1/' 2 ' Copyright (c) 2021, Arm Limited. All rights reserved. 3 ' 4 ' SPDX-License-Identifier: BSD-3-Clause 5 '/ 6 7/' 8TF-A Data Flow Diagram 9'/ 10 11@startuml 12digraph tfa_dfd { 13 14 # Arrange nodes from left to right 15 rankdir="LR" 16 17 # Allow arrows to end on cluster boundaries 18 compound=true 19 20 # Default settings for edges and nodes 21 edge [minlen=2 color="#8c1b07"] 22 node [fillcolor="#ffb866" style=filled shape=box fixedsize=true width=1.6 height=0.7] 23 24 # Nodes outside of the trust boundary 25 nsec [label="Non-secure\nClients"] 26 sec [label="Secure\nClients"] 27 dbg [label="Debug & Trace"] 28 logs [label="Logs\n(UART)"] 29 nvm [label="Non-volatile\nMemory"] 30 31 # Trust boundary cluster 32 subgraph cluster_trusted{ 33 graph [style=dashed color="#f22430"] 34 35 # HW IPs cluster 36 subgraph cluster_ip{ 37 label ="Hardware IPs"; 38 graph [style=filled color="#000000" fillcolor="#ffd29e"] 39 40 rank="same" 41 gic [label="GIC" width=1.2 height=0.5] 42 tzc [label="TZ\nController" width=1.2 height=0.5] 43 etc [label="..." shape=none style=none height=0.5] 44 } 45 46 # TF-A cluster 47 subgraph cluster_tfa{ 48 label ="TF-A"; 49 graph [style=filled color="#000000" fillcolor="#faf9cd"] 50 51 bl1 [label="Boot ROM\n(BL1)" fillcolor="#ddffb3"]; 52 bl2 [label="Trusted Boot\nFirmware\n(BL2)" fillcolor="#ddffb3" height=1] 53 bl31 [label="TF-A Runtime\n(BL31)" fillcolor="#ddffb3"] 54 } 55 } 56 57 # Interactions between nodes 58 nvm -> bl31 [lhead=cluster_tfa label="DF1"] 59 logs -> bl31 [dir="back" lhead=cluster_tfa label="DF2"] 60 dbg -> bl2 [dir="both" lhead=cluster_tfa label="DF3"] 61 sec -> bl2 [dir="both" lhead=cluster_tfa label="DF4"] 62 nsec -> bl1 [dir="both" lhead=cluster_tfa, label="DF5"] 63 bl2 -> tzc [dir="both" ltail=cluster_tfa lhead=cluster_ip label="DF6" minlen=1] 64} 65 66@enduml 67