Abstract: The aspects of the present invention provide a computer implemented method, an apparatus, and a computer usable program code for identifying a service processor with current setting information. First stored information for a service processor is retrieved from a first memory in the first service processor. Second stored information for the service processor is retrieved from a second memory in a data processing system to which the service processor is connected. The first stored information is compared with the second stored information to form a comparison as to whether the service processor was previously connected to the data processing system and to determine whether the service processor was a last service processor to fully communicate with system firmware in the data processing system. The service processor has current setting information if the service processor was previously connected to the data processing system and was the last service processor to fully communicate with the system firmware.

Abstract: A method and data processing system for isolating a faulty component in a computer. A first microcontroller detects a fault in a component of a computer. Responsive to detecting the fault, the first microcontroller sets a first fault record for the component to pending fault, sets a second fault record for the first microcontroller to pending fault, and fails over to a second microcontroller. If the second microcontroller detects the fault in the component of the computer, then the first fault record for the component is set to permanent fault, and the second fault record for the first microcontroller is cleared. If the second microcontroller determines the component of the computer does not have the fault, then the first fault record for the component is cleared, and the second fault record for the first microcontroller is set to permanent fault.

Abstract: A JTAG bus cross point switching device that is commanded by the same bus which it configures. In a preferred embodiment a JTAG chain includes a cross point switching device that is capable of adding, omitting, or rearranging devices on a JTAG bus. The switching device itself is controlled by commands on the JTAG bus which it configures.

Abstract: Commanding a JTAG bus cross point switching device by the same bus which it configures. Adding, omitting, or rearranging devices on a JTAG bus with a cross point switching device that is included in a JTAG chain. Controlling the switching device with commands on the JTAG bus which it configures.

Abstract: A method and data processing system for isolating a faulty component in a computer. A first microcontroller detects a fault in a component of a computer. Responsive to detecting the fault, the first microcontroller sets a first fault record for the component to pending fault, sets a second fault record for the first microcontroller to pending fault, and fails over to a second microcontroller. If the second microcontroller detects the fault in the component of the computer, then the first fault record for the component is set to permanent fault, and the second fault record for the first microcontroller is cleared. If the second microcontroller determines the component of the computer does not have the fault, then the first fault record for the component is cleared, and the second fault record for the first microcontroller is set to permanent fault.

Abstract: In a computer system, upon the occurrence of a reboot command, RunTime Abstraction Services (RTAS) microcode is loaded onto a first host processor. The service processor, upon request from the RTAS microcode, then issues a command to reset all host processors other than the first host processor on which the RTAS microcode resides, and then the RTAS microcode issues a series of commands to reset all I/O adapters. Once the host processors and I/O adapters have been reset, they are initialized to a predetermined, known state. Only after the host processors and I/O adapters have been reset and initialized is the reboot request executed. By resetting all but the first host processor and the I/O adapters before executing the reboot request, all activity originating from the host processors and from the I/O drawers is terminated, so that when the reboot request is executed, the host processors and I/O drawers are ready for initialization.