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