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ISAPNP(4) Device Drivers Manual ISAPNP(4)

isapnp
introduction to ISA Plug-and-Play support

isapnp0 at isa?

An isapnp bus can be configured for each supported ISA bus.
OpenBSD provides machine-independent bus support and drivers for ISA Plug-and-Play (isapnp) autoconfiguration of PnP-compatible devices on an ISA bus.

OpenBSD includes machine-independent ISAPNP drivers, sorted by function and driver name:

aic(4)
Adaptec AIC-6260 and AIC-6360 SCSI interface
wdc(4)
WD100x compatible hard disk controller driver

com(4)
serial communications interface

an(4)
Aironet 4500/4800 IEEE 802.11FH/b wireless interfaces
ef(4)
3Com Fast EtherLink ISA (3c515) 10/100 Ethernet device
ep(4)
3Com EtherLink III and Fast EtherLink III 10/100 Ethernet device
le(4)
AMD LANCE Ethernet device
ne(4)
NE2000 and compatible 10/100 Ethernet device
we(4)
Western Digital/SMC WD80x3, SMC Elite Ultra, and SMC EtherEZ Ethernet device

ess(4)
ESS Technology AudioDrive family audio device
gus(4)
Gravis UltraSound/UltraSound MAX audio device
mpu(4)
Roland/Yamaha MPU401 MIDI UART device
sb(4)
SoundBlaster family audio device

joy(4)
games adapter
pcic(4)
introduction to PCMCIA (PC Card) support

intro(4), isa(4)

The isapnp driver appeared in NetBSD 1.3.

From time to time an isapnp device will be found which the kernel does not recognize. The kernel matches isapnp devices to device drivers based on identifiers which each device provides. For example, this device:
joy0 at isapnp0 "Creative SB16 PnP, CTL7001, PNPB02F, Game" port 0x200/8
This joystick calls itself by the two names “CTL7001” and “PNPB02F”. The latter is a standard name (which the kernel automatically recognizes), but “CTL7001” is a vendor-specific name which needs to be added to a table. Unfortunately, some devices advertise only their vendor-specific name; for instance:
"PnP Sound Chip, @P@1001, , " at isapnp0 port 0x200/8 not configured
Testing will show that this device is actually a joystick. To resolve the issue, the actual name “@P@1001” has to be entered into the database found in /sys/dev/isa/pnpdevs and a new kernel must be built. Then the device will probe like this:
joy0 at isapnp0 "PnP Sound Chip, @P@1001, , " port 0x200/8
September 3, 2016 OpenBSD-current