750	NO2.	MCP750	MCP750	YES3.	MCPN750	MCP750	NO4.	MCPN750	MCP750	YES5.	MCPN750	MCPN750	NO6.	MCPN750	MCPN750	YES.TEBelow is a description of how each of the above systems would beconfigured.  Crucial "config.h" and boot parameter settings for anexample system are given.  In each example, SYS_SM_ANCHOR_POLL_LISTwas defined to contain information identifying the Dec21554 bridgechip (present on the MCPN750).  See "config.h" for the example ofhow this was done..ne 6.IP "1)"MCP750 master, MCP750 anchor, no sequential addressing:.CS   MCP750:        #define SM_OFF_BOARD FALSE        #undef  SYS_SM_SYSTEM_MEM_POLL        #undef  INCLUDE_SM_SEQ_ADDR        boot device          : dc        host name            : sunray        processor number     : 0        inet on ethernet (e) : 124.170.16.112        inet on backplane (b): 124.200.200.1:ffffff00        host inet (h)        : 124.170.16.143        gateway inet (g)     : 124.170.16.233        target name (tn)     : gamma   MCPN750-1:        #define SM_OFF_BOARD TRUE        #define SYS_SM_SYSTEM_MEM_POLL        #undef  INCLUDE_SM_SEQ_ADDR        boot device          : sm        host name            : sunray        processor number     : 1        inet on ethernet (e) : 124.170.16.109        inet on backplane (b): 124.200.200.2        host inet (h)        : 124.170.16.143        gateway inet (g)     : 124.200.200.1        target name (tn)     : alpha   MCPN750-2:        (same "config.h" setup as MCPN750-1 above)        boot device          : sm        host name            : sunray        processor number     : 2        inet on ethernet (e) : 124.170.16.110        inet on backplane (b): 124.200.200.3        host inet (h)        : 124.170.16.143        gateway inet (g)     : 124.200.200.1        target name (tn)     : beta.CE.ne 6.IP "2)"MCP750 master, MCP750 anchor, sequential addressing:.CS   MCP750:        #define SM_OFF_BOARD FALSE        #define SYS_SM_CPCI_BUS_NUMBER    1        #undef SYS_SM_SYSTEM_MEM_POLL        /* #undef INCLUDE_SM_SEQ_ADDR */        boot device          : dc        host name            : sunray        processor number     : 0        inet on ethernet (e) : 124.170.16.112:ffffff00        inet on backplane (b): 124.200.200.1:ffffff00        host inet (h)        : 124.170.16.143        gateway inet (g)     : 124.170.16.233        target name (tn)     : gamma   MCPN750-1:         #define SM_OFF_BOARD TRUE        #define SYS_SM_CPCI_BUS_NUMBER    1        #define SYS_SM_SYSTEM_MEM_POLL        /* #undef INCLUDE_SM_SEQ_ADDR */        boot device          : sm        host name            : sunray        processor number     : 1        inet on ethernet (e) :        inet on backplane (b):        host inet (h)        : 124.170.16.143        gateway inet (g)     :        target name (tn)     : alpha   MCPN750-2:        (same "config.h" setup as MCPN750-1 above)        boot device          : sm        host name            : sunray        processor number     : 2        inet on ethernet (e) :        inet on backplane (b):        host inet (h)        : 124.170.16.143        gateway inet (g)     :        target name (tn)     : beta.CE.ne 6.IP "3)"MCPN750 master, MCP750 anchor, no sequential addressing:.CS   MCP750:        #define SM_OFF_BOARD TRUE        #undef  SYS_SM_SYSTEM_MEM_POLL        #undef  INCLUDE_SM_SEQ_ADDR        boot device          : sm        host name            : sunray        processor number     : 1        inet on ethernet (e) : 124.170.16.112        inet on backplane (b): 124.200.200.1        host inet (h)        : 124.170.16.143        gateway inet (g)     : 124.200.200.2        target name (tn)     : gamma   MCPN750-1:        #define SM_OFF_BOARD FALSE        #define SYS_SM_SYSTEM_MEM_POLL        #undef  INCLUDE_SM_SEQ_ADDR        boot device          : dc        processor number     : 0        host name            : sunray        inet on ethernet (e) : 124.170.16.109        inet on backplane (b): 124.200.200.2:ffffff00        host inet (h)        : 124.170.16.143        gateway inet (g)     : 124.170.16.233        target name (tn)     : alpha   MCPN750-2:        #define SM_OFF_BOARD TRUE        #define SYS_SM_SYSTEM_MEM_POLL        #undef  INCLUDE_SM_SEQ_ADDR        boot device          : sm        processor number     : 2        host name            : sunray        inet on ethernet (e) : 124.170.16.110        inet on backplane (b): 124.200.200.3        host inet (h)        : 124.170.16.143        gateway inet (g)     : 124.200.200.2        target name (tn)     : beta.CE.ne 6.IP "4)"MCPN750 master, MCP750 anchor, sequential addressing:.CS   MCP750:        #define SM_OFF_BOARD TRUE        #undef  SYS_SM_SYSTEM_MEM_POLL        /* #undef  INCLUDE_SM_SEQ_ADDR */        boot device          : sm        processor number     : 1        host name            : sunray        inet on ethernet (e) :        inet on backplane (b):        host inet (h)        : 124.170.16.143        gateway inet (g)     :        target name (tn)     : gamma   MCPN750-1:        #define SM_OFF_BOARD FALSE        #define SYS_SM_CPCI_BUS_NUMBER    1        #define SYS_SM_SYSTEM_MEM_POLL        /* #undef  INCLUDE_SM_SEQ_ADDR */        boot device          : dc        processor number     : 0        host name            : sunray        inet on ethernet (e) : 124.170.16.109:ffffff00        inet on backplane (b): 124.200.200.1:ffffff00        host inet (h)        : 124.170.16.143        gateway inet (g)     : 124.170.16.233        target name (tn)     : alpha   MCPN750-2:        #define SM_OFF_BOARD TRUE        #define SYS_SM_CPCI_BUS_NUMBER    1        #define SYS_SM_SYSTEM_MEM_POLL        /* #undef  INCLUDE_SM_SEQ_ADDR */        boot device          : sm        processor number     : 2        host name            : sunray        inet on ethernet (e) :        inet on backplane (b):        host inet (h)        : 124.170.16.143        gateway inet (g)     :        target name (tn)     : beta.CE.ne 6.IP "5)"MCPN750 master, MCPN750 anchor, no sequential addressing:.CS   MCP750:        #define SM_OFF_BOARD TRUE        #undef  SYS_SM_SYSTEM_MEM_POLL        #undef  INCLUDE_SM_SEQ_ADDR        boot device          : sm        processor number     : 1        host name            : sunray        inet on ethernet (e) : 124.170.16.112        inet on backplane (b): 124.200.200.1        host inet (h)        : 124.170.16.143        gateway inet (g)     : 124.200.200.2        user (u)             : ball        ftp password (pw) (blank = use rsh):        flags (f)            : 0x0        target name (tn)     : gamma   MCPN750-1:        #define SM_OFF_BOARD FALSE        #undef  SYS_SM_SYSTEM_MEM_POLL        #undef  INCLUDE_SM_SEQ_ADDR