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== start-up / sequencing during OsmoBTS start
The start-up procedure of OsmoBTS can be described as follows:
|===
| bts-specific | main() |
| common | bts_main() | initialization of talloc contexts
| common | osmo_init_logging2() | initialization of logging
| common | handle_options() | common option parsing
| bts-specific | bts_model_handle_options() | model-specific option parsing
| common | gsm_bts_alloc() | allocation of BTS/TRX/TS data structures
| common | vty_init() | Initialziation of VTY core, libosmo-abis and osmo-bts VTY
| common | main() | Setting of scheduler RR priority (if configured)
| common | main() | Initialization of GSMTAP (if configured)
| common | bts_init() | configuration of defaults in bts/trx/s object
| bts-specific | bts_model_init | ?
| common | abis_init() | Initialization of libosmo-abis
| common | vty_read_config_file() | Reading of configuration file
| bts-specific | bts_model_phy_link_set_defaults() | Called for every PHY link created
| bts-specific | bts_model_phy_instance_set_defaults() | Called for every PHY Instance created
| common | bts_controlif_setup() | Initialization of Control Interface
| bts-specific | bts_model_ctrl_cmds_install()
| common | telnet_init() | Initialization of telnet interface
| common | pcu_sock_init() | Initializaiton of PCU socket
| common | main() | Installation of signal handlers
| common | abis_open() | Start of the A-bis connection to BSC
| common | phy_links_open() | Iterate over list of configured PHY links
| bts-specific | bts_model_phy_link_open() | Open each of the configured PHY links
| common | write_pid_file() | Generate the pid file
| common | osmo_daemonize() | Fork as daemon in background (if configured)
| common | bts_main() | Run main loop until global variable quit >= 2
| bts-specific | bts_model_oml_estab() | Called by core once OML link is established
| bts-specific | bts_model_check_oml() | called each time OML sets some attributes on a MO, checks if attributes are valid
| bts-specific | bts_model_apply_oml() | called each time OML sets some attributes on a MO, stores attribute contents in data structures
| bts-specific | bts_model_opstart() | for NM_OC_BTS, NM_OC_SITE_MANAGER, NM_OC_GPRS_NSE, NM_OC_GPRS_CELL, NMO_OC_GPRS_NSVC
| bts-specific | bts_model_opstart() | for NM_OC_RADIO_CARRIER for each trx
| bts-specific | bts_model_opstart() | for NM_OC_BASEB_TRANSC for each trx
| bts-specific | bts_model_opstart() | for NM_OC_CHANNEL for each timeslot on each trx
| bts-specific | bts_model_change_power() | change transmit power for each trx (power ramp-up/ramp-down
| bts-specific | bts_model_abis_close() | called when either one of the RSL links or the OML link are down
|
