Remote BoundaryScan System Test Control for the ATCA

Remote Boundary-Scan System Test Control for the ATCA Standard Gunnar Carlsson 1, David Bäckström 2 , Erik Larsson 2 1) Ericsson Radio Network Development Sweden ITC 2005 2) Linköpings Universitet Department of Computer Science Sweden Slide 1

Outline Remote Boundary-Scan System Test Control for the ATCA Standard q. Introduction q. System Environment q. Approach q. Demonstration Board q. Conclusions ITC 2005 Slide 2

Introduction Boundary Scan in Modern Systems q. Boundary Scan (BScan) not only used for production interconnect test of boards q. In multiboard systems the test controller and the target devices may be located on different boards q. How to link BScan between controller and target devices? q. Natural solution: BScan control and data must be routed through backplane ITC 2005 Slide 3

Introduction Multiboard Systems Backplane Application specific boards Shelf Management Board ITC 2005 Slide 4

Introduction BScan Multidrop Boundary Scan Control Path Central Processor Local Processor System Management ITC 2005 Local Processor System BScan Master/Slave Local BScan Master/Slave A T E Local Processor Application Boards Slide 5

Introduction Related Work q. Several commercial solutions exist how to link BScan in a backplane environment q. National Semiconductor: SCAN Bridge § Based upon: [D. Bhavsar, ITC´ 91] § Addressing boards and modules by using the instruction scan q. Texas instruments: Addressable Shadow Port (ASP) § [L. Whetsel, ITC´ 92] § Added shadow protocol used to access boards and modules ITC 2005 Slide 6

Introduction Problem Definition q. However, some system architectures do not include BScan in the backplane q. The emerging ATCA standard is an example, which will be increasingly deployed q. The purpose of this project is to find a way to manage remote BScan control in ATCA based systems ITC 2005 Slide 7

System Environment ATCA Overview q. Advanced Telecommunications Computing Architecture (ATCA) q. Contain design specifications and requirements in the following areas: § § § ITC 2005 Mechanical and Dimensions Power Distribution Thermal Dissipation Interfacing and Interconnections System Management Slide 8

System Environment System Management (IPMI) q. Intelligent Platform Management Interface (IPMI) q. Exposing HW management functions to OS and Management SW q. Provides interface and communications for: § Monitoring and Logging § Inventory § Recovery Control q. Allows implementation of additional management applications within the IPMI framework ITC 2005 Slide 9

System Environment System Management (IPMI) Management Bus (IPMB) Management SW/OS SM BMC Shelf Management Board Application Board SM = Shelf Manager BMC = Baseboard Management Controller ITC 2005 Slide 10

Payload FRU LEDs BMC to scale Payload Interface Temperature Sensor Synch & Clock I/F Update Channel I/F Bussed E-Keying Enables 15 Point-to-Point E-Keying Enables BMC Controller Blue LED Enable Bussed E-Keying Enables IPMB-0 Buffers Hardware Address [7: 0] Power Supply Monitoring Payload Power Enable Handle Switch Management Power ITC 2005 Fabric I/F 1 1 16 DC/DC Converter Monitor/ Controller Base I/F Metallic Test Bus IPMB-0 Hardware Address Dual – 48 V Power Slide 11

System Environment Management Bus (IPMB) q. Intelligent Platform Management Bus (IPMB) q. Based on the two wire serial I 2 C Bus § Data transfers up to: 100 kbit/s § Maximum message size: 32 bytes q. All IPMI messaging, including IPMB, uses a request/response protocol § All IPMB requests must be answered with an IPMB response § Requests and Responses are not automatically paired ITC 2005 Slide 12

Approach Project Goals q. Propose a way to transport BScan data and control using the IPMB q. Propose means how to manage embedded tests in IPMI q. The solution should fit in the ATCA/IPMI context q. Build a demonstration board to validate the proposed solution ITC 2005 Slide 13

Approach New Functionality in IPMI IPMB Operator/ Test Program SM BMC Memory Shelf Management Board ITC 2005 Components under test Application Board Slide 14

Approach Commands and Data Format q. Command set to interface and control the onboard tests: § Test management commands: o LIST, SEND, RECEIVE, DELETE § Test execution commands: o RUN § Test setup commands: o LINK, OPTIONS q. Embedded test data format § National Semiconductor EVF is an example § Based on the Serial Vector Format (SVF) ITC 2005 Slide 15

Approach Transport of BScan Control and Data q. IPMB designed to carry short control and status messages q. Extended the IPMB protocol to enable transport of BScan control and data § Still follows the rules and requirements set by the standard IPMB protocol § The SM unit is the requester (master) and the BMC units are the responders (slaves) § Mechanisms for dividing larger test files into smaller IPMB packages and reassembling of packages back into test files has been specified and implemented ITC 2005 Slide 16

Approach Transport of BScan Control and Data q. Transport times of a 77 k. B EVF file on IPMB Description Standard IPMB restrictions Increased max packet size Fast I 2 C mode I 2 C High speed mode and Increased max packet size ITC 2005 Max. packet size I 2 C Speed Total transport time Po + P d S T 3 32 B 64 B 100 kbit/s 400 kbit/s 3. 4 Mbit/s 11. 7 s 8. 44 s 2. 94 s 0. 35 s 0. 25 s Slide 17

Demonstration Board Operator Interface SM Shelf Manager Board ITC 2005 Operator Interface IPMB Backplane SM BMC UUT BSC Application Board Slide 18

Demonstration Board Operators interface UUT SM-unit BMC-unit BScan controller ITC 2005 Slide 19

Conclusions q. Easy to add BScan functionality to the ATCA/IPMI context q. IPMB suitable to carry BScan control and status q. IPMB less suitable to carry large tests due to the limitations of the standard. q. Can be solved using the higher available I 2 C data transfer speeds and larger IPMB packet sizes ITC 2005 Slide 20