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2 Contains the I/O base address.
3 Contains a tag value that identifies 3Com 3C5x9 devices on an ISA bus.
4 Contains a value that indicates whether the user has ejected the
PCMCIA card.
5 Contains a value that indicates whether the user has reloaded the
PCMCIA card.
6 Contains a value that indicates whether the card is a PCMCIA card.
7 Declares a pointer to the card_info data structure and calls it cinfop.
The card_info data structure contains information that is necessary
to communicate with the kernel PCMCIA subsystem.
3.10 Defining the Broadcast Flag
The broadcast flag in the if_el driver’s el_softc data structure indicates
whether the device should receive broadcast traffic. This flag is specific to
the if_el driver and, therefore, is optional in most network device drivers.
The following code shows the declaration of the broadcast flag in the if_el
device driver’s el_softc data structure:
int is_broadcast; 1
1 Contains a boolean value. If true, the broadcast address flag is set.
3.11 Defining the Debug Flag
The debug flag in a network driver’s softc data structure indicates whether
debug mode is on. The following code shows the declaration of the debug
flag in the if_el device driver’s el_softc data structure. The debug flag
is optional.
int debug;
1
1 Contains the status of the debug flag. If the if_flags member of
the ifnet data structure pointer is set to IFF_DEBUG, debug is on.
Otherwise, debug is off.
3.12 Defining Interrupt and Timeout Statistics
The interrupt and timeout statistics in the if_el driver’s el_softc data
structure consists of information about timeout and interrupt events.
3–8 Defining the softc Data Structure