Specifications

evice Driver Programming

5-8

• Invalid transfer

• Nonexistent device addressed

• Device correctly addressed but malfunctioning

The kernel tries to recognize VME bus errors and determines their cause. The most

common response by the kernel is to panic the system. A panic halts the system so that the

administrator can fix a malfunctioning board or device, or take some other corrective

action.

An alternative system service, iobus_err(2), can handle some types of VME bus

errors without panicking the system. This service supports environments in which

panicking the system is an undesirable response to bus errors, such as real-time or

production mode. See Chapter 16, “Special Considerations” for more information.,

Device Drivers and VME Bus Errors and the iobus_err(2) man page for details on

this service.

VME Device Address Assignment and Conﬁguration 5

The Motorola MVME1604 Architecture Manual documents the range of addresses

reserved within the system memory map for I/O purposes.

Jumpers, switches, or programmable assemblies (Programmable Read Only Memory

(PROM) or Programmable Array Logic (PAL)) normally set VME device addresses:

• If set by jumpers or switches, refer to the device installation manual for

selecting the proper valid address and address modiﬁer.

• If set by programmable assembly, and if either the address falls outside

valid VME address space or generates the wrong VME address modifier,

then the device vendor must build a programmable assembly for a suitable

address.

NOTE

Installing components not specified or marketed by the device

vendor might void the warranty. Patent and copyrights that apply

to the device also cover programmable assemblies, which require

written permission from the vendor to modify or copy. (License

fees might accompany such permission.) With such permission,

Concurrent Computer Corporation can provide PALs to address

third-party devices. A different -90x number for each valid

address on the top-level assembly number identifies PALs

supplied by Concurrent Computer Corporation.