diff --git a/app/oxide-rot-1/app-dev.toml b/app/oxide-rot-1/app-dev.toml
index 50b1263bdd..08cd6ac5bb 100644
--- a/app/oxide-rot-1/app-dev.toml
+++ b/app/oxide-rot-1/app-dev.toml
@@ -79,7 +79,7 @@ name = "drv-lpc55-sprot-server"
 priority = 6
 max-sizes = {flash = 51168, ram = 32768}
 uses = ["flexcomm8", "bootrom"]
-features = ["spi0"]
+features = ["spi0", "sp-ctrl"]
 start = true
 notifications = ["spi-irq"]
 interrupts = {"flexcomm8.hs_spi" = "spi-irq"}
diff --git a/app/oxide-rot-1/app.toml b/app/oxide-rot-1/app.toml
index 7f42aef6ae..cb595ae523 100644
--- a/app/oxide-rot-1/app.toml
+++ b/app/oxide-rot-1/app.toml
@@ -70,7 +70,7 @@ name = "drv-lpc55-sprot-server"
 priority = 6
 max-sizes = {flash = 51168, ram = 32768}
 uses = ["flexcomm8", "bootrom"]
-features = ["spi0"]
+features = ["spi0", "sp-ctrl"]
 start = true
 notifications = ["spi-irq"]
 interrupts = {"flexcomm8.hs_spi" = "spi-irq"}
diff --git a/app/rot-carrier/app.toml b/app/rot-carrier/app.toml
index 20f6e6ee29..7082b0c4c2 100644
--- a/app/rot-carrier/app.toml
+++ b/app/rot-carrier/app.toml
@@ -115,7 +115,7 @@ start = true
 notifications = ["spi-irq"]
 interrupts = {"flexcomm8.hs_spi" = "spi-irq"}
 stacksize = 16384
-task-slots = ["gpio_driver", "syscon_driver", "update_server", "dumper", "attest", "swd"]
+task-slots = ["gpio_driver", "syscon_driver", "update_server", "attest"]
 
 [tasks.sprot.config]
 pins = [
@@ -133,47 +133,6 @@ pins = [
     { name = "SP_RESET", pin = { port = 0, pin = 9}, alt = 0, direction = "input"},
 ]
 
-[tasks.swd]
-name = "drv-lpc55-swd"
-priority = 4
-max-sizes = {flash = 16384, ram = 4096}
-uses = ["flexcomm3", "iocon"]
-start = true
-stacksize = 1000
-notifications = ["spi-irq", "timer"]
-task-slots = ["gpio_driver", "syscon_driver"]
-interrupts = {"flexcomm3.irq" = "spi-irq"}
-
-[tasks.swd.config]
-# MOSI = PIO0_3
-# MISO = PIO0_2
-
-# Out = MOSI on, MISO off
-out_cfg = [
-    { pin = { port = 0, pin = 3 }, alt = 1 },
-    { pin = { port = 0, pin = 2 }, alt = 0, mode = "PullDown" },
-]
-# In = MISO on, MOSI off
-in_cfg = [
-    { pin = { port = 0, pin = 2 }, alt = 1 },
-    { pin = { port = 0, pin = 3 }, alt = 0, mode = "PullDown" },
-]
-pins = [
-    # SCK
-    { pin =  { port = 0, pin = 6 }, alt = 1 },
-    # CS, not strictly necessary but handy for debugging
-    # { pin = {port = 0, pin = 20}, alt =  1},
-]
-spi_num = 3
-
-[tasks.dumper]
-name = "task-dumper"
-priority = 5
-max-sizes = {flash = 16384, ram = 4096}
-start = true
-stacksize = 2600
-task-slots = ["swd"]
-
 [tasks.pong]
 name = "task-pong"
 priority = 7
@@ -185,21 +144,11 @@ notifications = ["timer"]
 [tasks.hiffy]
 name = "task-hiffy"
 priority = 6
-features = ["lpc55", "gpio", "spctrl", "spi"]
+features = ["lpc55", "gpio", "spi"]
 max-sizes = {flash = 32768, ram = 16384 }
 stacksize = 2048
 start = true
-task-slots = ["gpio_driver", "swd", "update_server"]
-
-[tasks.sp_measure]
-name = "task-sp-measure"
-priority = 6
-max-sizes = {flash = 131072, ram = 8192}
-task-slots = ["swd"]
-stacksize = 2048
-
-[tasks.sp_measure.config]
-binary_path = "../../target/gemini-bu/dist/final.bin"
+task-slots = ["gpio_driver", "update_server"]
 
 [tasks.attest]
 name = "task-attest"
diff --git a/drv/lpc55-sprot-server/Cargo.toml b/drv/lpc55-sprot-server/Cargo.toml
index e96d2d3098..0c16f0eae8 100644
--- a/drv/lpc55-sprot-server/Cargo.toml
+++ b/drv/lpc55-sprot-server/Cargo.toml
@@ -20,10 +20,8 @@ drv-lpc55-gpio-api = { path = "../lpc55-gpio-api" }
 drv-lpc55-spi = { path = "../lpc55-spi" }
 drv-lpc55-syscon-api = { path = "../lpc55-syscon-api" }
 drv-lpc55-update-api = { path = "../lpc55-update-api" }
-drv-sp-ctrl-api = { path = "../sp-ctrl-api" }
 drv-sprot-api = { path = "../sprot-api" }
 drv-update-api = { path = "../update-api" }
-dumper-api = { path = "../../task/dumper-api" }
 lpc55_romapi = { path = "../../lib/lpc55-romapi" }
 mutable-statics = { path = "../../lib/mutable-statics" }
 ringbuf = { path = "../../lib/ringbuf" }
@@ -31,6 +29,9 @@ task-jefe-api = { path = "../../task/jefe-api" }
 userlib = { path = "../../sys/userlib" }
 lpc55-rom-data = { path = "../../lib/lpc55-rom-data" }
 
+drv-sp-ctrl-api = { path = "../sp-ctrl-api", optional = true }
+dumper-api = { path = "../../task/dumper-api", optional = true }
+
 [build-dependencies]
 build-lpc55pins = { path = "../../build/lpc55pins" }
 build-util = { path = "../../build/util" }
@@ -41,6 +42,7 @@ idol = { workspace = true }
 [features]
 spi0 = []
 no-ipc-counters = ["idol/no-counters"]
+sp-ctrl = ["drv-sp-ctrl-api", "dumper-api"]
 
 # This section is here to discourage RLS/rust-analyzer from doing test builds,
 # since test builds don't work for cross compilation.
diff --git a/drv/lpc55-sprot-server/src/handler.rs b/drv/lpc55-sprot-server/src/handler.rs
index c29e172b5c..6b86d340e7 100644
--- a/drv/lpc55-sprot-server/src/handler.rs
+++ b/drv/lpc55-sprot-server/src/handler.rs
@@ -6,15 +6,13 @@ use crate::Trace;
 use attest_api::Attest;
 use crc::{Crc, CRC_32_CKSUM};
 use drv_lpc55_update_api::{RotPage, SlotId, Update};
-use drv_sp_ctrl_api::SpCtrl;
 use drv_sprot_api::{
-    AttestReq, AttestRsp, CabooseReq, CabooseRsp, DumpReq, DumpRsp, ReqBody,
-    Request, Response, RotIoStats, RotPageRsp, RotState, RotStatus, RspBody,
+    AttestReq, AttestRsp, CabooseReq, CabooseRsp, DumpReq, ReqBody, Request,
+    Response, RotIoStats, RotPageRsp, RotState, RotStatus, RspBody,
     SprocketsError, SprotError, SprotProtocolError, SwdReq, UpdateReq,
-    UpdateRsp, WatchdogError, CURRENT_VERSION, MIN_VERSION, REQUEST_BUF_SIZE,
+    UpdateRsp, CURRENT_VERSION, MIN_VERSION, REQUEST_BUF_SIZE,
     RESPONSE_BUF_SIZE,
 };
-use dumper_api::Dumper;
 use lpc55_romapi::bootrom;
 use ringbuf::ringbuf_entry_root as ringbuf_entry;
 use sprockets_rot::RotSprocket;
@@ -24,10 +22,12 @@ mod sprockets;
 
 task_slot!(UPDATE_SERVER, update_server);
 
+#[cfg(feature = "sp-ctrl")]
 task_slot!(DUMPER, dumper);
 
 task_slot!(ATTEST, attest);
 
+#[cfg(feature = "sp-ctrl")]
 task_slot!(SP_CTRL, swd);
 
 pub const CRC32: Crc<u32> = Crc::<u32>::new(&CRC_32_CKSUM);
@@ -60,7 +60,9 @@ pub struct Handler {
     update: Update,
     startup_state: StartupState,
     attest: Attest,
-    sp_ctrl: SpCtrl,
+
+    #[cfg(feature = "sp-ctrl")]
+    sp_ctrl: drv_sp_ctrl_api::SpCtrl,
 }
 
 impl<'a> Handler {
@@ -74,7 +76,9 @@ impl<'a> Handler {
                 max_response_size: RESPONSE_BUF_SIZE.try_into().unwrap_lite(),
             },
             attest: Attest::from(ATTEST.get_task_id()),
-            sp_ctrl: SpCtrl::from(SP_CTRL.get_task_id()),
+
+            #[cfg(feature = "sp-ctrl")]
+            sp_ctrl: drv_sp_ctrl_api::SpCtrl::from(SP_CTRL.get_task_id()),
         }
     }
 
@@ -269,10 +273,24 @@ impl<'a> Handler {
                 None,
             )),
             ReqBody::Dump(DumpReq::V1 { addr }) => {
-                ringbuf_entry!(Trace::Dump(addr));
-                let dumper = Dumper::from(DUMPER.get_task_id());
-                let err = dumper.dump(addr).err();
-                Ok((RspBody::Dump(DumpRsp::V1 { err }), None))
+                #[cfg(feature = "sp-ctrl")]
+                {
+                    use dumper_api::Dumper;
+                    ringbuf_entry!(Trace::Dump(addr));
+                    let dumper = Dumper::from(DUMPER.get_task_id());
+                    let err = dumper.dump(addr).err();
+                    Ok((
+                        RspBody::Dump(drv_sprot_api::DumpRsp::V1 { err }),
+                        None,
+                    ))
+                }
+                #[cfg(not(feature = "sp-ctrl"))]
+                {
+                    let _ = addr;
+                    Err(SprotError::Protocol(
+                        SprotProtocolError::BadMessageType,
+                    ))
+                }
             }
             ReqBody::Update(UpdateReq::GetBlockSize) => {
                 let size = self.update.block_size()?;
@@ -415,16 +433,33 @@ impl<'a> Handler {
                 // Enabling the watchdog doesn't actually do any SWD work, but
                 // we'll call `setup()` now to make sure that the SWD system is
                 // working.
+                #[cfg(feature = "sp-ctrl")]
                 match self.sp_ctrl.setup().and_then(|()| {
                     self.sp_ctrl.enable_sp_slot_watchdog(time_ms)
                 }) {
                     Ok(()) => Ok((RspBody::Ok, None)),
-                    Err(_e) => Err(SprotError::Watchdog(WatchdogError::SpCtrl)),
+                    Err(_e) => Err(SprotError::Watchdog(
+                        drv_sprot_api::WatchdogError::SpCtrl,
+                    )),
+                }
+
+                #[cfg(not(feature = "sp-ctrl"))]
+                {
+                    let _ = time_ms;
+                    Err(SprotError::Protocol(
+                        SprotProtocolError::BadMessageType,
+                    ))
                 }
             }
             ReqBody::Swd(SwdReq::DisableSpSlotWatchdog) => {
-                self.sp_ctrl.disable_sp_slot_watchdog();
-                Ok((RspBody::Ok, None))
+                #[cfg(feature = "sp-ctrl")]
+                {
+                    self.sp_ctrl.disable_sp_slot_watchdog();
+                    Ok((RspBody::Ok, None))
+                }
+
+                #[cfg(not(feature = "sp-ctrl"))]
+                Err(SprotError::Protocol(SprotProtocolError::BadMessageType))
             }
         }
     }
diff --git a/drv/lpc55-sprot-server/src/main.rs b/drv/lpc55-sprot-server/src/main.rs
index 7c60463929..b25040321a 100644
--- a/drv/lpc55-sprot-server/src/main.rs
+++ b/drv/lpc55-sprot-server/src/main.rs
@@ -67,7 +67,6 @@ use handler::Handler;
 #[derive(Copy, Clone, PartialEq)]
 pub(crate) enum Trace {
     None,
-    Dump(u32),
     ReceivedBytes(usize),
     Flush,
     FlowError,
@@ -76,6 +75,9 @@ pub(crate) enum Trace {
     Err(SprotProtocolError),
     Stats(RotIoStats),
     Desynchronized,
+
+    #[cfg(feature = "sp-ctrl")]
+    Dump(u32),
 }
 ringbuf!(Trace, 32, Trace::None);
 
diff --git a/drv/lpc55-swd/src/main.rs b/drv/lpc55-swd/src/main.rs
index 77335f3fe6..f65fac92f6 100644
--- a/drv/lpc55-swd/src/main.rs
+++ b/drv/lpc55-swd/src/main.rs
@@ -775,18 +775,10 @@ impl ServerImpl {
     }
 
     fn swd_dongle_detected(&self) -> bool {
-        cfg_if::cfg_if! {
-            if #[cfg(any(
-                target_board = "oxide-rot-1",
-            ))] {
-                use drv_lpc55_gpio_api::*;
-
-                let gpio = Pins::from(self.gpio);
-                gpio.read_val(SP_TO_ROT_JTAG_DETECT_L) == Value::Zero
-            } else {
-                false
-            }
-        }
+        use drv_lpc55_gpio_api::*;
+
+        let gpio = Pins::from(self.gpio);
+        gpio.read_val(SP_TO_ROT_JTAG_DETECT_L) == Value::Zero
     }
 
     fn swd_setup(&mut self) -> Result<(), Ack> {