Motorola MVME187 User Manual
Disk I/O Support
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Disk I/O Support
187Bug can initiate disk input/output by communicating with
intelligent disk controller modules over the VMEbus.
intelligent disk controller modules over the VMEbus.
This section covers:
❏
Blocks Versus Sectors
❏
Device Probe Function
❏
Disk I/O via 187Bug Commands
❏
Disk I/O via 187Bug System Calls
❏
Default 187Bug Controller and Device Parameters
❏
Disk I/O Error Codes
Disk Support Facilities
Disk support facilities built into 187Bug consist of the following:
❏
Command-level disk operations
❏
Disk I/O system calls (only via one of the TRAP #496
instructions) for use by user programs
instructions) for use by user programs
❏
Defined data structures for disk parameters
Parameter Tables
Parameters such as the address where the module is mapped and
the type and number of devices attached to the controller module
are kept in tables by 187Bug. Default values for these parameters
are assigned at powerup and cold-start reset, but may be altered as
described in the section on default parameters, later in this chapter.
the type and number of devices attached to the controller module
are kept in tables by 187Bug. Default values for these parameters
are assigned at powerup and cold-start reset, but may be altered as
described in the section on default parameters, later in this chapter.
Supported Controllers
Appendix B contains a list of the controllers presently supported, as
well as a list of the default configurations for each controller.
well as a list of the default configurations for each controller.