Ensuring System Integrity through Advanced System Software Verification
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1 Mike Bartley, TVS Ensuring System Integrity through Advanced System Software Verification Test and Verification Solutions Helping companies develop products that are: Reliable, Safe and Secure
2 Our Opportunities and Challenges Making our driving experience Safer, more comfortable, more efficient Electronics in automotive is set to rise at 19% per annum for the next 5 years e-calls in Europe from 2015 Demonstrating compliance to ISO26262 System Complexity impacting Software V&V Copyright TVS Limited Private & Confidential Page 2
3 Agenda About TVS Applying Hardware Verification Techniques in Software Testing? Constrained random techniques Functional Coverage Assertion-based checking Compliance to ISO26262 Requirements-Driven Test and Verification Shift-left How to get involved! Copyright TVS Limited Private & Confidential Page 3
4 About TVS Focused on HW verif and SW test Services Products 130 engineers world wide Trusted by wide range of clients and partners Delivering T&V Solutions since 2008 Helping companies develop products that are: Reliable, Safe and Secure Copyright TVS Limited Private & Confidential Page 4
5 The mechanics of an advanced test bench Test Functional Coverage Coverage Checker Monitor constraint addr data Assertions Stimulus generator Driver Design Under Test assert Coverage Active Passive Code Coverage Copyright TVS Limited Private & Confidential Page 5
6 Some hardware verification examples CPU Verification Instruction Stream Generator assembler CPU RTL CPU C Model Compare Accuracy? Copyright TVS Limited Private & Confidential Page 6
7 Some hardware verification examples USB Verification Assertions Assertions Coverage Assertions Coverage Coverage Packet Generator Driver DUT Response Scoreboard Copyright TVS Limited Private & Confidential Page 7
8 Results of Bubble Sort Proof of Concept Lists of Integers Floats Ascii etc List Generator Check output list is ordered Output list contents == input list contents Checkers Software Under Test Lists Constrain towards Empty lists Equal values Reverse ordering Coverage Metrics Empty List Reverse ordered Error cases (mix integers, floats, ascii etc Copyright TVS Limited Private & Confidential Page 8
9 Virtual System Level Test Environment Checkers Logfiles Event Stream Generator Sensor Inputs Software Under Test Actuator Outputs Metrics Copyright TVS Limited Private & Confidential Page 9
10 Virtual System Level Checkers Assert never do anything wrong Always fail safe Assert always respond correctly If A&B&C occur then check X happens Assertion coverage check A&B&C occurs for free Analyse log files Look for anomalies Did the actuator outputs occur in the correct order Copyright TVS Limited Private & Confidential Page 10
11 Functional Coverage Requirements coverage Cross-product coverage Situation coverage [R Alexander et al. Situation coverage a coverage criterion for testing autonomous robots. University of York, 2015] From Kerstin Eder of the University of Bristol [O Lachish, E Marcus, S Ur and A Ziv. Hole Analysis for Functional Coverage Data. Design Automation Conference (DAC), June 10-14, 2002, New Orleans, Louisiana, USA.] A cross-product coverage model is composed of the following parts: 1. A semantic description of the model (story) 2. A list of the attributes mentioned in the story 3. A set of all the possible values for each attribute (the attribute value domains) 4. A list of restrictions on the legal combinations in the cross-product of attribute values A functional coverage space is defined as the Cartesian product over the attribute value domains. 12 Copyright TVS Limited Private & Confidential Page 12
12 ISO26262 compliance (asuresign) Managing Requirements Importing and editing requirements Decomposing requirements to verification goals Tracking test execution Automating import of test results Automate accumulation and aggregation of test results Impact analysis Managing changes in requirements and tests Demonstrating compliance to DO254 & DO178C Managing multiple projects Copyright TVS Limited Private & Confidential Page 13
13 Decomposing requirements to features and tests Import Requirements (Doors, Excel, Word, etc) Map requirements to verification goals Edit Requirements The mapped verification goal Sign off a requirement with a manual test (e.g. in the lab) Copyright TVS Limited Private & Confidential Page 14
14 ISO26262 compliance (asuresign) Managing Requirements Importing and editing requirements Decomposing requirements to verification goals Tracking test execution Automating import of test results Automate accumulation and aggregation of test results Impact analysis Managing changes in requirements and tests Demonstrating compliance to DO254 & DO178C Managing multiple projects Copyright TVS Limited Private & Confidential Page 15
15 Tracking test execution: Automating import of test results Accellera standard asuresign UCIS XML API Hardware Verification Results Software Test Tools Hardware Simulation Formal Verification Manual Entry Manual Testing Copyright TVS Limited Private & Confidential Page 16
16 Automate accumulation and aggregation of test results Aggregate results through the hierarchy Accumulate results over multiple regressions Record results from each test Define and track against interim milestones (based on % of requirements tested) Copyright TVS Limited Private & Confidential Page 17
17 ISO26262 compliance (asuresign) Managing Requirements Importing and editing requirements Decomposing requirements to verification goals Tracking test execution Automating import of test results Automate accumulation and aggregation of test results Impact analysis Managing changes in requirements and tests Demonstrating safety compliance for example DO254/178C, ISO26262, IEC 60601, IEC 61508, EN 50128, IEC Managing multiple projects Copyright TVS Limited Private & Confidential Page 18
18 Demonstrating compliance to DO254 & DO178C Export XML for import back into Doors, etc. Export PDF report for audit Select level of detail Pid = unique reference to requirement in external tool Export Metadata such as Tool version numbers Configuration data Data owners Copyright TVS Limited Private & Confidential Page 19
19 See the T&V status of multiple projects asure asure SIGN SIGN asure asure SIGN SIGN Multiple Projects in a Single View Aggregate data at different levels of hierarchy Copyright TVS Limited Private & Confidential Page 20
20 Model-based test generation From Kerstin Eder of the University of Bristol Formal model Traces from model checking Test template Test components: - High-level actions - Parameter instantiation System + environment Environment to drive system 21 Copyright TVS Limited Private & Confidential Page 21
21 Conclusions The market opportunity is there But there are barriers to entry! Demonstrating compliance to ISO26262 System Complexity impacting Software V&V TVS Solutions Requirements Driven Test and Verification PROVEN asuresign PROVEN Constraint-driven testing with functional coverage & assertions Hardware PROVEN Software partially PROVEN, working with partners Get Involved Copyright TVS Limited Private & Confidential Page 22
22 Contact details Mike Bartley Come to the stand! Copyright TVS Limited Private & Confidential Page 23
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