17
DEC 3000 AXP PALcode
DEC 3000 AXP system Privileged Architecture Library code (PALcode) includes
standard DECchip 21064 CPU PALcode in both its OpenVMS and DEC OSF/1
version and DEC 3000 AXP-specific PALcode.
PALcode resides in the FLASH ROMs, located as follows:
• 300 Models
Resides in one of the two FLASH ROMs in COREIO space on the system
board
• 400/600/700 Models
Resides in one of the two FLASH ROMs in COREIO space on the I/O board
• 500/800/900 Models
Resides in the FLASH ROM that is part of the SFB design on the system
board
The DEC 3000 AXP serial ROM loads the code from the FLASH ROMs into
memory and enters the PALcode at the RESET entry point.
This chapter covers the following topics:
• Entering PALcode (Section 17.1)
• Supported CALL_PAL Instructions (Section 17.2)
• MACHINE_RESET PALcode (Section 17.3)
• Machine Check PALcode (Section 17.4)
• INTERRUPT PALcode (Section 17.5)
17.1 Entering PALcode
PALcode can be entered under one of the following conditions:
• Power is applied to the system; PALcode is entered at the RESET entry point.
• An exception or interrupt occurs.
• A CALL_PAL ALPHA instruction is executed.
DEC 3000 AXP PALcode 17–1
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