January 6, 2007 CARDBUS 4

### NAME

cardbus, cardslot, cbb - CardBus driver

### SYNOPSIS

cbb* at pci? dev? function ? cardslot* at cbb? cardbus* at cardslot? pcmcia* at cardslot? XX* at cardbus? function ?

### DESCRIPTION

NetBSD provides machine-independent bus support and drivers for CardBus devices.

The cbb device represents the CardBus controller. Each controller has a number of slots, represented by the cardslot devices. A slot can have either a CardBus card or a PCMCIA card, which are attached with the cardbus or pcmcia devices, respectively.

### SUPPORTED DEVICES

NetBSD includes the following machine-independent CardBus drivers, sorted by function and driver name:

#### Network interfaces

ath
  Atheros 5210/5211/5212 802.11
atw
  ADMtek ADM8211 (802.11)
ex
  3Com 3c575TX and 3c575BTX
fxp
  Intel i8255x
ral
  Ralink Technology RT25x0 (802.11)
rtk
  Realtek 8129/8139
rtw
  Realtek 8180L (802.11)
tlp
  DECchip 21143

#### Serial interfaces

com
  Modems and serial cards

#### SCSI controllers

adv
  AdvanSys 1200[A,B], 9xx[U,UA]
ahc
  Adaptec ADP-1480
njs
  Workbit NinjaSCSI-32

#### USB controllers

ehci
  Enhanced Host Controller (2.0)
ohci
  Open Host Controller
uhci
  Universal Host Controller

#### IEEE1394 controllers

fwohci
  OHCI controller

### DIAGNOSTICS

cbb devices may not be properly handled by the system BIOS on i386-family systems. If, on an i386-family system, the cbb driver reports
```cbb0:` `NOT` `USED` `because` `of` `unconfigured` `interrupt`
then enabling

  options PCI_ADDR_FIXUP
  options PCI_BUS_FIXUP
  options PCI_INTR_FIXUP

or (if ACPI is in use)

  options PCI_INTR_FIXUP_DISABLED

in the kernel configuration might be of use.

### SEE ALSO

adv(4), ahc(4), ath(4), atw(4), com(4), ehci(4), ex(4), fxp(4), njs(4), ohci(4), options(4), pci(4), pcmcia(4), ral(4), rtk(4), rtw(4), tlp(4), uhci(4)

### HISTORY

The cardbus driver appeared in NetBSD1.5.

### BUGS

#### Memory space conflicts

NetBSD maps memory on Cardbus and PCMCIA cards in order to access the cards (including reading CIS tuples on PCMCIA cards) and access the devices using the RBUS abstraction. When the mapping does not work, PCMCIA cards are typically ignored on insert, and Cardbus cards are recognized but nonfunctional. On i386, the kernel has a heuristic to choose a memory address for mapping, defaulting to 1 GB, but choosing 0.5 GB on machines with less than 192 MB RAM and 2 GB on machines with more than 1 GB of RAM. The intent is to use an address that is larger than available RAM, but low enough to work; some systems seem to have trouble with addresses requiring more than 20 address lines. On i386, the following kernel configuration line disables the heuristics and forces Cardbus memory space to be mapped at 512M; this value makes Cardbus support (including PCMCIA attachment under a cbb) work on some notebook models, including the IBM Thinkpad 600E (2645-4AU) and the Compaq ARMADA M700:

options RBUS_MIN_START="0x20000000"