117 lines
3.3 KiB
Markdown
117 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 flexible printed circuit
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- 0.5mm or 1.0mm pitch, depending on target connector
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- 24 pin FPC breakout board with connectors
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- USB-C cable
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### Configuring the Mega 2560
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If the breakout board did not come preassembled, assemble it before
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starting. This will require soldering.
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1. Connect the breakout board to the Mega 2560
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- Orientation will affect the mapping of GPIO pins
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2. Connect the Mega 2560 to the host
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3. Configure GPIO pin mapping in `parallel.c` based on how it will
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connect to the target parallel port
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- Trace pin 1 on motherboard connector to Mega's GPIO pins
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4. Build and flash the firmware for the Mega 2560
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```
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make BOARD=arduino/mega2560
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make BOARD=arduino/mega2560 flash
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```
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### Setup
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1. Enable parallel port debugging in the EC firmware
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- Uncomment `PARPORT_DEBUG` in `board.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. Connect Mega 2560 to host
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- This will create an ACM device at `/dev/ttyACM*`
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6. Connect to ACM device from host
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```
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sudo tio -b 1000000 -m INLCRNL /dev/ttyACM0
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```
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7. Set Mega to peripheral mode
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```
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echo 'C' > /dev/ttyACM0
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```
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8. Ground target to host
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- Connect USB cable from USB-C port on target to host
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9. Connect Mega 2560 to target
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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 to host mode, reset the device.
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If logs are corrupted, try power cycling the Mega.
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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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These steps apply to the following models:
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- darp5
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- darp6
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- galp3-c
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- galp4
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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 battery pin 4 (`CLK`)
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6. Attach one wire to battery pin 5 (`DATA`)
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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 `board.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 `CLK` wire to `SCL` on Trinket M0
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- Connect `DATA` 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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