mSGDMA Data Loss Between Descriptors (Streaming to Memory-Mapped)

We're experiencing consistent data loss when using Altera's mSGDMA IP on an Arria 10 device for streaming data from the FPGA fabric to DDR memory (accessible by the HPS).

Issue Description

• Data is being lost between consecutive descriptor transfers
• Typically missing ~80 bytes between transfers, occasionally less (~32 bytes)
• The data loss occurs even when multiple descriptors are queued in the descriptor FIFO
• The loss pattern seems somewhat consistent but not entirely predictable

System Configuration

• Arria 10 SoC with HPS running Yocto Linux (based on GSRD)
• mSGDMA Configuration:
  • Mode: Streaming to Memory-Mapped
  • Data width: 32-bit
  • Data FIFO depth: 1024
  • Descriptor FIFO depth: 128
  • Maximum burst count: 16
  • Maximum transfer length: 1024 bytes
  • Packet mode: Disabled
  • Prefetch: Disabled
  • Bus frequency: 200MHz (HPS running at 1GHz)

Additional Details

• We're using a driver based on https://github.com/pavelfpl/altera_msgdma_st
• The data source is a test logic that produces streams of consecutive 32-bit numbers
• The source pushes blocks of numbers once every few microseconds
• Data transfers are working but we're consistently losing data between descriptors
• No error bits are set in the status register after transfers
• We're not currently using packet mode, park reads, or prefetch features
  
  Has anyone encountered similar issues or have suggestions for what might be causing this data loss?
  
  
  Thanks for any insights.