1 # Copyright (c) 2015 Stephen Warren
2 # Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
4 # SPDX-License-Identifier: GPL-2.0
6 # Common logic to interact with U-Boot via the console. This class provides
7 # the interface that tests use to execute U-Boot shell commands and wait for
8 # their results. Sub-classes exist to perform board-type-specific setup
9 # operations, such as spawning a sub-process for Sandbox, or attaching to the
10 # serial console of real hardware.
12 import multiplexed_log
19 # Regexes for text we expect U-Boot to send to the console.
20 pattern_u_boot_spl_signon = re.compile('(U-Boot SPL \\d{4}\\.\\d{2}-[^\r\n]*)')
21 pattern_u_boot_main_signon = re.compile('(U-Boot \\d{4}\\.\\d{2}-[^\r\n]*)')
22 pattern_stop_autoboot_prompt = re.compile('Hit any key to stop autoboot: ')
23 pattern_unknown_command = re.compile('Unknown command \'.*\' - try \'help\'')
24 pattern_error_notification = re.compile('## Error: ')
26 class ConsoleDisableCheck(object):
27 '''Context manager (for Python's with statement) that temporarily disables
28 the specified console output error check. This is useful when deliberately
29 executing a command that is known to trigger one of the error checks, in
30 order to test that the error condition is actually raised. This class is
31 used internally by ConsoleBase::disable_check(); it is not intended for
34 def __init__(self, console, check_type):
35 self.console = console
36 self.check_type = check_type
39 self.console.disable_check_count[self.check_type] += 1
41 def __exit__(self, extype, value, traceback):
42 self.console.disable_check_count[self.check_type] -= 1
44 class ConsoleBase(object):
45 '''The interface through which test functions interact with the U-Boot
46 console. This primarily involves executing shell commands, capturing their
47 results, and checking for common error conditions. Some common utilities
48 are also provided too.'''
50 def __init__(self, log, config, max_fifo_fill):
51 '''Initialize a U-Boot console connection.
53 Can only usefully be called by sub-classes.
56 log: A mulptiplex_log.Logfile object, to which the U-Boot output
58 config: A configuration data structure, as built by conftest.py.
59 max_fifo_fill: The maximum number of characters to send to U-Boot
60 command-line before waiting for U-Boot to echo the characters
61 back. For UART-based HW without HW flow control, this value
62 should be set less than the UART RX FIFO size to avoid
63 overflow, assuming that U-Boot can't keep up with full-rate
64 traffic at the baud rate.
72 self.max_fifo_fill = max_fifo_fill
74 self.logstream = self.log.get_stream('console', sys.stdout)
76 # Array slice removes leading/trailing quotes
77 self.prompt = self.config.buildconfig['config_sys_prompt'][1:-1]
78 self.prompt_escaped = re.escape(self.prompt)
80 self.disable_check_count = {
84 'error_notification': 0,
87 self.at_prompt = False
88 self.at_prompt_logevt = None
92 '''Terminate the connection to the U-Boot console.
94 This function is only useful once all interaction with U-Boot is
95 complete. Once this function is called, data cannot be sent to or
107 self.logstream.close()
109 def run_command(self, cmd, wait_for_echo=True, send_nl=True,
110 wait_for_prompt=True):
111 '''Execute a command via the U-Boot console.
113 The command is always sent to U-Boot.
115 U-Boot echoes any command back to its output, and this function
116 typically waits for that to occur. The wait can be disabled by setting
117 wait_for_echo=False, which is useful e.g. when sending CTRL-C to
118 interrupt a long-running command such as "ums".
120 Command execution is typically triggered by sending a newline
121 character. This can be disabled by setting send_nl=False, which is
122 also useful when sending CTRL-C.
124 This function typically waits for the command to finish executing, and
125 returns the console output that it generated. This can be disabled by
126 setting wait_for_prompt=False, which is useful when invoking a long-
127 running command such as "ums".
130 cmd: The command to send.
131 wait_for_each: Boolean indicating whether to wait for U-Boot to
132 echo the command text back to its output.
133 send_nl: Boolean indicating whether to send a newline character
134 after the command string.
135 wait_for_prompt: Boolean indicating whether to wait for the
136 command prompt to be sent by U-Boot. This typically occurs
137 immediately after the command has been executed.
140 If wait_for_prompt == False:
143 The output from U-Boot during command execution. In other
144 words, the text U-Boot emitted between the point it echod the
145 command string and emitted the subsequent command prompts.
148 if self.at_prompt and \
149 self.at_prompt_logevt != self.logstream.logfile.cur_evt:
150 self.logstream.write(self.prompt, implicit=True)
154 if (self.disable_check_count['spl_signon'] == 0 and
155 self.u_boot_spl_signon):
156 bad_patterns.append(self.u_boot_spl_signon_escaped)
157 bad_pattern_ids.append('SPL signon')
158 if self.disable_check_count['main_signon'] == 0:
159 bad_patterns.append(self.u_boot_main_signon_escaped)
160 bad_pattern_ids.append('U-Boot main signon')
161 if self.disable_check_count['unknown_command'] == 0:
162 bad_patterns.append(pattern_unknown_command)
163 bad_pattern_ids.append('Unknown command')
164 if self.disable_check_count['error_notification'] == 0:
165 bad_patterns.append(pattern_error_notification)
166 bad_pattern_ids.append('Error notification')
168 self.at_prompt = False
172 # Limit max outstanding data, so UART FIFOs don't overflow
173 chunk = cmd[:self.max_fifo_fill]
174 cmd = cmd[self.max_fifo_fill:]
176 if not wait_for_echo:
178 chunk = re.escape(chunk)
179 chunk = chunk.replace('\\\n', '[\r\n]')
180 m = self.p.expect([chunk] + bad_patterns)
182 self.at_prompt = False
183 raise Exception('Bad pattern found on console: ' +
184 bad_pattern_ids[m - 1])
185 if not wait_for_prompt:
187 m = self.p.expect([self.prompt_escaped] + bad_patterns)
189 self.at_prompt = False
190 raise Exception('Bad pattern found on console: ' +
191 bad_pattern_ids[m - 1])
192 self.at_prompt = True
193 self.at_prompt_logevt = self.logstream.logfile.cur_evt
194 # Only strip \r\n; space/TAB might be significant if testing
196 return self.p.before.strip('\r\n')
197 except Exception as ex:
198 self.log.error(str(ex))
203 '''Send a CTRL-C character to U-Boot.
205 This is useful in order to stop execution of long-running synchronous
206 commands such as "ums".
215 self.run_command(chr(3), wait_for_echo=False, send_nl=False)
217 def drain_console(self):
218 '''Read from and log the U-Boot console for a short time.
220 U-Boot's console output is only logged when the test code actively
221 waits for U-Boot to emit specific data. There are cases where tests
222 can fail without doing this. For example, if a test asks U-Boot to
223 enable USB device mode, then polls until a host-side device node
224 exists. In such a case, it is useful to log U-Boot's console output
225 in case U-Boot printed clues as to why the host-side even did not
226 occur. This function will do that.
235 # If we are already not connected to U-Boot, there's nothing to drain.
236 # This should only happen when a previous call to run_command() or
237 # wait_for() failed (and hence the output has already been logged), or
238 # the system is shutting down.
242 orig_timeout = self.p.timeout
244 # Drain the log for a relatively short time.
245 self.p.timeout = 1000
246 # Wait for something U-Boot will likely never send. This will
247 # cause the console output to be read and logged.
248 self.p.expect(['This should never match U-Boot output'])
249 except u_boot_spawn.Timeout:
252 self.p.timeout = orig_timeout
254 def ensure_spawned(self):
255 '''Ensure a connection to a correctly running U-Boot instance.
257 This may require spawning a new Sandbox process or resetting target
258 hardware, as defined by the implementation sub-class.
260 This is an internal function and should not be called directly.
272 self.at_prompt = False
273 self.log.action('Starting U-Boot')
274 self.p = self.get_spawn()
275 # Real targets can take a long time to scroll large amounts of
276 # text if LCD is enabled. This value may need tweaking in the
277 # future, possibly per-test to be optimal. This works for 'help'
278 # on board 'seaboard'.
279 self.p.timeout = 30000
280 self.p.logfile_read = self.logstream
281 if self.config.buildconfig.get('CONFIG_SPL', False) == 'y':
282 self.p.expect([pattern_u_boot_spl_signon])
283 self.u_boot_spl_signon = self.p.after
284 self.u_boot_spl_signon_escaped = re.escape(self.p.after)
286 self.u_boot_spl_signon = None
287 self.p.expect([pattern_u_boot_main_signon])
288 self.u_boot_main_signon = self.p.after
289 self.u_boot_main_signon_escaped = re.escape(self.p.after)
290 build_idx = self.u_boot_main_signon.find(', Build:')
292 self.u_boot_version_string = self.u_boot_main_signon
294 self.u_boot_version_string = self.u_boot_main_signon[:build_idx]
296 match = self.p.expect([self.prompt_escaped,
297 pattern_stop_autoboot_prompt])
299 self.p.send(chr(3)) # CTRL-C
302 self.at_prompt = True
303 self.at_prompt_logevt = self.logstream.logfile.cur_evt
304 except Exception as ex:
305 self.log.error(str(ex))
309 def cleanup_spawn(self):
310 '''Shut down all interaction with the U-Boot instance.
312 This is used when an error is detected prior to re-establishing a
313 connection with a fresh U-Boot instance.
315 This is an internal function and should not be called directly.
331 def validate_version_string_in_text(self, text):
332 '''Assert that a command's output includes the U-Boot signon message.
334 This is primarily useful for validating the "version" command without
335 duplicating the signon text regex in a test function.
338 text: The command output text to check.
341 Nothing. An exception is raised if the validation fails.
344 assert(self.u_boot_version_string in text)
346 def disable_check(self, check_type):
347 '''Temporarily disable an error check of U-Boot's output.
349 Create a new context manager (for use with the "with" statement) which
350 temporarily disables a particular console output error check.
353 check_type: The type of error-check to disable. Valid values may
354 be found in self.disable_check_count above.
357 A context manager object.
360 return ConsoleDisableCheck(self, check_type)
362 def find_ram_base(self):
363 '''Find the running U-Boot's RAM location.
365 Probe the running U-Boot to determine the address of the first bank
366 of RAM. This is useful for tests that test reading/writing RAM, or
367 load/save files that aren't associated with some standard address
368 typically represented in an environment variable such as
369 ${kernel_addr_r}. The value is cached so that it only needs to be
376 The address of U-Boot's first RAM bank, as an integer.
379 if self.config.buildconfig.get('config_cmd_bdi', 'n') != 'y':
380 pytest.skip('bdinfo command not supported')
381 if self.ram_base == -1:
382 pytest.skip('Previously failed to find RAM bank start')
383 if self.ram_base is not None:
386 with self.log.section('find_ram_base'):
387 response = self.run_command('bdinfo')
388 for l in response.split('\n'):
390 self.ram_base = int(l.split('=')[1].strip(), 16)
392 if self.ram_base is None:
394 raise Exception('Failed to find RAM bank start in `bdinfo`')