111 lines
3.3 KiB
Markdown
111 lines
3.3 KiB
Markdown
# Debugging the EC firmware
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Terms used:
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- *target*: The laptop system that has the EC to be tested
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- *host*: The system that will have all devices connected to it and
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will receive the EC logs
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## Parallel port
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This method replaces the keyboard with a device used for debug logging.
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An alternate method of interacting with the target is needed; e.g., an
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external USB keyboard or SSH session.
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Requirements:
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- Arduino Mega 2560 compatible board
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- 24 pin FPC breakout board and cables
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- 0.5mm or 1.0mm pitch, depending on target connector
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- USB-C cable
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For details on configuring the Mega 2560 and breakout board, see
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[mega2560](./mega2560.md).
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### Setup
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1. Enable parallel port debugging in the EC firmware
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- Uncomment `PARALLEL_DEBUG` in `src/board/system76/common/common.mk`
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- Build and flash the firmware for the target
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2. Power off target
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3. Remove bottom panel
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4. Unplug keyboard cable
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- May require removing keyboard depending on port location
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5. Ground target to host
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- Connect USB cable from USB-C port on target to host
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6. Connect Mega 2560 to host
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- This will create an ACM device at `/dev/ttyACM*`
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7. Connect Mega 2560 to target
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8. Start the console
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```
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make BOARD=system76/<model> console_external
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```
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EC logs should now print to the console on the host. This can be tested
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by removing or inserting the AC adapter to trigger a power event.
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To return the Mega 2560 to host mode, reset the device.
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If logs are corrupted, try power cycling the Mega or reseating the cable.
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## I2C connection
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**Failure to follow steps in order, or performing steps on an
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unsupported board, may result in damaged board components.**
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### Wiring the target
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The I2C connection is made through the battery pins. Find the pins marked
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`SMC_BAT` (clock) and `SMD_BAT` (data) in the service manual.
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Board | `SMC_BAT` | `SMD_BAT`
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------------|-----------|-----------
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addw1 | 4 | 5
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addw2 | 4 | 5
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darp5 | 4 | 5
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darp6 | 4 | 5
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galp3 | 4 | 5
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galp3-b | 4 | 5
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galp3-c | 4 | 5
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galp4 | 4 | 5
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gaze14 | 4 | 3
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gaze15 | 4 | 3
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lemp9 | 6 | 5
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oryp5 | 4 | 5
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oryp6 | 6 | 5
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1. Power off system
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2. Unplug AC adapter
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3. Remove bottom panel
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4. Disconnect battery
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5. Attach one wire to `SMC_BAT`
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6. Attach one wire to `SMD_BAT`
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7. Route wires through the Kensington lock slot
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- Secure wires to board with tape
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8. Attach female connector and housing to wires
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9. Reconnect battery
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10. Replace bottom panel
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### Setup
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Requirements:
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- Target wired for EC debugging
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- Adafruit Trinket M0
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- USB-C cable
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1. Enable I2C debugging in the EC firmware for the target
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- Uncomment `I2C_DEBUGGER` in `src/board/system76/common/common.mk`
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- Build and flash firmware
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2. Connect Trinket M0 to host
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- This will create an ACM device at `/dev/ttyACM*`
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3. Connect to ACM device from host
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```
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sudo tio -b 115200 -m INLCRNL /dev/ttyACM0
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```
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4. Ground target to host
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- Connect USB cable from USB-C port on target to host
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5. Connect target to host
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- Connect `SMC_BAT` wire to `SCL` on Trinket M0
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- Connect `SMD_BAT` wire to `SDA` on Trinket M0
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EC logs should now print to the console on the host. This can be tested
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by removing or inserting the AC adapter to trigger a power event.
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