SR(4) i386 Kernel Interfaces Manual SR(4) NAME sr -- synchronous RISCom/N2 / WANic 400/405 device driver SYNOPSIS device sr0 at isa? port 0x300 irq 10 iomem 0xd0000 device sr1 at isa? port 0x310 irq 11 flags 0x1 iomem 0xd0000 pseudo-device sppp DESCRIPTION The sr driver supports the RISCom/N2 ISA cards and the WANic 400/405 PCI cards that is based on the HD64570 chip. The standard FreeBSD sppp code is used for the link level layer. The de- fault protocol used is PPP. The Cisco HDLC protocol can be used by adding link2 to ifconfig(8). Alternately, the driver can be compiled to support netgraph(4) (see below). The flags field is optional. If it isn't specified, the driver will assume the following: The card has 2 ports. The clock for the serial ports is external and the transmitter uses the same clock as the receiver. The flags are a bit field and can be used to force a different behaviour than the default. 0x01 The card has only one port. 0x10 Use separate external clocks for transmit and receive on port 0. 0x40 Use separate external clocks for transmit and receive on port 1. NUMBERING Only one line for each card is needed in the kernel configuration file. The first card's ports will be installed from sr0. The numbering of the next card will continue where the first stopped, eg. if the first card is a two port card it will use sr0 and sr1. The next card will then start at sr2. The card only supports IRQ 3, 4, 5, 7, 10, 11, 12 and 15. The iomem area is a 16Kb block and must start at a 16Kb boundary. NETGRAPH SUPPORT If the kernel is compiled with options NETGRAPH then the sppp and Cisco HDLC modes are disabled (and the sppp driver is unneeded), and this driver functions as a netgraph(4) node with a single hook named rawdata. Connect- ing to this hook enables the transmission of raw HDLC frames. The node will have the same name as the device with ``sync_'' prepended, e.g., sync_sr0. DIAGNOSTICS sr%d: Warning illegal interrupt %d. The card cannot use the specified in- terrupt. Choose a different one. FILES /sys/i386/isa/ic/hd64570.h /sys/i386/isa/if_srregs.h /sys/i386/isa/if_sr.c /sys/i386/isa/if_sr.h /sys/pci/if_sr_p.c BUGS At the moment only the X.21 interface is tested. The others may need tweaks to the clock selection code. The code can probably stand some optimizing. SEE ALSO ar(4), cx(4), netgraph(4), netintro(4), ifconfig(8) AUTHORS The sr device driver was written by John Hay <jhay@FreeBSD.org>. Netgraph support was added by Julian Elischer <julian@FreeBSD.org>. FreeBSD 4.5 July 4, 1996 SR(4)
NAME | SYNOPSIS | DESCRIPTION | NUMBERING | NETGRAPH SUPPORT | DIAGNOSTICS | FILES | BUGS | SEE ALSO | AUTHORS
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