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CONFIG_DMASCC: High-speed (DMA) SCC driver for AX.25

General informations

The Linux kernel configuration item CONFIG_DMASCC:

Help text

This is a driver for high-speed SCC boards, i.e. those supporting DMA on one port. You usually use those boards to connect your computer to an amateur radio modem (such as the WA4DSY 56kbps modem), in order to send and receive AX.25 packet radio network traffic.

Currently, this driver supports Ottawa PI/PI2, Paccomm/Gracilis PackeTwin, and S5SCC/DMA boards. They are detected automatically. If you have one of these cards, say Y here and read the AX25-HOWTO, available from

This driver can operate multiple boards simultaneously. If you compile it as a module (by saying M instead of Y), it will be called dmascc. If you don't pass any parameter to the driver, all possible I/O addresses are probed. This could irritate other devices that are currently not in use. You may specify the list of addresses to be probed by ",addr2,..." (when compiled into the kernel image) or "io=addr1,addr2,..." (when loaded as a module). The network interfaces will be called dmascc0 and dmascc1 for the board detected first, dmascc2 and dmascc3 for the second one, and so on.

Before you configure each interface with ifconfig, you MUST set certain parameters, such as channel access timing, clock mode, and DMA channel. This is accomplished with a small utility program, dmascc_cfg, available at Please be sure to get at least version 1.27 of dmascc_cfg, as older versions will not work with the current driver.



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