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docs(remote-ui): add Pi 400 as a supported target for square/ (ref #127)

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Pi 400 shares BCM2711 with Pi 4B, runs the same arm64 image. DTB
auto-selection picks bcm2711-rpi-400.dtb at boot. firstboot.sh records
the board flavour. USB peripheral mode requirement (GPIO 5V power) is
unchanged. Integrated keyboard is recognised via libinput.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
CyberMind-FR 2026-05-13 08:43:52 +02:00
parent 7ae5e82345
commit ba5ea4626b
1 changed files with 15 additions and 6 deletions
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21
docs/superpowers/specs/2026-05-13-eye-square-variant-design.md
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@ -37,20 +37,29 @@ The host-side `RemoteUIManager` adds a `form_factor: "round" | "square"` field t
### Phase 2 — add `remote-ui/square/` (purely additive)
New sibling targeting:
New sibling targeting two boards that share the same BCM2711 SoC and image:
| | Pi 4 Model B (primary bench target) | Pi 400 (additional target) |
|---|---|---|
| SoC | BCM2711, arm64 | BCM2711, arm64 (identical silicon) |
| DTB | `bcm2711-rpi-4-b.dtb` | `bcm2711-rpi-400.dtb` |
| Display | Official Raspberry Pi 7" Touchscreen V1.1 (DSI, 800×480, 10-point capacitive) | DSI 7" panel via Pi 400's DSI connector, **or** micro-HDMI to external 800×480/1024×600 touchscreen (USB-touch device) |
| Keyboard | External USB | Integrated keyboard |
| Power | GPIO 5V (USB-C reserved for peripheral OTG) | GPIO 5V (USB-C reserved for peripheral OTG) |
| USB peripheral | dwc3 via `dwc2,dr_mode=peripheral` overlay | dwc3 via `dwc2,dr_mode=peripheral` overlay (identical) |
Shared across both:
| | Value |
|---|---|
| Board | Raspberry Pi 4 Model B (BCM2711, arm64) |
| Display | Official Raspberry Pi 7" Touchscreen V1.1 (DSI, 800×480, 10-point capacitive) |
| Compositor | Openbox on X11 (xinit-launched) |
| Renderer left | Chromium kiosk consuming `common/`+`round/index.html` at (0,0)+480×480 |
| Renderer right | PySide6 (LGPL Qt for Python) QMainWindow at (480,0)+320×480 |
| IPC | WebSocket on `ws://127.0.0.1:9090/eye-square` hosted by the PySide6 process |
| Privileged ops | `secubox-eye-square-helper` FastAPI on Unix socket `/run/secubox/eye-square-helper.sock` |
| Power | GPIO 5V (USB-C reserved for peripheral-mode OTG) |
| USB peripheral | dwc3 in peripheral mode via the `dwc2,dr_mode=peripheral` overlay |
| Input | Touchscreen + USB touchpad + USB mouse + USB keyboard |
| Input | Touchscreen + USB touchpad + USB mouse + USB keyboard (Pi 400 adds integrated keyboard automatically via libinput) |
A single `secubox-eye-square_VERSION_arm64.img.xz` image boots on either board — the kernel's DTB selection at boot picks the right `bcm2711-rpi-*.dtb` based on the EEPROM model ID. `firstboot.sh` reads `/proc/device-tree/model` to record the board flavour and may set `hostname` accordingly (`secubox-eye-square-<6 hex>` on Pi 4B, `secubox-eye-square-400-<6 hex>` on Pi 400). All other configuration is identical.
### Out of scope (separate issues + specs)