Vax 613 0S Instruction Manual Page 192

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12.2 Overview of the Console
The console program operates a terminal device that may be one of the following:
A terminal connected to a serial port line (for example, the printer port)
A workstation display device and LK401 keyboard
A remote system connected over the Ethernet using MOP protocol.
Chapter 16 describes the console program, operation, commands, and security
measures.
12.3 Overview of Extended Self-Test/Utilities
Entering the TEST command at the console prompt starts an extended self-test
or a utility. The console passes a list of device numbers and test parameters
to the test command dispatcher. The test dispatcher runs the self-test for each
device number that is passed, until an error occurs or all the tests complete.
The test dispatcher is the code that locates, loads, starts, and receives the status
of a test command. The test dispatcher uses the main configuration table (MCT),
device configuration tables (DCTs), and driver data structures while a self-test
diagnostic runs. Section 15.1 decribes the main configuration table; Section 15.2
describe the device configurations tables.
The test dispatcher performs these steps to run a self-test diagnostic:
Use the device number to index into the MCT.
Fetch the pointer to the device’s DCT from the MCT.
Obtain a pointer to the device’s directory entries in the DCT.
Scan all directories for a directory of self-test directory type (= 1).
Read the flags field of the DCT to determine if the diagnostic uses a shared
diagnostic driver
If the self-test diagnostic uses a shared driver, the dispatcher finds the
directory entry and the pointer to the driver descriptor.
Call the device’s self-test function.
The device’s self-test function determines which test is run by the test
name(s) that is passed to it.
If you want to test a TURBOchannel option, the test command dispatcher
intercepts the command and calls the MIPS emulator specifying the correct
parameters. The MIPS emulator executes the TURBOchannel option test code.
12.4 Overview of PALcode
The PALcode includes all standard Alpha AXP Privileged Architecture Library
routines, as well as any other required machine-specific PAL routines. The
Alpha Architecture Reference Manual provides further information on PALcode.
Chapter 17 describes DEC 3000 PALcode in greater detail.
12–4 Firmware: Overview
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