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# Copyright (c) 2015 Stephen Warren
# Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
#
# SPDX-License-Identifier: GPL-2.0
# Logic to interact with U-Boot running on real hardware, typically via a
# physical serial port.
import sys
from u_boot_spawn import Spawn
from u_boot_console_base import ConsoleBase
class ConsoleExecAttach(ConsoleBase):
"""Represents a physical connection to a U-Boot console, typically via a
serial port. This implementation executes a sub-process to attach to the
console, expecting that the stdin/out of the sub-process will be forwarded
to/from the physical hardware. This approach isolates the test infra-
structure from the user-/installation-specific details of how to
communicate with, and the identity of, serial ports etc."""
def __init__(self, log, config):
"""Initialize a U-Boot console connection.
Args:
log: A multiplexed_log.Logfile instance.
config: A "configuration" object as defined in conftest.py.
Returns:
Nothing.
"""
# The max_fifo_fill value might need tweaking per-board/-SoC?
# 1 would be safe anywhere, but is very slow (a pexpect issue?).
# 16 is a common FIFO size.
# HW flow control would mean this could be infinite.
super(ConsoleExecAttach, self).__init__(log, config, max_fifo_fill=16)
self.log.action('Flashing U-Boot')
cmd = ['u-boot-test-flash', config.board_type, config.board_identity]
runner = self.log.get_runner(cmd[0], sys.stdout)
runner.run(cmd)
runner.close()
def get_spawn(self):
"""Connect to a fresh U-Boot instance.
The target board is reset, so that U-Boot begins running from scratch.
Args:
None.
Returns:
A u_boot_spawn.Spawn object that is attached to U-Boot.
"""
args = [self.config.board_type, self.config.board_identity]
s = Spawn(['u-boot-test-console'] + args)
self.log.action('Resetting board')
cmd = ['u-boot-test-reset'] + args
runner = self.log.get_runner(cmd[0], sys.stdout)
runner.run(cmd)
runner.close()
return s
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