Add PEAK PCAN-USB entry to BOM

docs/BOM.md

@@ -3,4 +3,20 @@ type: default
 ---
 # Bill of Materials
 
-> Placeholder — to be filled as components are selected.
+## PEAK-System PCAN-USB
+
+| Field | Value |
+|-------|-------|
+| **Manufacturer** | PEAK-System Technik GmbH |
+| **Model** | PCAN-USB |
+| **USB ID** | `0c72:000c` |
+| **Purpose** | USB-to-CAN adapter for reading car CAN bus traffic |
+| **Interface** | SocketCAN netdev (`can1`) |
+| **Default bitrate** | 500 kbps |
+| **Driver** | PEAK proprietary driver 9.2.0 (netdev build) — out-of-tree module, must be rebuilt after kernel updates |
+
+### Notes
+
+- The mainline kernel driver `peak_usb` is not compiled into the NVIDIA Tegra kernel (JetPack r36.4), so PEAK's proprietary driver is required.
+- Must be built with `NET=NETDEV_SUPPORT` for standard SocketCAN tools (`candump`, `ip link`, etc.).
+- The module lives at `/lib/modules/$(uname -r)/misc/pcan.ko` and is loaded via `modprobe pcan`.