njata(4) [netbsd man page]

NJATA(4)						   BSD Kernel Interfaces Manual 						  NJATA(4)

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

BSD
								 September 7, 2006							       BSD

GEODEIDE(4)						   BSD Kernel Interfaces Manual 					       GEODEIDE(4)

NAME

     geodeide -- AMD Geode IDE disk controllers driver

SYNOPSIS

     geodeide* at pci? dev ? function ? flags 0x0000

DESCRIPTION

     The geodeide driver supports the AMD Geode CS5530A and SC1100 IDE controllers, and provides the interface with the hardware for the ata(4)
     driver.

     The 0x0002 flag forces the geodeide driver to disable DMA on chipsets for which DMA would normally be enabled.  This can be used as a debug-
     ging aid, or to work around problems where the IDE controller is wired up to the system incorrectly.

SEE ALSO

     ata(4), atapi(4), intro(4), pci(4), pciide(4), wd(4), wdc(4)

BUGS

     The SC1100 controller requires 4-byte aligned data transfers and cannot handle transfers of exactly 64 kilobytes.

     The CS5530 multifunction chip/core's IDE section claims to be capable of UDMA mode 2 (33.3MB/s) but in practice using that mode swamps the
     controller so badly that geodeide limits the UDMA negotiation to mode 1 (25MB/s) so that the other functions of this chip continue to work.

     The IDE DMA engine in the CS5530 can only do transfers on cache-line (16-byte) boundaries.  Attempts to perform DMA on any other alignment
     will crash the system.  This problem may also exist in the SC1100 since the CS5530 was its direct predecessor, and it is not clear that
     National Semiconductor fixed any bugs in it.

     The geodeide driver will reject attempts to DMA to buffers not aligned to the required boundary.  The wd(4) disk driver will back off to PIO
     mode to accomplish these transfer requests, at reduced system performance.

BSD
								   July 5, 2005 							       BSD