njata
—
Workbit NinjaATA-32 CardBus IDE controller driver
njata* at cardbus? function ?
njata* at cardbus? function ? flags 0x01 # with wait
0x01
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.
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 4-bit values). Smaller wait
values should be faster. Too long waits may cause transfer errors.
The njata
device driver first appeared in
NetBSD 4.0.