Support for observer-a

app/observer/Cargo.toml

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+[package]
+edition = "2024"
+readme = "README.md"
+name = "observer"
+version = "0.1.0"
+
+[features]
+dump = ["kern/dump"]
+measurement-handoff = ["drv-stm32h7-startup/measurement-handoff"]
+
+[dependencies]
+cfg-if = { workspace = true }
+cortex-m = { workspace = true }
+cortex-m-rt = { workspace = true }
+stm32h7 = { workspace = true, features = ["rt", "stm32h753"] }
+
+drv-stm32h7-startup = { path = "../../drv/stm32h7-startup", features = ["h753"] }
+kern = { path = "../../sys/kern" }
+
+[build-dependencies]
+build-util = {path = "../../build/util"}
+
+# this lets you use `cargo fix`!
+[[bin]]
+name = "observer"
+test = false
+doctest = false
+bench = false
+
+[lints]
+workspace = true

app/observer/README.md

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+# Observer Service Processor (SP) firmware
+
+The Observer interfaces with the power shelf in the Oxide rack.
+This hardware is the successor to the Power Shelf Controller (PSC).
+
+This folder contains the firmware that runs on its service processor (SP).
+
+The Root of Trust firmware is common across multiple boards and can be found
+in the [`oxide-rot-1` subfolder](../oxide-rot-1).