AP Firmware sample usage guide:

Building

To build the AP Firmware for foo: cros build-ap -b foo

To build the AP Firmware only for foo-variant: cros build-ap -b foo --fw-name foo-variant

Flashing

Requires servod process to be running if flashing via servo

To flash your zork DUT with an IP of 1.1.1.1 via SSH: cros flash-ap -b zork -i /path/to/image.bin -d ssh://1.1.1.1

To flash your volteer DUT via SERVO on the default port (9999): cros flash-ap -d servo:port -b volteer -i /path/to/image.bin

To flash your volteer DUT via SERVO on port 1234: cros flash-ap -d servo:port:1234 -b volteer -i /path/to/image.bin

Add support for new board

Create ${BOARD}.py in chromite/lib/firmware/ap_firmware_config. The __template.py file can be copied into place, it contains a skeleton config.

Define the following variables:

BUILD_WORKON_PACKAGES as a list of all packages that should be cros_workon'd
  before building.

BUILD_PACKAGES as a list of all packages that should be emerged during the
  build process.

Define the following functions:

is_fast_required:
  Only required if it needs to return True for any cases!
  Returns true if --fast is necessary to flash successfully.

  Args:
    use_futility (bool): True if futility is to be used, False if
      flashrom.
    servo (str): The type name of the servo device being used.
  Returns:
    bool: True if fast is necessary, False otherwise.

get_commands:
  Get specific flash commands for this board
  Each board needs specific commands including the voltage for Vref, to turn
  on and turn off the SPI flash. These commands can be found in the care and
  feeding doc for your board, any command that needs to be run before
  flashing should be included in dut_control_on and anything run after flashing
  should be in dut_control_off.

  Args:
    servo (servo_lib.Servo): The servo connected to the target DUT.

  Returns:
    list: [dut_control_on, dut_control_off, flashrom_cmd, futility_cmd]
      dut_control*=2d arrays formmated like [["cmd1", "arg1", "arg2"],
                                             ["cmd2", "arg3", "arg4"]]
      where cmd1 will be run before cmd2
      flashrom_cmd=command to flash via flashrom
      futility_cmd=command to flash via futility

See dedede.py for examples of each function/variable.