See http://roadrunner.swansea.linux.org.uk/synchronous.shtml for more info
This driver provides the back end protocol support for syncppp and cisco hdlc
in Linux sync drivers, a (fairly) generic Z8530/Z85C30/Z85230 synchronous
support layer and an example driver that uses it (the Comtrol Hostess SV-11).
PIO, DMA transmit and dual DMA rx/tx modes are all supported. ESCC enhanced
DMA modes are not yet supported however.
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