gtl_config_pos_triple_slave.c shows the GTL configuration for 3 Slave mode devices controled over POS.

/*============================================================================
 *      COPYRIGHT(c) 2008 Mindspeed Technologies.
 *  File Purpose : GTL CSME configuration for a Master mode device
 *  Module       : GTL
============================================================================*/
/*this configuration described a 3 MSP slave setup.
The Host controls the MSPs from POS interface */

#include "gtl_config.h"

/* default values used in default_device_configuration */
#define POS_PHYID(id)   (id)
#define POS_MAC(phyid)                  {0x00,0x00,0x00,0x00,phyid,0x00}
#define HOST_MAC                        {0x00,0x11,0x11,0xEF,0x68,0x7B}
#define POS_IF_NAME                     "pos0"
#define MAX_STRING_INTERFACE_NAME       20

/* Structure to define the default values for the device configuration  */
static SPOSUsrData gtl_device_configuration_1 = {
        NULL,                   /* pointer to next device */
        ePOS_ITF,               /* control interface type to use */
        0,                      /* device ID */
        0,                      /* Version information (not used) */
        eSLAVE,                 /* Slave / Master mode */
        DEV_TYPE_M827XX,        /* Other Slave Device type DEV_TYPE_M823XX, DEV_TYPE_M825XX, DEV_TYPE_M826XX, DEV_TYPE_M829XX */
        True,                   /* Default or custom max channels */
        0,                      /* Max Channels if above flag is custom */
        (POS_PHYID(0)),         /* Physical Identifier */
        ePOSoTSP3,              /* Physical Path Type */
        POS_MAC(POS_PHYID(0)),  /* Device MAC Address */
        HOST_MAC,               /* Host MAC Address (used in MAAS ASSIGN only for CSME Slave) */
        (char *)POS_IF_NAME,    /* Interface name on which communication with device is taking place eg pos0 */
        1,                      /* 1 : ACK is required */
        {{0}},                  /* Path info*/
        0                       /* Ethernet unit*/
};

/* Structure to define the default values for the device configuration  */
static SPOSUsrData gtl_device_configuration_2 = {
        NULL,                   /* pointer to next device */
        ePOS_ITF,               /* control interface type to use */
        1,                      /* device ID */
        0,                      /* Version information (not used) */
        eSLAVE,                 /* Slave / Master mode */
        DEV_TYPE_M827XX,        /* Other Slave Device type DEV_TYPE_M823XX, DEV_TYPE_M825XX, DEV_TYPE_M826XX, DEV_TYPE_M829XX */
        True,                   /* Default or custom max channels */
        0,                      /* Max Channels if above flag is custom */
        (POS_PHYID(1)),         /* Physical Identifier */
        ePOSoTSP3,              /* Physical Path Type */
        POS_MAC(POS_PHYID(1)),  /* Device MAC Address */
        HOST_MAC,               /* Host MAC Address (used in MAAS ASSIGN only for CSME Slave) */
        (char *)POS_IF_NAME,    /* Interface name on which communication with device is taking place eg pos0 */
        1,                      /* 1 : ACK is required */
        {{0}},                  /* Path info*/
        0                       /* Ethernet unit*/
};

/* Structure to define the default values for the device configuration  */
static SPOSUsrData gtl_device_configuration_3 = {
        NULL,                   /* pointer to next device */
        ePOS_ITF,               /* control interface type to use */
        2,                      /* device ID */
        0,                      /* Version information (not used) */
        eSLAVE,                 /* Slave / Master mode */
        DEV_TYPE_M827XX,        /* Other Slave Device type DEV_TYPE_M823XX, DEV_TYPE_M825XX, DEV_TYPE_M826XX, DEV_TYPE_M829XX */
        True,                   /* Default or custom max channels */
        0,                      /* Max Channels if above flag is custom */
        (POS_PHYID(2)),         /* Physical Identifier */
        ePOSoTSP3,              /* Physical Path Type */
        POS_MAC(POS_PHYID(2)),  /* Device MAC Address */
        HOST_MAC,               /* Host MAC Address (used in MAAS ASSIGN only for CSME Slave) */
        (char *)POS_IF_NAME,    /* Interface name on which communication with device is taking place eg pos0 */
        1,                      /* 1 : ACK is required */
        {{0}},                  /* Path info*/
        0                       /* Ethernet unit*/
};

void set_gtl_config(void)
{
        SPOSUsrData *this_device;

        /* chain devices configuration (if any) */
        gtl_device_configuration_1.pvNext = &gtl_device_configuration_2;
        gtl_device_configuration_2.pvNext = &gtl_device_configuration_3;
        gtl_device_configuration_3.pvNext = NULL;

        /* print the configuation of the device(s) */
        this_device = &gtl_device_configuration_1;
        do
        {
                printf("======================================================\n");
                printf("CONTROL_INTERFACE_TYPE  = %d\n", this_device->usControlInterface);
                printf("DEVICE_ID    = %d\n", this_device->uiDevId);
                printf("DEVICE_MODE  = %d\n", this_device->eDevMode);
                printf("DEVICE_TYPE  = %d\n", this_device->ucDevType);
                printf("USE_DEFAULT_MAX_CHANNEL = %d\n", this_device->bUseDefaultMaxChnls);
                printf("CUSTOM_MAX_CHANNEL = %d\n", this_device->usMaxChannels);
                printf("ACK_REQUIRED = %d\n", this_device->ucIsAckReqd);
                printf("POS PHY ID = %d\n", this_device->ucPhyId);
                printf("POS PATH TYPE = %d\n", this_device->ePathType);
                printf("DEVICE MAC   = %02x:%02x:%02x:%02x:%02x:%02x\n", this_device->aucDevMac[0],
                                                                        this_device->aucDevMac[1],
                                                                        this_device->aucDevMac[2],
                                                                        this_device->aucDevMac[3],
                                                                        this_device->aucDevMac[4],
                                                                        this_device->aucDevMac[5]);
                printf("HOST MAC   = %02x:%02x:%02x:%02x:%02x:%02x\n", this_device->aucHostMac[0],
                                                                        this_device->aucHostMac[1],
                                                                        this_device->aucHostMac[2],
                                                                        this_device->aucHostMac[3],
                                                                        this_device->aucHostMac[4],
                                                                        this_device->aucHostMac[5]);
                printf("HOST_CONTROL_INTERFACE = %s\n", this_device->pucEthDevName);
                printf("ACK_REQUIRED = %d\n", this_device->ucIsAckReqd);
                printf("PATH INFO = %d\n", this_device->PathInfo.Tsp3.DevId);
                printf("ETHERNET UNIT = %d\n", this_device->ether_unit);

                this_device = this_device->pvNext;
        } while (this_device != NULL);

}

....
        VAPI_Init(&gtl_device_configuration_1)
....