Dell Products Inc.

Christopher Domingo Arzola

Austin Patrick Bolen

Hahn Norden

Elie Antoun Jreij

Rama Rao Bisa

Chitrak Gupta

Kala Sampathkumar

Manjunath Am

Komal Kumar Dhote

Prasanna Kumar Sahoo

Suresh Vijaykumar

Embodiments are described for operating a device management bus coupled to a remote access controller and a managed device. The remote access controller detects an inoperable state of the bus and determines a FRU (Field Replaceable Unit) memory is accessible on the managed device. A predefined reset indicator is written to the FRU memory. The managed device monitors for the reset indicator being written to a specified location in FRU memory. Upon detecting the reset indicator in FRU memory, the managed device resets a bus controller coupled to the device management bus and transmits a reset notification on the device management bus. The remote access controller may include an I2C shim that controls access to an I2C multiplexer utilized for transmitting I2C commands from a service processor and an I2C coprocessor, preventing certain inoperable bus states due to concurrent operation of the I2C multiplexer by the I2C coprocessor and the service processor.

System and method for managing, resetting and diagnosing failures of a device management bus

Methods, systems, and computer programs encoded on computer storage medium, for determining a unique identifier and a firmware version of each device; updating a cache storage to store the unique identifier and the firmware version for each device; generating, for a particular device, a command that is to be performed at the particular device; accessing the cache storage to identify the cached unique identifier and the cached firmware version for the particular device; transmitting, to a device driver or the particular device, the command and data indicating the cached unique identifier and the cached firmware version for the particular device; determining, by the device driver or the particular device, that i) the cached unique identifier matches a current unique identifier for the particular device and ii) the cached firmware version matches a current firmware version for the particular device; and completing the command at the particular device.

System and method for controlling management commands at devices

A device hot-plug system includes a chassis. A connector is included in the chassis. A reset pin is included on the connector. A hot-plug device is configured, in response to being hot-plugged to the connector, to enter a device reset state. While in the device reset state, the hot-plug device monitors a reference clock and determines that the reference clock has been stable for a predetermined time period. In response to determining that the reference clock has been stable for a predetermined time period, the hot-plug device exits the device reset state and provides a de-assertion signal on the reset pin.

Device hot plug system

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Round Rock, TX, United States of America

Christopher Domingo Arzola