diff --git a/Cargo.lock b/Cargo.lock
index db19075cde..8753d649b4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2144,6 +2144,7 @@ dependencies = [
  "idol",
  "num-derive 0.4.2",
  "num-traits",
+ "ringbuf",
  "serde",
  "serde_json",
  "userlib",
diff --git a/drv/sidecar-mainboard-controller/Cargo.toml b/drv/sidecar-mainboard-controller/Cargo.toml
index bb03fc148d..eb8a4301bb 100644
--- a/drv/sidecar-mainboard-controller/Cargo.toml
+++ b/drv/sidecar-mainboard-controller/Cargo.toml
@@ -17,6 +17,7 @@ drv-fpga-api = { path = "../fpga-api" }
 drv-fpga-user-api = { path = "../fpga-user-api" }
 drv-ignition-api = { path = "../ignition-api" }
 userlib = { path = "../../sys/userlib" }
+ringbuf = { path = "../../lib/ringbuf" }
 
 [features]
 bitstream = ["dep:drv-auxflash-api", "drv-fpga-api/auxflash"]
diff --git a/drv/sidecar-mainboard-controller/src/tofino2.rs b/drv/sidecar-mainboard-controller/src/tofino2.rs
index 8f0cae5788..4139727f7e 100644
--- a/drv/sidecar-mainboard-controller/src/tofino2.rs
+++ b/drv/sidecar-mainboard-controller/src/tofino2.rs
@@ -10,6 +10,14 @@ use drv_fpga_user_api::power_rail::*;
 use userlib::FromPrimitive;
 use zerocopy::{FromBytes, Immutable, IntoBytes, KnownLayout};
 
+#[derive(Copy, Clone, PartialEq)]
+enum VidTrace {
+    None,
+    Read(u8),
+}
+
+ringbuf::ringbuf!(VidTrace, 8, VidTrace::None);
+
 #[derive(
     Copy,
     Clone,
@@ -335,6 +343,8 @@ impl Sequencer {
     pub fn vid(&self) -> Result<Option<Tofino2Vid>, FpgaError> {
         let v: u8 = self.fpga.read(Addr::TOFINO_POWER_VID)?;
 
+        ringbuf::ringbuf_entry!(VidTrace::Read(v));
+
         if (v & Reg::TOFINO_POWER_VID::VID_VALID) != 0 {
             match Tofino2Vid::from_u8(v & Reg::TOFINO_POWER_VID::VID) {
                 None => Err(FpgaError::InvalidValue),