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bcf682ccbe
Removes legacy UML diagram image in favour of PlantUML description using plain text. Signed-off-by: Matteo Golin <matteo.golin@gmail.com>
55 lines
2.2 KiB
ReStructuredText
55 lines
2.2 KiB
ReStructuredText
The diagram of boot sequence
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============================
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The premise of this sequence diagram is NuttX12.4.0, cxd56xx, non-SMP and Flat build.
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The beginning of boot sequence is ``__start()``.
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``__start()`` will call ``nx_start()``. ``nx_start()`` will initialize the
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kernel and call ``nsh_main()``. ``nsh_main()`` will execute NuttShell(NSH).
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``nx_start()`` is NuttX standard function, but the behavior depends on some
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kernel configurations. For example, the calling ``nsh_main()`` is also
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configurable. About related kernel configurations, see
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:doc:`/guides/port_relatedkernelconfigrations`.
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.. uml::
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bootloader --> cxd56_start.c : Jump to __start by function call or de-assert the reset signal of CM4F
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note over cxd56_start.c : Initialize SP
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note over cxd56_start.c : Disable IRQ @processor level
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note over cxd56_start.c : Initialize .data/.bss
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note over cxd56_start.c : cxd56_board_initialize() as <arch>_board_initialize()
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cxd56_start.c --> nx_start.c : nx_start()
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note over nx_start.c : Initialize IDLE task TCB
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note over nx_start.c : nxsem_initialize()
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note over nx_start.c : Initialize HEAP
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note over nx_start.c : Create and initialize IDLE group instance
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note over nx_start.c : sched_lock()
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note over nx_start.c : fs_initialize()
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note over nx_start.c : irq_initialize()
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note over nx_start.c : clock_initialize()
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note over nx_start.c : timer_initialize()
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note over nx_start.c : nxsig_initialize()
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note over nx_start.c : nxmq_initialize()
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note over nx_start.c : net_initialize()
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note over nx_start.c : binfmt_initialize()
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note over nx_start.c : up_initialize()
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note over nx_start.c : drivers_initialize()
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note over nx_start.c : board_early_initialize()
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note over nx_start.c : Initialize SDIO for IDLE task
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nx_start.c --> nx_bringup.c : nx_bringup()
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note over nx_bringup.c : Initialize environment variables (PWD, PATH, LD_LIBRARY_PATH)
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note over nx_bringup.c : Start work queues
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nx_bringup.c --> nx_start_application : nx_start_task()
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note over nx_start_application : board_late_initialize()
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note over nx_start_application : coredump_initialize()
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note over nx_start_application : Start nsh_main() as the application initialization task
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note over nx_start.c : up_idle()
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