Passing the Configuration to UOS

Parent Previous Next

Passing the Configuration to UOS

Configuration information is passed to UOS in a file on the boot device.  If the boot device is read-only, the information is written to a buffer. In either case, the configuration data contains a series of records with configuration data. Each record consists of a one byte record type, followed by one or more parameters appropriate to the type of record. The parameters consist of fixed and variable-length values. The fixed values vary in size from 1 to 8 bytes (1, 2, 4, and 8 byte values). The  size is encoded in the record type.


Mask (Record type and 3)

Description

0

1 byte

1

2 bytes

2

4 bytes

3

8 bytes


Thus, record types 0-3 are the same record type, but with different sizes for fixed-size parameters. Here are the record types supported:


Record type(s)

Description

Parameters

0-3

Disabled device

type, controller, unit

4-7

RAM disk

address, size

8-11

Boot device

type, controller, unit


Note that any record types not shown are reserved for future use.