International Business Machines Corporation

Lenovo (singapore) Pte. Ltd.

Sean P Brogan

Sumeet Kochar

Mehul M Shah

Ryuji Orita

Mark A Brandyberry

Embodiments comprise systems, methods and media for updating CRTM code in a computing machine. In one embodiment, the CRTM code initially resides in ROM and updated CRTM is stored in a staging area of the ROM. A logical partition of L2 cache may be created to store a heap and a stack and a data store. The data store holds updated CRTM code copied to the L2 cache. When a computing system is started, it first executes CRTM code. The CRTM code checks the staging area of the ROM to determine if there is updated CRTM code. If so, then CRTM code is copied into the L2 cache to be executed from there. The CRTM code loads the updated code into the cache and verifies its signature. The CRTM code then copies the updated code into the cache where the current CRTM code is located.

Systems and methods for maintaining CRTM code

The last value of an element of a computing system is continually stored within a first register. The element is cleared during any restart or reset of the computing system. The last value is relevant to debugging of the computing system when the computing system fails to perform as expected and/or as desired. Upon receiving an instruction to reset the computing system via a first reset signal corresponding to pressing of a reset button or a second reset signal corresponding to a baseboard management controller issuing a reset command, the last value of the element as stored within the first register is copied to a second register. The computing system is then reset. The last value of the element as stored within the second register persists within the second register during this type of reset, but is cleared during any other reset or restart of the computing system.

Growing community of inventors

Kenmore, WA, United States of America

Sean P Brogan