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Startup and Operation
2
defaults. In most cases there is no need to modify the firmware
configuration before you boot the operating system.
For further information on the firmware, refer to Chapter 3, EPPCBug
Firmware, or to the EPPCBug Firmware Package User’s Manual listed in
Appendix B, Related Documentation.
Note Any devices or interface circuits you implement that require
analog power (−12V, −5V, or +12V) must wait to initialize until
the digital power on the MBX is ready. (See Power Monitor
Circuit on page 5-13.)
Initialization Process
When you power up (or reset) the system, EPPCBug executes some self-
checks and proceeds to the hardware initialization. The following
hardware components are initialized at power up/reset:
❏ MPC821/860 PowerPC Core
❏ MPC821/860 System Interface Unit (SIU)
❏ MPC821/860 Memory Controller and Memory
❏ Primary PCI Bus Bridge Device (QSpan; standard configuration
only)
❏ ISA Bus Bridge Device (Winbond W83C553F; standard
configuration only)
❏ Peripheral I/O Device (SMC 37C672; standard configuration
only)
❏ PCI Address Space Configuration and PCI Device Configuration
(standard configuration only)
❏ PCMCIA Module Configuration
The system startup flows in a predetermined sequence, following the
hierarchy inherent in the hardware. The following illustration charts the
flow of the basic initialization sequence that takes place during PowerPC
system startup.
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