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
NetBSD4.0.
AUTHORS
ITOH Yasufumi <itohy@NetBSD.org>