Method and apparatus for using a development port for boot up

Electrical computers and digital processing systems: support – Digital data processing system initialization or configuration – Loading initialization program

Reexamination Certificate

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Details

C713S152000, C709S200000

Reexamination Certificate

active

07111160

ABSTRACT:
The development port or Debug port of a microprocessor on an intelligent daughterboard is used for downloading code or configuration information from a motherboard for use in boot-up. In various aspects, the code or configuration information can include information used for configuring a port, other than the development port, and/or for configuring a memory controller, such as for a daughterboard DRAM. Use of the Debug port makes it possible to reduce or eliminate the need for storing boot-up code or configuration information on a daughterboard ROM, or other non-volatile memory, thus reducing cost and space requirements, power consumption and the like.

REFERENCES:
patent: 5878248 (1999-03-01), Tehranian et al.
patent: 6003130 (1999-12-01), Anderson
patent: 6105136 (2000-08-01), Cromer et al.
patent: 6161177 (2000-12-01), Anderson
patent: 6449732 (2002-09-01), Rasmussen et al.
Applied Microsystems Corporation; Emulator Installation Guide; Code TAP® for the Motorola® MPC8XX; Apr. 1997; cover sheet, Chapter 1—Overview, pp. 1-7 through 1-8 and Chapter 4—Connecting to the Target, pp. 4-1 through 4-11.
Motorola MPC860 User's Manual; Figure 1-1.MPC860 Block Diagram, Section 4—Reset pp. 4-1 through 4-11 and Support Development pp. 18-20 through 18-40.

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