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/'
' Copyright (c) 2021, Arm Limited. All rights reserved.
'
' SPDX-License-Identifier: BSD-3-Clause
'/
/'
TF-A Data Flow Diagram
'/
@startuml
digraph tfa_dfd {
# Arrange nodes from left to right
rankdir="LR"
# Allow arrows to end on cluster boundaries
compound=true
# Default settings for edges and nodes
edge [minlen=2 color="#8c1b07"]
node [fillcolor="#ffb866" style=filled shape=box fixedsize=true width=1.6 height=0.7]
# Nodes outside of the trust boundary
nsec [label="Non-secure\nClients"]
sec [label="Secure\nClients"]
dbg [label="Debug & Trace"]
logs [label="Logs\n(UART)"]
nvm [label="Non-volatile\nMemory"]
# Trust boundary cluster
subgraph cluster_trusted{
graph [style=dashed color="#f22430"]
# HW IPs cluster
subgraph cluster_ip{
label ="Hardware IPs";
graph [style=filled color="#000000" fillcolor="#ffd29e"]
rank="same"
gic [label="GIC" width=1.2 height=0.5]
tzc [label="TZ\nController" width=1.2 height=0.5]
etc [label="..." shape=none style=none height=0.5]
}
# TF-A cluster
subgraph cluster_tfa{
label ="TF-A";
graph [style=filled color="#000000" fillcolor="#faf9cd"]
bl1 [label="Boot ROM\n(BL1)" fillcolor="#ddffb3"];
bl2 [label="Trusted Boot\nFirmware\n(BL2)" fillcolor="#ddffb3" height=1]
bl31 [label="TF-A Runtime\n(BL31)" fillcolor="#ddffb3"]
}
}
# Interactions between nodes
nvm -> bl31 [lhead=cluster_tfa label="DF1"]
logs -> bl31 [dir="back" lhead=cluster_tfa label="DF2"]
dbg -> bl2 [dir="both" lhead=cluster_tfa label="DF3"]
sec -> bl2 [dir="both" lhead=cluster_tfa label="DF4"]
nsec -> bl1 [dir="both" lhead=cluster_tfa, label="DF5"]
bl2 -> tzc [dir="both" ltail=cluster_tfa lhead=cluster_ip label="DF6" minlen=1]
}
@enduml
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