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8 serial rom and debug port support, Serial rom and debug port support, 8 serial rom and debug port support – Compaq 164SX User Manual

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Functional Description

Serial ROM and Debug Port Support

4.8 Serial ROM and Debug Port Support

Though it is not needed for normal operation, there is logic support for the use of a
serial ROM and debug port. If an SROM is populated, the 21164PC loads its boot
code from the SROM instead of from flash ROM. This code initializes the system,
then transfers control to either the Mini-Debugger or the selected firmware, depend-
ing upon the setting of the configuration jumper.