Using ROS/EEROS As a Pseudo-Service Processor to Verify Field Replaceable Units and for Retry
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27
This article describes techniques for using read-only storage/ writable-electronically erasable read-only storage (ROS/EEROS) as a pseudo-service processor to verify field replaceable units (FRUs) and for retry. Conventionally, a ROS/EEROS module was used for initial microcode load (IML) power on tests and had little functional capability during operational mode. The ROS/EEROS module, since it is not required for normal operation during operational mode, can be used to support RAM- loaded code as a back-up if operational code loses control. This gives ROS/EEROS many reliability, availability and serviceability (RAS) capabilities to aid in isolation and recovery, and can reconfigure input output adapter (IOA) resources and report to the system the available configuration.