old-www/HOWTO/Remote-Serial-Console-HOWTO/bugs-bootloaderflow.html

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>A.8. Boot loader has no flow control</H1
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>Most boot loaders do not support
<SPAN
CLASS="ACRONYM"
>CTS</SPAN
>/<SPAN
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>RTS</SPAN
> flow control. This can
cause some data loss where large speed mis-matches exist, as is
often the case with a modern modem connected into a
9600<SPAN
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> fixed-speed port.</P
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> 1.66 supports flow
control.</P
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