NAME

njata — Workbit NinjaATA-32 CardBus IDE controller driver

SYNOPSIS

njata* at cardbus? function ?
njata* at cardbus? function ? flags 0x01 # with wait 0x01

DESCRIPTION

The njata driver provides support for the following Workbit Bus-Master CardBus IDE controller chips:

NinjaATA-32Bi

CardBus / PCMCIA dual mode IDE controller (“DuoATA”). This controller is mainly used for portable drives. This driver supports the CardBus mode.

NPATA-32

CardBus IDE controller. This controller is widely used for CardBus CompactFlash adapters.

These controllers are capable of bus-mastering for ATA PIO transfer. The njata driver uses the bus-mastering PIO transfer unless transfer buffer is unaligned, and significantly reduces CPU usage for PIO-only ATA devices compared with usual PIO transfer.

CONFIGURATION

The optional flags parameter is the “wait” value for ATA transfers. Some combinations of host and device may fail without flags parameter or flags 0x00. In this case try adding wait values like flags 0x01 or flags 0x11 (the wait parameter is composed of two 4bit values). Smaller wait values should be faster. Too long waits may cause transfer errors.

SEE ALSO

ata(4), atapi(4), cardbus(4), intro(4), wd(4), wdc(4)

HISTORY

The njata device driver first appeared in NetBSD 4.0.

AUTHORS

ITOH Yasufumi