Hardware

The Start9 router is built on the SpacemiT K1, an eight-core RISC-V processor. This page publishes the K1 schematic the router’s board descends from, and records where the router you own differs from it.

Specifications

Schematic

SpacemiT K1 reference schematic (PDF, 28 sheets)

This is SpacemiT’s SPACEMIT-K1_LP4XP200_32X1 design, revision V3.0, dated April 2024. It documents the power tree, the clock and GPIO maps, the processor, memory and storage, and the peripheral interfaces the K1 supports. StartWRT boots the k1-x_deb1 device tree, which describes this same design.

Why It Differs From Your Router

A schematic is a design document, not a parts list for the unit on your desk. Two ordinary things put distance between the two.

A reference design carries every option; a product populates a subset. The schematic draws every interface the processor can drive, so that anyone building on the K1 can see how each one is wired. A finished product fits only the parts it uses. Nothing is removed from the drawing — the rest is simply never populated.

Parts get substituted. Regulators, transistors and passives are second-sourced routinely, and a pin-compatible replacement drops into the same footprint without anyone redrawing a sheet. Memory is the most visible case: capacity variants of one package are interchangeable, so the density printed on a schematic is not necessarily the density installed.

Note

Read the schematic as documentation of the platform, not as a bill of materials for your router.

Notable Differences

What the Schematic Does Not Cover

The schematic shows how components connect. It is not the circuit board layout: it does not include the copper artwork or the layer stackup, nor the bill of materials naming the specific parts fitted to a production run.