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Add SIM7600 setup report: LTE over QMI, gpsd on stable port

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The L4T kernel ships without qmi_wwan/cdc-wdm, and PPP dial-up made KDDI
detach the povo SIM (attach APN was au's; PPP re-activating the default
bearer still detached). Built both modules out of tree from v5.15.148
into ~/infra/qmi_wwan, set the attach APN to povo.jp, and added an NM
connection at metric 1000 so LTE ranks below Ethernet and WiFi.

GNSS autostarts on the modem and gpsd reads /dev/sim7600-gps (udev
symlink on interface 01); no fix yet, tested indoors.

BOM: NMEA is on ttyUSB1 not ttyUSB3, and the data path is QMI, not
RNDIS/PPP.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
mikkeli
2026-10-08 01:36:27 +09:00
parent 007ce0bd8e
commit 4742d4a5bb
2 changed files with 151 additions and 5 deletions
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docs/BOM.md
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@@ -31,7 +31,7 @@ type: reference
| **Manufacturer** | Waveshare (SIMCom SIM7600G-H-M.2 module) |
| **Form factor** | M.2 B KEY |
| **Purpose** | LTE Cat 4 cellular + multi-constellation GNSS (GPS, Beidou, GLONASS, GALILEO, QZSS) |
| **Interface** | USB (ttyUSB* for AT commands/NMEA, usb0 for RNDIS Ethernet) |
| **Interface** | USB (ttyUSB* for AT commands/NMEA, QMI `cdc-wdm0` + `wwan0` for data) |
| **Power** | 3V – 4.2V (board rail) |
| **Antennas** | 3× IPEX (LTE main + LTE diversity + GNSS) |
| **Max data rate** | 150 Mbps DL / 50 Mbps UL (LTE Cat 4) |
@@ -41,14 +41,15 @@ type: reference
| Package | Purpose |
|---------|---------|
| `gpsd` | Decode NMEA from the GNSS ttyUSB port |
| `ModemManager` + `NetworkManager` | Manage the modem and the LTE data connection (QMI) |
| `qmi_wwan` + `cdc-wdm` kernel modules | Not in the Tegra kernel; built out of tree in `~/infra/qmi_wwan/` |
| `minicom` (or `picocom`) | AT command terminal for module configuration |
| `dhclient` / `NetworkManager` | Bring up the RNDIS network interface (`usb0`) |
| `ppp` (optional) | If dial-up (ATD*99#) is preferred over RNDIS |
### Notes
- The module presents multiple USB serial ports (`/dev/ttyUSB0`–`/dev/ttyUSB4`) — typically ttyUSB2 for AT commands, ttyUSB3 for NMEA GPS data.
- USB PID switching (`AT+CUSBPIDSWITCH=9011,1,1`) may be needed to expose the RNDIS network interface.
- The module presents multiple USB serial ports (`/dev/ttyUSB0`–`/dev/ttyUSB4`) — ttyUSB2/3 for AT commands, ttyUSB1 for NMEA GPS data (symlinked as `/dev/sim7600-gps`).
- Default USB composition (PID 9001) is used with QMI; no PID switch needed. PPP dial-up does not work with the povo SIM (network detaches).
- Setup details: [SIM7600 setup report](impl/reports/SIM7600-SETUP.md).
- M.2 B KEY is **not** mechanically compatible with Mini-PCIe.
- Supply voltage should be ~4.0 V for reliable operation.
- DO NOT hot-plug while powered.