hal: add startup()

diff --git a/src/rust/bitbox-hal/src/system.rs b/src/rust/bitbox-hal/src/system.rs
index a2e6bee..c04a0f1 100644
--- a/src/rust/bitbox-hal/src/system.rs
+++ b/src/rust/bitbox-hal/src/system.rs
@@ -1,5 +1,9 @@
 // SPDX-License-Identifier: Apache-2.0
 
+#[allow(async_fn_in_trait)]
 pub trait System {
+    /// Runs device-specific startup UI/initialization before regular operation.
+    async fn startup();
+
     fn reboot_to_bootloader(&mut self) -> !;
 }
diff --git a/src/rust/bitbox02-rust/src/hal/testing/system.rs b/src/rust/bitbox02-rust/src/hal/testing/system.rs
index e68e2db..804bbd9 100644
--- a/src/rust/bitbox02-rust/src/hal/testing/system.rs
+++ b/src/rust/bitbox02-rust/src/hal/testing/system.rs
@@ -9,6 +9,8 @@ impl TestingSystem {
 }
 
 impl crate::hal::System for TestingSystem {
+    async fn startup() {}
+
     fn reboot_to_bootloader(&mut self) -> ! {
         panic!("reboot_to_bootloader called")
     }
diff --git a/src/rust/bitbox02-rust/src/main_loop.rs b/src/rust/bitbox02-rust/src/main_loop.rs
index 3d46334..54482f0 100644
--- a/src/rust/bitbox02-rust/src/main_loop.rs
+++ b/src/rust/bitbox02-rust/src/main_loop.rs
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0
 
-use crate::hal::Memory;
+use crate::hal::{Memory, System};
 use alloc::boxed::Box;
 use bitbox_executor::Executor;
 use bitbox02::ringbuffer::RingBuffer;
@@ -20,8 +20,8 @@ pub fn spawn(fut: DynExecutorFuture) {
     EXECUTOR.spawn(fut).detach();
 }
 
-pub fn main_loop(hal: &mut impl crate::hal::Hal) -> ! {
-    static ORIENTATION_CHOSEN: AtomicBool = AtomicBool::new(false);
+pub fn main_loop<H: crate::hal::Hal>(hal: &mut H) -> ! {
+    static STARTUP_COMPLETE: AtomicBool = AtomicBool::new(false);
 
     // Set the size of uart_read_buf to the size of the ringbuffer in the UART driver so we can read
     // out all bytes
@@ -36,10 +36,10 @@ pub fn main_loop(hal: &mut impl crate::hal::Hal) -> ! {
     let device_name = hal.memory().get_device_name();
     bitbox02::da14531::set_name(&device_name, &mut uart_write_queue);
 
-    // This starts the async orientation screen workflow, which is processed by the loop below.
+    // This starts the async startup workflow, which is processed by the loop below.
     spawn(Box::pin(async {
-        crate::workflow::orientation_screen::orientation_screen().await;
-        ORIENTATION_CHOSEN.store(true, Ordering::Relaxed);
+        H::System::startup().await;
+        STARTUP_COMPLETE.store(true, Ordering::Relaxed);
     }));
 
     let mut hww_data = None;
@@ -161,7 +161,7 @@ pub fn main_loop(hal: &mut impl crate::hal::Hal) -> ! {
         // Run async executor
         EXECUTOR.try_tick();
 
-        if ORIENTATION_CHOSEN.swap(false, Ordering::Relaxed) {
+        if STARTUP_COMPLETE.swap(false, Ordering::Relaxed) {
             // hww handler in usb_process must be setup before we can allow ble connections
             if let Ok(crate::hal::memory::Platform::BitBox02Plus) = hal.memory().get_platform() {
                 let product = bitbox02::platform::product();
diff --git a/src/rust/bitbox02-rust/src/workflow.rs b/src/rust/bitbox02-rust/src/workflow.rs
index 527c479..2237bea 100644
--- a/src/rust/bitbox02-rust/src/workflow.rs
+++ b/src/rust/bitbox02-rust/src/workflow.rs
@@ -5,7 +5,6 @@
     path = "workflow/mnemonic_c_unit_tests.rs"
 )]
 pub mod mnemonic;
-pub mod orientation_screen;
 pub mod pairing;
 pub mod password;
 pub mod transaction;
diff --git a/src/rust/bitbox02-rust/src/workflow/orientation_screen.rs b/src/rust/bitbox02-rust/src/workflow/orientation_screen.rs
deleted file mode 100644
index 210a380..0000000
--- a/src/rust/bitbox02-rust/src/workflow/orientation_screen.rs
+++ /dev/null
@@ -1,20 +0,0 @@
-// SPDX-License-Identifier: Apache-2.0
-
-use bitbox02::delay::delay_for;
-use bitbox02::ui::choose_orientation;
-use core::time::Duration;
-
-pub async fn orientation_screen() -> bool {
-    let upside_down = choose_orientation().await;
-    if upside_down {
-        bitbox02::screen_rotate()
-    }
-
-    // During this delay the bb02 logotype is shown
-    delay_for(Duration::from_millis(1300)).await;
-
-    // Switch to lockscreen that shows "See the bitbox app" and device name
-    bitbox02::ui::screen_process_waiting_switch_to_lockscreen();
-
-    upside_down
-}
diff --git a/src/rust/bitbox02/src/hal/system.rs b/src/rust/bitbox02/src/hal/system.rs
index 4f53c3b..a81efdc 100644
--- a/src/rust/bitbox02/src/hal/system.rs
+++ b/src/rust/bitbox02/src/hal/system.rs
@@ -1,10 +1,24 @@
 // SPDX-License-Identifier: Apache-2.0
 
 use bitbox_hal::System;
+use core::time::Duration;
 
 pub struct BitBox02System;
 
 impl System for BitBox02System {
+    async fn startup() {
+        let upside_down = crate::ui::choose_orientation().await;
+        if upside_down {
+            crate::screen_rotate();
+        }
+
+        // During this delay the bb02 logotype is shown.
+        crate::delay::delay_for(Duration::from_millis(1300)).await;
+
+        // Switch to lockscreen that shows "See the bitbox app" and device name.
+        crate::ui::screen_process_waiting_switch_to_lockscreen();
+    }
+
     fn reboot_to_bootloader(&mut self) -> ! {
         crate::reboot_to_bootloader()
     }
diff --git a/test/simulator-graphical-bb03/src/main.rs b/test/simulator-graphical-bb03/src/main.rs
index 6cfe487..d332c46 100644
--- a/test/simulator-graphical-bb03/src/main.rs
+++ b/test/simulator-graphical-bb03/src/main.rs
@@ -38,7 +38,7 @@ use tracing::{debug, error, info};
 use tracing_subscriber::{EnvFilter, filter::LevelFilter, fmt, prelude::*};
 
 use bitbox02::ui::ugui::UG_COLOR;
-use bitbox02_rust::hal::{Hal, Memory};
+use bitbox02_rust::hal::{Hal, Memory, System};
 
 // Explicitly link library for its C exports
 extern crate bitbox02_rust_c;
@@ -184,7 +184,7 @@ struct App {
     cursor_pos: (i32, i32),
     outbound_in: Option<mpsc::Sender<[u8; 64]>>,
     inbound_out: Option<mpsc::Receiver<[u8; 64]>>,
-    orientation_task: Option<util::bb02_async::Task<'static, bool>>,
+    startup_task: Option<util::bb02_async::Task<'static, ()>>,
 }
 
 impl Default for App {
@@ -200,7 +200,7 @@ impl Default for App {
             cursor_pos: (0, 0),
             outbound_in: Default::default(),
             inbound_out: Default::default(),
-            orientation_task: Default::default(),
+            startup_task: Default::default(),
         }
     }
 }
@@ -528,10 +528,10 @@ impl ApplicationHandler<UserEvent> for App {
                 bitbox02::usb_processing::process_hww();
                 bitbox02::screen::process();
 
-                if let Some(ref mut task) = self.orientation_task {
-                    if let Ready(_orientation) = util::bb02_async::spin(task) {
+                if let Some(ref mut task) = self.startup_task {
+                    if let Ready(_startup) = util::bb02_async::spin(task) {
                         ACCEPTING_CONNECTIONS.store(true, Ordering::Relaxed);
-                        self.orientation_task = None;
+                        self.startup_task = None;
                     }
                 }
 
@@ -560,9 +560,7 @@ impl ApplicationHandler<UserEvent> for App {
     fn resumed(&mut self, event_loop: &ActiveEventLoop) {
         self.create_window(event_loop, None)
             .expect("failed to create initial window");
-        self.orientation_task = Some(Box::pin(
-            bitbox02_rust::workflow::orientation_screen::orientation_screen(),
-        ));
+        self.startup_task = Some(Box::pin(bitbox02::hal::system::BitBox02System::startup()));
     }
 }
 
diff --git a/test/simulator-graphical/src/main.rs b/test/simulator-graphical/src/main.rs
index f92eea1..9ad349a 100644
--- a/test/simulator-graphical/src/main.rs
+++ b/test/simulator-graphical/src/main.rs
@@ -39,7 +39,7 @@ use tracing::{debug, error, info};
 use tracing_subscriber::{EnvFilter, filter::LevelFilter, fmt, prelude::*};
 
 use bitbox02::ui::ugui::UG_COLOR;
-use bitbox02_rust::hal::{Hal, Memory};
+use bitbox02_rust::hal::{Hal, Memory, System};
 
 // Explicitly link library for its C exports
 extern crate bitbox02_rust_c;
@@ -220,7 +220,7 @@ struct App {
     mouse_last_y: i32,
     outbound_in: Option<mpsc::Sender<[u8; 64]>>,
     inbound_out: Option<mpsc::Receiver<[u8; 64]>>,
-    orientation_task: Option<util::bb02_async::Task<'static, bool>>,
+    startup_task: Option<util::bb02_async::Task<'static, ()>>,
 }
 
 impl Default for App {
@@ -239,7 +239,7 @@ impl Default for App {
             mouse_last_y: 0,
             outbound_in: Default::default(),
             inbound_out: Default::default(),
-            orientation_task: Default::default(),
+            startup_task: Default::default(),
         }
     }
 }
@@ -659,10 +659,10 @@ impl ApplicationHandler<UserEvent> for App {
                 bitbox02::usb_processing::process_hww();
                 bitbox02::screen::process();
 
-                if let Some(ref mut task) = self.orientation_task {
-                    if let Ready(_orientation) = util::bb02_async::spin(task) {
+                if let Some(ref mut task) = self.startup_task {
+                    if let Ready(_startup) = util::bb02_async::spin(task) {
                         ACCEPTING_CONNECTIONS.store(true, Ordering::Relaxed);
-                        self.orientation_task = None;
+                        self.startup_task = None;
                     }
                 }
 
@@ -691,9 +691,7 @@ impl ApplicationHandler<UserEvent> for App {
     fn resumed(&mut self, event_loop: &ActiveEventLoop) {
         self.create_window(event_loop, None)
             .expect("failed to create initial window");
-        self.orientation_task = Some(Box::pin(
-            bitbox02_rust::workflow::orientation_screen::orientation_screen(),
-        ));
+        self.startup_task = Some(Box::pin(bitbox02::hal::system::BitBox02System::startup()));
     }
 }