113 lines
3.3 KiB
Markdown
113 lines
3.3 KiB
Markdown
# Debugging the EC firmware
|
|
|
|
Terms used:
|
|
- *target*: The laptop system that has the EC to be tested
|
|
- *host*: The system that will have all devices connected to it and
|
|
will receive the EC logs
|
|
|
|
## Parallel port
|
|
|
|
This method replaces the keyboard with a device used for debug logging.
|
|
An alternate method of interacting with the target is needed; e.g., an
|
|
external USB keyboard or SSH session.
|
|
|
|
Requirements:
|
|
- Arduino Mega 2560 compatible board
|
|
- 24 pin flexible printed circuit
|
|
- 0.5mm or 1.0mm pitch, depending on target connector
|
|
- 24 pin FPC breakout board with connectors
|
|
- USB-C cable
|
|
|
|
### Configuring the Mega 2560
|
|
|
|
If the breakout board did not come preassembled, assemble it before
|
|
starting. This will require soldering.
|
|
|
|
1. Connect the breakout board to the Mega 2560
|
|
- Orientation will affect the mapping of GPIO pins
|
|
2. Connect the Mega 2560 to the host
|
|
3. Configure GPIO pin mapping in `parallel.c` based on how it will
|
|
connect to the target parallel port
|
|
- Trace pin 1 on motherboard connector to Mega's GPIO pins
|
|
4. Build and flash the firmware for the Mega 2560
|
|
```
|
|
make BOARD=arduino/mega2560
|
|
make BOARD=arduino/mega2560 flash
|
|
```
|
|
|
|
### Setup
|
|
|
|
1. Enable parallel port debugging in the EC firmware
|
|
- Uncomment `PARPORT_DEBUG` in `board.mk`
|
|
- Build and flash the firmware for the target
|
|
2. Power off target
|
|
3. Remove bottom panel
|
|
4. Unplug keyboard cable
|
|
- May require removing keyboard depending on port location
|
|
5. Connect Mega 2560 to host
|
|
- This will create an ACM device at `/dev/ttyACM*`
|
|
6. Ground target to host
|
|
- Connect USB cable from USB-C port on target to host
|
|
7. Connect Mega 2560 to target
|
|
8. Start the console
|
|
```
|
|
make BOARD=system76/<model> console_external
|
|
```
|
|
|
|
EC logs should now print to the console on the host. This can be tested
|
|
by removing or inserting the AC adapter to trigger a power event.
|
|
|
|
To return the Mega to host mode, reset the device.
|
|
|
|
If logs are corrupted, try power cycling the Mega or reseating the cable.
|
|
|
|
## I2C connection
|
|
|
|
**Failure to follow steps in order, or performing steps on an
|
|
unsupported board, may result in damaged board components.**
|
|
|
|
### Wiring the target
|
|
|
|
These steps apply to the following models:
|
|
- darp5
|
|
- darp6
|
|
- galp3-c
|
|
- galp4
|
|
|
|
1. Power off system
|
|
2. Unplug AC adapter
|
|
3. Remove bottom panel
|
|
4. Disconnect battery
|
|
5. Attach one wire to battery pin 4 (`CLK`)
|
|
6. Attach one wire to battery pin 5 (`DATA`)
|
|
7. Route wires through the Kensington lock slot
|
|
- Secure wires to board with tape
|
|
8. Attach female connector and housing to wires
|
|
9. Reconnect battery
|
|
10. Replace bottom panel
|
|
|
|
### Setup
|
|
|
|
Requirements:
|
|
- Target wired for EC debugging
|
|
- Adafruit Trinket M0
|
|
- USB-C cable
|
|
|
|
1. Enable I2C debugging in the EC firmware for the target
|
|
- Uncomment `I2C_DEBUGGER` in `board.mk`
|
|
- Build and flash firmware
|
|
2. Connect Trinket M0 to host
|
|
- This will create an ACM device at `/dev/ttyACM*`
|
|
3. Connect to ACM device from host
|
|
```
|
|
sudo tio -b 115200 -m INLCRNL /dev/ttyACM0
|
|
```
|
|
4. Ground target to host
|
|
- Connect USB cable from USB-C port on target to host
|
|
5. Connect target to host
|
|
- Connect `CLK` wire to `SCL` on Trinket M0
|
|
- Connect `DATA` wire to `SDA` on Trinket M0
|
|
|
|
EC logs should now print to the console on the host. This can be tested
|
|
by removing or inserting the AC adapter to trigger a power event.
|