151 خطوط
6.8 KiB
Python
151 خطوط
6.8 KiB
Python
"""Check an existing U-Boot prompt or configure its volatile environment."""
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import argparse
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import fcntl
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import re
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import sys
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import time
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from pathlib import Path
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import serial
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# Match the complete final line, never a prompt embedded in command output.
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PROMPT = re.compile(r"(?:^|\n)([^\r\n]*=>) ?$")
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ERROR = re.compile(
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r"Unknown command|## Error|^Error:|^Usage:|^.*(?:not defined|not found|failed|failure).*$",
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re.IGNORECASE | re.MULTILINE
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)
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class UBoot:
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def __init__(self, port):
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self.port = port
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self.prompt = None
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def read_prompt(self, timeout):
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output = ""
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deadline = time.monotonic() + timeout
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while time.monotonic() < deadline:
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data = self.port.read(self.port.in_waiting or 1)
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if data:
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chunk = data.decode("utf-8", errors="replace").replace("\r", "")
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print(chunk, end="", flush=True)
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output += chunk
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match = PROMPT.search(output)
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if match and (self.prompt is None or match[1] == self.prompt):
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# Wait for a quiet prompt rather than a partial output line.
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time.sleep(0.15)
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if self.port.in_waiting:
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continue
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return output, match[1]
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raise RuntimeError("Timed out waiting for the CLI prompt")
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def detect(self):
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# Observe before requesting a fresh prompt.
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try:
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_, candidate = self.read_prompt(3)
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except RuntimeError:
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candidate = None
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if candidate is None:
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# An idle prompt may have been printed before the port was opened.
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# A newline only requests a fresh prompt; no U-Boot command is sent.
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self.port.write(b"\r")
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self.port.flush()
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_, candidate = self.read_prompt(5)
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if not candidate.endswith("=>"):
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raise RuntimeError("Response is not a recognized U-Boot CLI prompt")
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self.prompt = candidate
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print("\nU-Boot-style CLI prompt detected: " + candidate, flush=True)
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def command(self, command, expected=None, timeout=10, allow_missing=()):
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print("\n>>> " + command, flush=True)
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self.port.write((command + "\r").encode())
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self.port.flush()
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output, _ = self.read_prompt(timeout)
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# Query immediately, before another command changes the return status.
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self.port.write(b"echo __UBOOT_STATUS_ $?\r")
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self.port.flush()
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status, _ = self.read_prompt(5)
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codes = re.findall(r"(?m)^__UBOOT_STATUS_ (\d+) *$", status)
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# Only the initial environment inspection may report unset variables.
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missing_pattern = r'^## Error: "(' + "|".join(map(re.escape, allow_missing)) + r')" not defined$'
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missing = re.findall(missing_pattern, output, re.MULTILINE) if allow_missing else []
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checked_output = re.sub(missing_pattern, "", output, flags=re.MULTILINE) if missing else output
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if codes != ["0"] and not (codes == ["1"] and missing):
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raise RuntimeError("Command failed or its exit status could not be verified: " + command)
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if ERROR.search(checked_output):
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raise RuntimeError("Error in command response: " + command)
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if expected and not re.search(expected, output, re.MULTILINE):
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raise RuntimeError("Expected response missing: " + command)
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if missing:
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print("\nInitially unset: " + ", ".join(missing), flush=True)
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print("\nVerified: " + command, flush=True)
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return output
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def transfer(cli, firmware):
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image = firmware.read_bytes()
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if not 32 <= len(image) <= 0x02000000:
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raise RuntimeError("Firmware must contain at least 32 bytes and fit RAM at 0x42000000")
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output = cli.command(
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"tftp 0x42000000 u-boot-sunxi-with-spl.bin",
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r"^Bytes transferred = \d+", timeout=120,
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)
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transferred = re.findall(r"^Bytes transferred = (\d+)", output, re.MULTILINE)
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if transferred != [str(len(image))]:
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raise RuntimeError("TFTP byte count differs from the local firmware file")
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output = cli.command("echo ${filesize}", r"^[0-9a-fA-F]+$")
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sizes = re.findall(r"^([0-9a-fA-F]+)$", output, re.MULTILINE)
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if len(sizes) != 1 or int(sizes[0], 16) != len(image):
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raise RuntimeError("U-Boot filesize differs from the local firmware file")
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output = cli.command("md.b 0x42000000 0x20", r"^42000000:")
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dumped = bytearray()
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for address in ("42000000", "42000010"):
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rows = re.findall(r"^" + address + r":((?: [0-9a-fA-F]{2}){16})(?:\s|$)", output, re.MULTILINE)
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if len(rows) != 1:
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raise RuntimeError("Missing or invalid memory dump at " + address)
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dumped.extend(bytes.fromhex(rows[0]))
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if dumped != image[:32]:
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raise RuntimeError("First 32 bytes in RAM differ from the local firmware file")
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print("\nTransfer verified: size and first 32 bytes match; no flash write performed.")
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument("mode", choices=("check", "configure", "transfer"), default="check", nargs="?")
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parser.add_argument("--port", default="/dev/ttyUSB0")
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parser.add_argument("--firmware", type=Path, default=Path(__file__).resolve().parent.parent / "firmware" / "u-boot-sunxi-with-spl.bin")
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args = parser.parse_args()
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if args.mode == "transfer" and not args.firmware.is_file():
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raise RuntimeError("Firmware file not found: " + str(args.firmware))
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# Shared by both workflows: fail rather than interleave serial commands.
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with open("/tmp/uboot-serial.lock", "w") as lock:
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fcntl.flock(lock, fcntl.LOCK_EX | fcntl.LOCK_NB)
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with serial.Serial(args.port, 115200, timeout=0.1, write_timeout=2, exclusive=True) as port:
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cli = UBoot(port)
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cli.detect()
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if args.mode == "check":
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return
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if args.mode == "transfer":
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transfer(cli, args.firmware)
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return
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cli.command("version", r"^U-Boot \d")
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cli.command(
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"printenv ipaddr serverip ethaddr bootcmd bootargs",
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allow_missing=("ipaddr", "serverip", "ethaddr", "bootcmd", "bootargs"),
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)
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cli.command("setenv ipaddr 192.168.75.100")
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cli.command("printenv ipaddr", r"^ipaddr=192\.168\.75\.100$")
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cli.command("setenv serverip 192.168.75.247")
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cli.command("printenv serverip", r"^serverip=192\.168\.75\.247$")
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cli.command("ping 192.168.75.247", r"^host 192\.168\.75\.247 is alive$", timeout=30)
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cli.command("sf probe 0:0", r"^SF: Detected .+", timeout=20)
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print("\nAll commands verified; environment changes were not saved to flash.")
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if __name__ == "__main__":
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try:
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main()
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except (RuntimeError, OSError, serial.SerialException) as exc:
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print("\nERROR: " + str(exc), file=sys.stderr)
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sys.exit(1)
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