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    SubjectRe: serial flow control appears broken
    > I had previously thought that the control of RTS was something that the 
    > serial/tty driver was supposed to do independently based on the buffer
    > fill. Was I wrong?

    If the kernel is asked to do CRTSCTS then the kernel handles the flow
    control. It uses it when the internal buffers are nearly full.

    The direct access to the lines is normally only used by special drivers
    such as half duplex radio modem drivers.
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