Configuring HP-UX For Peripherals

276 AppendixC

Major and Minor Numbers

Minor Number Bit Assignments

The tables on the following pages show the bit assignments for bits 16

through 31 for the principal HP device drivers. In all cases, bits 8

through 15 (that is NN in hexadecimal 0xNN0000) encode the card

instance of the interface card through which the device communicates.

Table C-4 Bit Assignments for Tape Devices

bits 16-19 20-23 24-27 28-31

stape

tape2

SCSI target SCSI LUN 24 - BSD behavior at close

25 - No rewind

26 - Conﬁguration method

27-31 - Index/Density

a. If 1, bits 27-31 mean Index. If 0, bits 27-31 mean Density.

b. Index and Density are generated as needed by mksf (1M). Density is

encoded as a ﬁeld in the minor number, using a constant of the form

DEN_M_*, as deﬁned in /usr/include/sys/mtio.h. Index refers

to an index into the property table used to specify extended

conﬁguration options (using the mt_property_type data structure

deﬁned in /usr/include/sys/mtio.h.) For further discussion, see

mt (7) in the HP-UX Reference.