Robin Mueller
896fdb839f
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280 lines
10 KiB
Python
Executable File
280 lines
10 KiB
Python
Executable File
#!/usr/bin/env python3
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from spacepackets.ecss.defs import PusService
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import toml
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import struct
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import logging
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import argparse
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import time
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import enum
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from tmtccmd.com.serial_base import SerialCfg
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from tmtccmd.com.serial_cobs import SerialCobsComIF
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from tmtccmd.com.ser_utils import prompt_com_port
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from crcmod.predefined import PredefinedCrc
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from spacepackets.ecss.tc import PusTc
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from pathlib import Path
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import dataclasses
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from elftools.elf.elffile import ELFFile
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BAUD_RATE = 115200
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BOOTLOADER_START_ADDR = 0x0
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BOOTLOADER_END_ADDR = 0x4000
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BOOTLOADER_CRC_ADDR = 0x3FFC
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APP_A_START_ADDR = 0x4000
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APP_A_END_ADDR = 0x22000
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# The actual size of the image which is relevant for CRC calculation.
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APP_A_SIZE_ADDR = 0x21FF8
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APP_A_CRC_ADDR = 0x21FFC
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APP_B_START_ADDR = 0x22000
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APP_B_END_ADDR = 0x40000
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# The actual size of the image which is relevant for CRC calculation.
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APP_B_SIZE_ADDR = 0x3FFF8
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APP_B_CRC_ADDR = 0x3FFFC
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APP_IMG_SZ = 0x1E000
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CHUNK_SIZE = 896
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MEMORY_SERVICE = 6
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ACTION_SERVICE = 8
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RAW_MEMORY_WRITE_SUBSERVICE = 2
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BOOT_NVM_MEMORY_ID = 1
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class ActionId(enum.IntEnum):
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CORRUPT_APP_A = 128
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CORRUPT_APP_B = 129
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_LOGGER = logging.getLogger(__name__)
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@dataclasses.dataclass
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class LoadableSegment:
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name: str
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offset: int
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size: int
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data: bytes
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def main() -> int:
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print("Python VA416XX Image Loader Application")
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logging.basicConfig(
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format="[%(asctime)s] [%(levelname)s] %(message)s", level=logging.DEBUG
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)
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parser = argparse.ArgumentParser(
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prog="image-loader", description="Python VA416XX Image Loader Application"
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)
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parser.add_argument("-p", "--ping", action="store_true", help="Send ping command")
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parser.add_argument("-c", "--corrupt", action="store_true", help="Corrupt a target")
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parser.add_argument(
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"-t",
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"--target",
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choices=["bl", "a", "b"],
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help="Target (Bootloader or slot A or B)",
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)
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parser.add_argument(
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"path", nargs="?", default=None, help="Path to the App to flash"
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)
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args = parser.parse_args()
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serial_port = None
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if Path("loader.toml").exists():
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with open("loader.toml", "r") as toml_file:
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parsed_toml = toml.loads(toml_file.read())
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if "serial_port" in parsed_toml:
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serial_port = parsed_toml["serial_port"]
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if serial_port is None:
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serial_port = prompt_com_port()
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serial_cfg = SerialCfg(
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com_if_id="ser_cobs",
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serial_port=serial_port,
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baud_rate=BAUD_RATE,
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serial_timeout=0.1,
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)
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com_if = SerialCobsComIF(serial_cfg)
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com_if.open()
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file_path = None
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if args.target:
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if not args.corrupt:
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if not args.path:
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_LOGGER.error("App Path needs to be specified for the flash process")
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return -1
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file_path = Path(args.path)
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if not file_path.exists():
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_LOGGER.error("File does not exist")
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return -1
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if args.ping:
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_LOGGER.info("Sending ping command")
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ping_tc = PusTc(apid=0x00, service=PusService.S17_TEST, subservice=1)
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com_if.send(ping_tc.pack())
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if args.corrupt:
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if not args.target:
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_LOGGER.error("target for corruption command required")
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return -1
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if args.target == "bl":
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_LOGGER.error("can not corrupt bootloader")
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if args.target == "a":
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packet = PusTc(
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apid=0,
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service=ACTION_SERVICE,
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subservice=ActionId.CORRUPT_APP_A,
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)
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com_if.send(packet.pack())
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if args.target == "b":
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packet = PusTc(
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apid=0,
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service=ACTION_SERVICE,
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subservice=ActionId.CORRUPT_APP_B,
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)
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com_if.send(packet.pack())
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else:
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assert file_path is not None
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loadable_segments = []
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_LOGGER.info("Parsing ELF file for loadable sections")
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total_size = 0
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with open(file_path, "rb") as app_file:
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elf_file = ELFFile(app_file)
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for (idx, segment) in enumerate(elf_file.iter_segments("PT_LOAD")):
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if segment.header.p_filesz == 0:
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continue
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# Basic validity checks of the base addresses.
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if idx == 0:
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if (
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args.target == "bl"
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and segment.header.p_paddr != BOOTLOADER_START_ADDR
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):
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raise ValueError(
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f"detected possibly invalid start address {segment.header.p_paddr:#08x} for "
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f"bootloader, expected {BOOTLOADER_START_ADDR}"
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)
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if args.target == "a" and segment.header.p_paddr != APP_A_START_ADDR:
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raise ValueError(
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f"detected possibly invalid start address {segment.header.p_paddr:#08x} for "
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f"App A, expected {APP_A_START_ADDR}"
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)
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if args.target == "b" and segment.header.p_paddr != APP_B_START_ADDR:
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raise ValueError(
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f"detected possibly invalid start address {segment.header.p_paddr:#08x} for "
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f"App B, expected {APP_B_START_ADDR}"
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)
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name = None
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for section in elf_file.iter_sections():
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if (
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section.header.sh_offset == segment.header.p_offset
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and section.header.sh_size > 0
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):
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name = section.name
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if name is None:
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_LOGGER.warning("no fitting section found for segment")
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continue
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# print(f"Segment Addr: {segment.header.p_paddr}")
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# print(f"Segment Offset: {segment.header.p_offset}")
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# print(f"Segment Filesize: {segment.header.p_filesz}")
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loadable_segments.append(
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LoadableSegment(
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name=name,
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offset=segment.header.p_paddr,
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size=segment.header.p_filesz,
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data=segment.data(),
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)
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)
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total_size += segment.header.p_filesz
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context_str = None
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if args.target == "bl":
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context_str = "Bootloader"
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elif args.target == "a":
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context_str = "App Slot A"
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elif args.target == "b":
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context_str = "App Slot B"
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_LOGGER.info(
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f"Flashing {context_str} with image {file_path} (size {total_size})"
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)
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for idx, segment in enumerate(loadable_segments):
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_LOGGER.info(
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f"Loadable section {idx} {segment.name} with offset {segment.offset:#08x} and size {segment.size}"
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)
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for segment in loadable_segments:
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segment_end = segment.offset + segment.size
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current_addr = segment.offset
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pos_in_segment = 0
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while pos_in_segment < segment.size:
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next_chunk_size = min(segment_end - current_addr, CHUNK_SIZE)
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data = segment.data[
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pos_in_segment : pos_in_segment + next_chunk_size
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]
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_LOGGER.info(
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f"Sending memory write command for address {current_addr:#08x} and data with "
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f"length {len(data)}"
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)
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next_packet = pack_memory_write_command(current_addr, data)
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com_if.send(next_packet.pack())
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current_addr += next_chunk_size
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pos_in_segment += next_chunk_size
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time.sleep(0.2)
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if args.target == "bl":
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_LOGGER.info("Blanking the bootloader checksum")
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# Blank the checksum. For the bootloader, the bootloader will calculate the
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# checksum itself on the initial run.
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checksum_write_packet = pack_memory_write_command(
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BOOTLOADER_CRC_ADDR, bytes([0x00, 0x00, 0x00, 0x00])
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)
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com_if.send(checksum_write_packet.pack())
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else:
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crc_addr = None
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size_addr = None
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if args.target == "a":
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crc_addr = APP_A_CRC_ADDR
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size_addr = APP_A_SIZE_ADDR
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elif args.target == "b":
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crc_addr = APP_B_CRC_ADDR
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size_addr = APP_B_SIZE_ADDR
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assert crc_addr is not None
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assert size_addr is not None
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_LOGGER.info(
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f"Writing app size {total_size } at address {size_addr:#08x}"
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)
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size_write_packet = pack_memory_write_command(
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size_addr, struct.pack("!I", total_size)
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)
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com_if.send(size_write_packet.pack())
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time.sleep(0.2)
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crc_calc = PredefinedCrc("crc-32")
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for segment in loadable_segments:
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crc_calc.update(segment.data)
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checksum = crc_calc.digest()
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_LOGGER.info(
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f"Writing checksum 0x[{checksum.hex(sep=',')}] at address {crc_addr:#08x}"
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)
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checksum_write_packet = pack_memory_write_command(crc_addr, checksum)
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com_if.send(checksum_write_packet.pack())
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while True:
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data_available = com_if.data_available(0.4)
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if data_available:
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reply = com_if.receive()
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# TODO: Parse replies
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print("Received replies: {}", reply)
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break
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com_if.close()
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return 0
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def pack_memory_write_command(addr: int, data: bytes) -> PusTc:
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app_data = bytearray()
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app_data.append(BOOT_NVM_MEMORY_ID)
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# N parameter is always 1 here.
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app_data.append(1)
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app_data.extend(struct.pack("!I", addr))
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app_data.extend(struct.pack("!I", len(data)))
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app_data.extend(data)
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return PusTc(
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apid=0,
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service=MEMORY_SERVICE,
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subservice=RAW_MEMORY_WRITE_SUBSERVICE,
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app_data=app_data,
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)
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if __name__ == "__main__":
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main()
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