| @startuml |
| skinparam ParticipantPadding 10 |
| skinparam BoxPadding 10 |
| box RSS |
| participant RSS_BL1_1 |
| participant RSS_BL1_2 |
| participant RSS_BL2 |
| participant RSS_S |
| endbox |
| box SCP |
| participant SCP_BL1 |
| endbox |
| box AP |
| participant AP_BL1 |
| participant AP_BL2 |
| participant AP_BL31 |
| endbox |
| |
| == RSS Boot phase == |
| -> RSS_BL1_1: Reset |
| Rnote over RSS_BL1_1: ROM code, XIP |
| Rnote over RSS_BL1_2: OTP code, XIP |
| Rnote over RSS_BL2, AP_BL31: Stored in flash, loaded and executed in RAM |
| activate RSS_BL1_1 #Green |
| RSS_BL1_1 -->> RSS_BL1_2: Validate, measure |
| Rnote over RSS_BL1_1: BL1_2 measurement\n\ saved to a shared buffer |
| RSS_BL1_1 -> RSS_BL1_2: Pass execution |
| deactivate RSS_BL1_1 |
| activate RSS_BL1_2 #Green |
| RSS_BL1_2 -->> RSS_BL2: Validate, measure, load |
| Rnote over RSS_BL1_2: RSS_BL2 measurement\n\ saved to a shared buffer |
| RSS_BL1_2 -> RSS_BL2: Pass execution |
| deactivate RSS_BL1_2 |
| activate RSS_BL2 #Green |
| RSS_BL2 -->> RSS_S: Validate, measure, load |
| RSS_BL2 -->> SCP_BL1: Validate, measure, load |
| Rnote over RSS_BL2: RSS_S and SCP_BL1\n\ measurements saved\n\ to a shared buffer |
| RSS_BL2 -> SCP_BL1: Release from reset |
| activate SCP_BL1 #Green |
| Rnote over RSS_BL2, SCP_BL1: MHU init between RSS and SCP |
| Rnote over SCP_BL1: Configure memory |
| Rnote over RSS_BL2: Waits for SCP |
| SCP_BL1 --> RSS_BL2: Done |
| RSS_BL2 -->> AP_BL1: Validate, measure, load |
| Rnote over RSS_BL2: AP_BL1 measurement\n\ saved to a shared buffer |
| RSS_BL2 -> AP_BL1: Release from reset |
| activate AP_BL1 #Green |
| RSS_BL2 -> RSS_S: Pass execution |
| deactivate RSS_BL2 |
| activate RSS_S #Green |
| Rnote over RSS_S: Measurements read from\n\ shared buffer and saved by\n\ |
| Measured Boot service to\n\ measurement slots. |
| |
| == RSS Runtime / AP Boot phase == |
| Rnote over RSS_S, AP_BL1: MHU init between RSS and AP |
| Rnote over AP_BL1: Measure and load:\n\ FW_CONFIG\n\ TB_FW_CONFIG |
| AP_BL1 -> RSS_S: Extend measurement |
| Rnote over RSS_S: Measured Boot:\n\ store measurement |
| AP_BL1 -->> AP_BL2: Validate, measure,load |
| AP_BL1 -> RSS_S: Extend measurement |
| Rnote over RSS_S: Measured Boot:\n\ store measurement |
| AP_BL1 -> AP_BL2: Pass execution |
| deactivate AP_BL1 |
| activate AP_BL2 #Green |
| Rnote over AP_BL2: Measure and load:\n\ HW_CONFIG |
| AP_BL2 -> RSS_S: Extend measurement |
| Rnote over RSS_S: Measured Boot:\n\ store measurement |
| AP_BL2 -->> AP_BL31: Validate, measure,load |
| Rnote over AP_BL2: Measure and load:\n\ BL31 |
| AP_BL2 -> RSS_S: Extend measurement |
| Rnote over RSS_S: Measured Boot:\n\ store measurement |
| Rnote over AP_BL2: Measure and load:\n\ RMM |
| AP_BL2 -> RSS_S: Extend measurement |
| Rnote over RSS_S: Measured Boot:\n\ store measurement |
| AP_BL2 -> AP_BL31: Pass execution |
| deactivate AP_BL2 |
| activate AP_BL31 #Green |
| == RSS / AP Runtime == |
| @enduml |