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WD(4)                     NetBSD Programmer's Manual                     WD(4)


NAME

     wd - WD100x compatible hard disk driver


SYNOPSIS

     wd* at wdc? channel ? drive ? flags 0x0000
     wd* at pciide? channel ? drive ? flags 0x0000
     wd* at umass?


DESCRIPTION

     The wd driver supports hard disk which emulate the Western Digital
     WD100x.  This includes standard MFM, RLL, ESDI, IDE and EIDE drives.

     The flags are used only with controllers that support DMA operations and
     mode settings (like some pciide controllers).  The lowest order nibble
     (rightmost digit) of the flags define the PIO mode to use, the next set
     of four bits the DMA mode and the third nibble the UltraDMA mode.  For
     each set of four bits, the 3 lower bits define the mode to use and the
     last bit must be set to 1 for this setting to be used.  For DMA and UDMA,
     0xf (1111) means 'disable'.  For example, a flags value of 0x0fac (1111
     1010 1100) means 'use PIO mode 4, DMA mode 2, disable UltraDMA'.  0x0000
     means "use whatever the drive claims to support.


SEE ALSO

     intro(4), pciide(4), scsi(4), umass(4), wdc(4), atactl(8)

NetBSD 1.6.1                   October 15, 1998                              1