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e8debf394f
Python's coding style docs indicate to use " not ' for docstrings. test/py has other violations of the coding style docs, since the docs specify a stranger style than I would expect, but nobody has complained about those yet:-) Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org>
66 lines
2.2 KiB
Python
66 lines
2.2 KiB
Python
# Copyright (c) 2015 Stephen Warren
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# Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
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#
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# SPDX-License-Identifier: GPL-2.0
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# Logic to interact with U-Boot running on real hardware, typically via a
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# physical serial port.
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import sys
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from u_boot_spawn import Spawn
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from u_boot_console_base import ConsoleBase
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class ConsoleExecAttach(ConsoleBase):
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"""Represents a physical connection to a U-Boot console, typically via a
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serial port. This implementation executes a sub-process to attach to the
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console, expecting that the stdin/out of the sub-process will be forwarded
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to/from the physical hardware. This approach isolates the test infra-
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structure from the user-/installation-specific details of how to
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communicate with, and the identity of, serial ports etc."""
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def __init__(self, log, config):
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"""Initialize a U-Boot console connection.
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Args:
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log: A multiplexed_log.Logfile instance.
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config: A "configuration" object as defined in conftest.py.
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Returns:
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Nothing.
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"""
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# The max_fifo_fill value might need tweaking per-board/-SoC?
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# 1 would be safe anywhere, but is very slow (a pexpect issue?).
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# 16 is a common FIFO size.
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# HW flow control would mean this could be infinite.
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super(ConsoleExecAttach, self).__init__(log, config, max_fifo_fill=16)
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self.log.action('Flashing U-Boot')
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cmd = ['u-boot-test-flash', config.board_type, config.board_identity]
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runner = self.log.get_runner(cmd[0], sys.stdout)
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runner.run(cmd)
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runner.close()
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def get_spawn(self):
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"""Connect to a fresh U-Boot instance.
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The target board is reset, so that U-Boot begins running from scratch.
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Args:
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None.
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Returns:
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A u_boot_spawn.Spawn object that is attached to U-Boot.
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"""
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args = [self.config.board_type, self.config.board_identity]
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s = Spawn(['u-boot-test-console'] + args)
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self.log.action('Resetting board')
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cmd = ['u-boot-test-reset'] + args
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runner = self.log.get_runner(cmd[0], sys.stdout)
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runner.run(cmd)
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runner.close()
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return s
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