Device driver parameters

Parameter	Dflt	Min	Max
DMAEXCL	0	0	2
NCPYRIGHT	10	1	100
NUMREGPT	256	1	5120
NUMSCOPT	32	0	1024
PDI_TIMEOUT	1	0	1
SDI_REGISTER_DELAY	60	1	600

DMAEXCL

This parameter controls a software lock that causes the four-channel DMA controller to use only one channel at a time, that is, not to use its capability to perform transfers on separate channels simultaneously. This is a software solution for problems with early production runs of the chips. Setting the value to ``1'' prevents simultaneous use of the channels within a single chip. Setting the value to ``2'' prevents simultaneous use of all channels for all chips.

NCPYRIGHT

The size of a kernel data structure used to print console initialization messages.

NUMREGPT

Specifies the number of regular pseudo-terminals. Changing this tunable parameter is not sufficient to change the number of pseudo-terminal devices on your system; you must also reinstall the nsu package.

NUMSCOPT

Specifies the number of SCO OpenServer-compatible pseudo-terminals. Changing this tunable parameter is not sufficient to change the number of pseudo-terminal devices on your system; you must also reinstall the acp package.

PDI_TIMEOUT

Enables and disables the SCSI command timeouts that allow for recovery from bus and device hangs. The default value is ``1'', which indicates that SCSI command timeouts are enabled. When the value is set to ``0'', the SCSI command timeouts are disabled.

SDI_REGISTER_DELAY

Specifies the delay period, in seconds, for devices becoming ready.