Scipt 将使用 md 命令通过 Uboot 从 DVR 转储内存

Question

所以我有这个 DVR，它被锁定了，所以我需要使用 U-boot 中的 md 命令来转储其内存，但是 u-Boot 每大约 15 秒重新启动一次，所以我需要分块转储内存，这是我的 shell 脚本

#!/usr/bin/expect

# Replace with the actual serial port of your device (e.g., /dev/ttyACM0)
set serial_port "/dev/ttyACM0"

# Replace with the starting memory address
set start_address 0xe1000000

# Replace with the size of each chunk
set chunk_size 0x3E00

# Replace with the target address to stop at
set stop_address 0xE100BA00

# Open a connection to the serial port
spawn cu -l $serial_port -s 115200

# Expect the message to stop autoboot
expect "Hit any key to stop autoboot:"
send "\r"
#after 2000
# Set the initial address
set current_address $start_address

# Dump memory in chunks
while {$current_address < $stop_address} {
    # Send the md command to the bootloader for the current chunk
    send "md $current_address $chunk_size\r"

    # Wait for the bootloader's response
    expect "Hit any key to stop autoboot:"
    send "\r"

    # Send any key to continue (press Enter)
    send "\r"
    # Update the current address for the next chunk
    set current_address [expr {$current_address + $chunk_size}]
}

# Close the connection
send "\x03"  ;# Send Ctrl+C to stop autoboot if needed
send "exit\r"
expect eof

因此，在第一次通电时，它确实会从内存中打印第一个块的内容，但在重新启动后，设备启动后会发送“\r”，预计“按任意键停止自动启动：”不起作用，我不知道为什么，任何建议 tnx ？