Documenting startup and multi NPU
Adding documentation and sequence diagrams for startup and multi
NPU.
Change-Id: I4a4a43e8bea089b6325f7d8285434017cbda25ec
diff --git a/docs/startup.puml b/docs/startup.puml
new file mode 100644
index 0000000..f9cb528
--- /dev/null
+++ b/docs/startup.puml
@@ -0,0 +1,71 @@
+@startuml
+
+skinparam backgroundColor #EEEBDC
+
+box "Hardware" #FFC700
+participant "Cortex-M" as cortexm
+participant "Ethos-U" as ethosu
+end box
+
+box "CMSIS Device" #0091BD
+participant "__VECTOR_TABLE" as ivec
+participant "Reset_Handler()" as reset
+end box
+
+box "Compiler" #FF6B00
+participant "Runtime" as runtime
+end box
+
+box "Target" #95D600
+participant "common" as common
+participant "corstone-300" as target
+end box
+
+box "Drivers" #00C1DE
+participant "NPU" as driver
+participant "UART" as uart
+participant "MPU" as mpu
+end box
+
+box "Application" #7D868C
+participant "main()" as main
+end box
+
+cortexm -> ivec++:
+ ivec -> reset++: Reset_Handler()
+ reset -> reset++: SystemInit()
+ deactivate reset
+
+ reset -> runtime++: __main()
+ note over runtime
+ Scatter loading
+ Initializing stack and heap
+ end note
+
+ note over runtime
+ Calling constructors
+ end note
+
+ runtime -> common++: init() [constructor]
+ note over common
+ The constructor is called after stack and heap have been initialized,
+ but before the main() function is called
+ end note
+
+ common -> target++: targetSetup()
+ target -> uart++: uart_init()
+ return
+
+ target -> driver++: ethosu_init()
+ return
+
+ target -> mpu++: loadAndEnableConfig()
+ return
+ return
+ return
+
+ runtime -> main++: main()
+ note over main
+ Running application
+ end note
+@enduml