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AHSC(4)              NetBSD/amiga Kernel Interfaces Manual             AHSC(4)


NAME

     ahsc -- A3000 low level SCSI interface


SYNOPSIS

     ahsc0 at mainbus0


DESCRIPTION

     The Amiga architecture uses a common machine independent scsi sub-system
     provided in the kernel source.  The machine independent drivers that use
     this code access the hardware through a common interface. (see
     scsibus(4)) This common interface interacts with a machine dependent
     interface, such as ahsc, which then handles the hardware specific issues.

     The ahsc interface handles things such as DMA and interrupts as well as
     actually sending commands, negotiating synchronous or asynchronous trans-
     fers and handling disconnect/reconnect of SCSI targets.  The hardware
     that ahsc uses is based on the WD33c93 SCSI chip.


DIAGNOSTICS

     sbicwait TIMEO @%d with asr=x%x csr=x%x  The 33c93 code (sbic) has been
     waiting too long for a SCSI chip operation to complete. %d is the line in
     the source file amiga/dev/sbic.c at which the SCSI chip timed-out.  Asr
     and csr are status registers within the SCSI chip.

     ahsc%d: abort %s: csr = 0x%02x, asr = 0x%02x  A SCSI operation %s was
     aborted due to an error.

     ahsc%d: csr == 0x%02i  A error has occurred within the SCSI chip code.

     ahsc%d: unexpected phase %d in icmd from %d  The target described by
     `from %d' has taken the SCSI bus into a phase which is not expected dur-
     ing polled IO.

     ahsc%d: unexpected phase %d in icmd from %d  The target described by
     `from %d' has taken the SCSI bus into a phase which is not expected dur-
     ing DMA IO setup.


SEE ALSO

     scsibus(4)


HISTORY

     The ahsc interface first appeared in NetBSD 1.0

NetBSD 6.0                      August 31, 1994                     NetBSD 6.0