Uniden Data 2000 Wireless CDPD PC Card Guía de usuario descargar pdf (Pagina 13)

anything other than ``yes'', then the startup script will be disabled.

PCIC

This identifies the PC Card Interface Controller driver module. There are two options: ``tcic''

or ``i82365''. Virtually all current controllers are in the ``i82365'' group. This is the only

mandatory option setting.

PCIC_OPTS

This specifies options for the PCIC module. Some host controllers have optional features that

may or may not be implemented in a particular system. In some cases, it is impossible for the

socket driver to detect if these features are implemented. See the corresponding man page for

a complete description of the available options.

CORE_OPTS

This specifies options for the pcmcia_core module, which implements the core PC Card

driver services. See ``man pcmcia_core'' for more information.

CARDMGR_OPTS

This specifies options to be passed to the cardmgr daemon. See ``man cardmgr'' for

more information.

SCHEME

If set, then the PC Card configuration scheme will be initialized to this at driver startup time.

See the Overview of the PCMCIA configuration scripts for a discussion of schemes.

The low level socket drivers, tcic and i82365, have various bus timing parameters that may need to be

adjusted for certain systems with unusual bus clocking. Symptoms of timing problems can include card

recognition problems, lock−ups under heavy loads, high error rates, or poor device performance. Only certain

host bridges have adjustable timing parameters: check the corresponding man page to see what options are

available for your controller. Here is a brief summary:

• Cirrus controllers have numerous configurable timing parameters. The most important seems to be

the cmd_time flag, which determines the length of PCMCIA bus cycles. Fast 486 systems (i.e.,

DX4−100) seem to often benefit from increasing this from 6 (the default) to 12 or 16.

• The Cirrus PD6729 PCI controller has the fast_pci flag, which should be set if the PCI bus speed

is greater than 25 MHz.

• For Vadem VG−468 controllers and Databook TCIC−2 controllers, the async_clock flag changes

the relative clocking of PCMCIA bus and host bus cycles. Setting this flag adds extra wait states to

some operations. However, I have yet to hear of a laptop that needs this.

• The pcmcia_core module has the cis_speed parameter for changing the memory speed used

for accessing a card's Card Information Structure (CIS). On some systems with fast bus clocks,

increasing this parameter (i.e., slowing down card accesses) may be beneficial for card recognition

problems.

• This is not a timing issue, but if you have more than one ISA−to−PCMCIA controller in your system

or extra sockets in a docking station, the i82365 module should be loaded with the

Linux PCMCIA HOWTO

2.3 Startup options 10

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Uniden Data 2000 Wireless CDPD PC Card Guía de usuario Pagina 13