digraph G {
    start [label = "boot";];
    
    mb [label = "Detect the main board name";shape = rect;];
    
    mbdts [label = "Load main board device tree";shape = rect;];
    
    ext [label = "Detect the extension module name";shape = rect;];
    extdts [label = "Load a device tree overlay for each module";shape = rect;];
    
    dtsprocess [label = "Add and remove device tree node as needed (DT Fixup)";shape = rect;];
    
    stop [label = "Start UEFI application";];
    
    start -> mb -> mbdts -> ext -> extdts -> dtsprocess -> stop;
}