Arria® V SX and ST SoC Errata

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ID 683370
Date 7/14/2015
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Document Table of Contents
Document Table of Contents x
1. Arria® V SX and ST SoC Errata
1. Arria® V SX and ST SoC Errata x
1.1. Altera-Specific SoC Errata for Arria® V SX and ST Devices 1.2. Arm* Cortex* -A9 MPCore* and L2 Cache Errata 1.3. Revision History for Arria® V SX and ST SoC Errata
1.1. Altera-Specific SoC Errata for Arria® V SX and ST Devices x
1.1.1. Hard Processor System (HPS) 1.1.2. FPGA
1.1.1. Hard Processor System (HPS) x
1.1.1.1. EMAC RMII PHY Interface is Only Supported Through the FPGA Fabric 1.1.1.2. Hard Processor System Level 2 Cache Error Correction Code 1.1.1.3. Hard Processor System PLL Lock Issue After Power-on Reset or Cold Reset 1.1.1.4. HPS TAP Controller Is Reset By Cold Reset 1.1.1.5. SPI Slave Output Signals Cannot Be Isolated When Routed to the HPS Pins
1.1.2. FPGA x
1.1.2.1. False Configuration Failure in Active Serial Multi-Device Configurations
1.2. Arm* Cortex* -A9 MPCore* and L2 Cache Errata x
1.2.1. Arm* Cortex* -A9 MPU 1.2.2. Arm* L2 Cache Controller 1.2.3. Arm* CoreSight PTM
1.2.1. Arm* Cortex* -A9 MPU x
1.2.1.1. 761319: Ordering of Read Accesses to the Same Memory Location Might Be Uncertain 1.2.1.2. 775420: Particular Data Cache Maintenance Operation Which Aborts Might Lead to Deadlock 1.2.1.3. 782772: Speculative Execution of LDREX or STREX Instruction After a Write to Strongly Ordered Memory Might Lead to Deadlock 1.2.1.4. 761320: Full Cache Line Writes to the Same Memory Region From Both Processors Might Cause Deadlock 1.2.1.5. 845369: Under Very Rare Timing Circumstances Transition into Streaming Mode Might Create Data Corruption 1.2.1.6. 740657: Global Timer Can Send Two Interrupts for the Same Event 1.2.1.7. 751476: Missed Watchpoint on the Second Part of an Unaligned Access Crossing a Page Boundary 1.2.1.8. 754322: Faulty MMU Translations Following ASID Switch 1.2.1.9. 764369: Data or Unified Cache Line Maintenance by MVA Fails on Inner-Shareable Memory 1.2.1.10. 782773: Updating a Translation Entry to Move a Page Mapping Might Erroneously Cause an Unexpected Translation Fault 1.2.1.11. 794072: A Short Loop Including DMB Instruction Might Cause a Denial of Service When the Other Processor Executes a CP15 Broadcast Operation 1.2.1.12. 794073: Speculative Instruction Fetches with MMU Disabled Might Not Comply with Architectural Requirements 1.2.1.13. 794074: A Write Request to an Uncacheable, Shareable Normal Memory Region Might be Executed Twice, Possibly Causing a Software Synchronization Issue 1.2.1.14. 725631: ISB is Counted in Performance Monitor Events 0x0C and 0x0D 1.2.1.15. 729817: MainID Register Alias Addresses Are Not Mapped on Debug APB Interface 1.2.1.16. 729818: In Debug State, the Next Instruction is Stalled When the SDABORT Flag is Set Instead of Being Discarded 1.2.1.17. 751471: DBGPCSR Format Is Incorrect Description Impact Workaround Category 1.2.1.18. 752519: An Imprecise Abort Might Be Reported Twice on Non-Cacheable Reads 1.2.1.19. 754323: Repeated Store in the Same Cache Line Might Delay the Visibility of the Store 1.2.1.20. 756421: Sticky Pipeline Advance Bit Cannot be Cleared from Debug APB Accesses 1.2.1.21. 757119: Some Unallocated Memory Hint Instructions Generate an UNDEFINED Exception Instead of Being Treated as a NOP 1.2.1.22. 761321: MRC and MCR Are Not Counted in Event 0x68 1.2.1.23. 764319: Read Accesses to DBGPRSR and DBGPRCR May Generate an Unexpected UNDEF 1.2.1.24. 771221: PLD Instructions Might Allocate Data in the Data Cache Regardless of the Cache Enable Bit Value 1.2.1.25. 771224: Visibility of Debug Enable Access Rights to Enable/Disable Tracking is Not Ensured by an ISB 1.2.1.26. 771225: Speculative Cacheable Reads to Aborting Memory Regions Clear the Internal Exclusive Monitor and May Lead to Livelock 1.2.1.27. 775419: PMU Event 0x0A Might Count Twice the LDM PC ^ Instruction with Base Address Register Write-Back 1.2.1.28. 782774: A Spurious Event 0x63 Can be Reported on an LDREX That is preceded by a Write to Strongly Ordered Memory Region
1.2.2. Arm* L2 Cache Controller x
1.2.2.1. 754670: A Continuous Write Flow Can Stall a Read Targeting the Same Memory Area 1.2.2.2. 765569: Prefetcher Can Cross 4 KB Boundary if Offset is Programmed with Value 23 1.2.2.3. 729815: The High Priority for SO and Dev Reads Feature Can Cause Quality of Service Issues to Cacheable Read Transactions
1.2.3. Arm* CoreSight PTM x
1.2.3.1. 720107: Periodic Synchronization Can Be Delayed and Cause Overflow 1.2.3.2. 711668: Configuration Extension Register Has Wrong Value Status
1. Arria® V SX and ST SoC Errata

1.2.1.17. 751471: DBGPCSR Format Is Incorrect

Description

In the Debug Program Counter Sampling (DBGPCSR) register, the Arm* architecture specifies that:

  • DBGPCSR[31:2] contain the sampled value of bits [31:2] of the PC.
  • The sampled value is an instruction address plus an offset that depends on the processor instruction set state.
  • DBGPCSR[1:0] contain the meaning of PC Sample Value, with the following permitted values:
    • 2'b00 ((DBGPCSR[31:2] << 2) – 8) references an Arm* state instruction
    • 2'bx1 ((DBGPCSR[31:1] << 1) – 4) references a Thumb or ThumbEE state instruction; "x" is a don't care.
    • 2'b10 IMPLEMENTATION DEFINED

This field encodes the processor instruction set state, so that the profiling tool can calculate the true instruction address by subtracting the appropriate offset from the value sampled in bits [31:2] of the register.

In Cortex* -A9, the DBGPCSR samples the target address of executed branches (but possibly still speculative to data aborts), with the following encodings:

  • DBGPCSR[31:2] contain the address of the target branch instruction, with no offset.
  • DBGPCSR[1:0] contains the execution state of the target branch instruction:
    • 2'b00 for an Arm* state instruction
    • 2'b01 for a Thumb state instruction
    • 2'b10 for a Jazelle state instruction
    • 2'b11 for a ThumbEE state instruction

Impact

The implication of this erratum is that the debugger tools must not rely on the architected description for the value of DBGPCSR[1:0], nor remove any offset from DBGPCSR[31:2], to obtain the expected PC value.

Subtracting 4 or 8 from the DBGPCSR[31:2] value would lead to an area of code that is unlikely to have been recently executed or might not contain any executable code.

The same might be true for Thumb instructions at half-word boundaries, in which case, PC[1]=1 but DBGPCSR[1]=0; or ThumbEE instructions at word boundaries, with PC[1]=0 and DBGPCSR[1]=1. In Cortex* -A9, because the DBGPCSR is always a branch target (in other words, the start of a basic block to the tool), the debugger should be able to spot many of these cases and attribute the sample to the right basic block.

Workaround

The debugger tools can find the expected PC value and instruction state by reading the DBGPCSR register and consider it as described in the "Description" section of this erratum.

Category

Category 3

Level Two Title