• Io工具使用


    功能:

    用 IO 指令可以实时读取或写入每个 IO 口的状态,这里简单介绍 IO 指令的使用。

    配置:

    make menuconfig -->utilities ---->打开 io

    make menuconfig -->Global build settings --> kernel build option -->打开 /dev/mem virtual device  support

    root@OpenWrt:~# io --help
    Unknown option: ?
    Raw memory i/o utility - $Revision: 2.0 $
    
    io -v -1|2|4 -r|w|a|o [-l <len>] [-f <file>] <addr> [<value>]
    
        -v         Verbose, asks for confirmation
        -1|2|4     Sets memory access size in bytes (default byte)
        -l <len>   Length in bytes of area to access (defaults to
                   one access, or whole file length)
        -r|w|a|o   Read from or Write to memory (default read)
                   optional write with modify (and/or)
        -f <file>  File to write on memory read, or
                   to read on memory write
        <addr>     The memory address to access
        <val>      The value to write (implies -w)
    
    Examples:
        io 0x1000                  Reads one byte from 0x1000
        io 0x1000 0x12             Writes 0x12 to location 0x1000
        io -2 -l 8 0x1000          Reads 8 words from 0x1000
        io -r -f dmp -l 100 200    Reads 100 bytes from addr 200 to file
        io -w -f img 0x10000       Writes the whole of file to memory
    
    Note access size (-1|2|4) does not apply to file based accesses.
    

      

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  • 原文地址:https://www.cnblogs.com/yuanqiangfei/p/15014181.html
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