Sergei Trofimov | 4e6afe9 | 2015-10-09 09:30:04 +0100 | [diff] [blame] | 1 | # |
| 2 | # Copyright 2015 ARM Limited |
| 3 | # |
| 4 | # Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | # you may not use this file except in compliance with the License. |
| 6 | # You may obtain a copy of the License at |
| 7 | # |
| 8 | # http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | # |
| 10 | # Unless required by applicable law or agreed to in writing, software |
| 11 | # distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | # See the License for the specific language governing permissions and |
| 14 | # limitations under the License. |
| 15 | # |
| 16 | import re |
| 17 | import time |
| 18 | import logging |
| 19 | |
| 20 | from devlib.utils.serial_port import TIMEOUT |
| 21 | |
| 22 | |
| 23 | logger = logging.getLogger('U-Boot') |
| 24 | |
| 25 | |
| 26 | class UbootMenu(object): |
| 27 | """ |
| 28 | Allows navigating Das U-boot menu over serial (it relies on a pexpect connection). |
| 29 | |
| 30 | """ |
| 31 | |
| 32 | option_regex = re.compile(r'^\[(\d+)\]\s+([^\r]+)\r\n', re.M) |
| 33 | prompt_regex = re.compile(r'^([^\r\n]+):\s*', re.M) |
| 34 | invalid_regex = re.compile(r'Invalid input \(max (\d+)\)', re.M) |
| 35 | |
| 36 | load_delay = 1 # seconds |
| 37 | default_timeout = 60 # seconds |
| 38 | |
| 39 | def __init__(self, conn, start_prompt='Hit any key to stop autoboot'): |
| 40 | """ |
| 41 | :param conn: A serial connection as returned by ``pexect.spawn()``. |
| 42 | :param prompt: U-Boot menu prompt |
| 43 | :param start_prompt: The starting prompt to wait for during ``open()``. |
| 44 | |
| 45 | """ |
| 46 | self.conn = conn |
| 47 | self.conn.crlf = '\n\r' # TODO: this has *got* to be a bug in U-Boot... |
| 48 | self.start_prompt = start_prompt |
| 49 | self.options = {} |
| 50 | self.prompt = None |
| 51 | |
| 52 | def open(self, timeout=default_timeout): |
| 53 | """ |
| 54 | "Open" the UEFI menu by sending an interrupt on STDIN after seeing the |
| 55 | starting prompt (configurable upon creation of the ``UefiMenu`` object. |
| 56 | |
| 57 | """ |
| 58 | self.conn.expect(self.start_prompt, timeout) |
| 59 | self.conn.sendline('') |
| 60 | time.sleep(self.load_delay) |
| 61 | self.conn.readline() # garbage |
| 62 | self.conn.sendline('') |
| 63 | self.prompt = self.conn.readline().strip() |
| 64 | |
| 65 | def getenv(self): |
| 66 | output = self.enter('printenv') |
| 67 | result = {} |
| 68 | for line in output.split('\n'): |
| 69 | if '=' in line: |
| 70 | variable, value = line.split('=', 1) |
| 71 | result[variable.strip()] = value.strip() |
| 72 | return result |
| 73 | |
| 74 | def setenv(self, variable, value, force=False): |
| 75 | force_str = ' -f' if force else '' |
| 76 | if value is not None: |
| 77 | command = 'setenv{} {} {}'.format(force_str, variable, value) |
| 78 | else: |
| 79 | command = 'setenv{} {}'.format(force_str, variable) |
| 80 | return self.enter(command) |
| 81 | |
| 82 | def boot(self): |
| 83 | self.write_characters('boot') |
| 84 | |
| 85 | def nudge(self): |
| 86 | """Send a little nudge to ensure there is something to read. This is useful when you're not |
| 87 | sure if all out put from the serial has been read already.""" |
| 88 | self.enter('') |
| 89 | |
| 90 | def enter(self, value, delay=load_delay): |
| 91 | """Like ``select()`` except no resolution is performed -- the value is sent directly |
| 92 | to the serial connection.""" |
| 93 | # Empty the buffer first, so that only response to the input about to |
| 94 | # be sent will be processed by subsequent commands. |
| 95 | value = str(value) |
| 96 | self.empty_buffer() |
| 97 | self.write_characters(value) |
| 98 | self.conn.expect(self.prompt, timeout=delay) |
| 99 | return self.conn.before |
| 100 | |
| 101 | def write_characters(self, line): |
| 102 | line = line.rstrip('\r\n') |
| 103 | for c in line: |
| 104 | self.conn.send(c) |
| 105 | time.sleep(0.05) |
| 106 | self.conn.sendline('') |
| 107 | |
| 108 | def empty_buffer(self): |
| 109 | try: |
| 110 | while True: |
| 111 | time.sleep(0.1) |
| 112 | self.conn.read_nonblocking(size=1024, timeout=0.1) |
| 113 | except TIMEOUT: |
| 114 | pass |
| 115 | self.conn.buffer = '' |
| 116 | |