Intel Agilex® 7 Hard Processor System Remote System Update User Guide

ID 683184
Date 6/09/2023
Public

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7.3.4. Fallback on Flash Corruption of Application Images

This section uses U-Boot to demonstrate falling back in case of configuration errors caused by flash corruption of application images.
Note: The commands listed in this section rely on the commands from the Basic Operation section running first, specifically adding an application image to the P2 flash partition.
  1. Power-cycle the board, stop U-Boot and check the RSU status log:
    SOCFPGA # rsu status_log
    Current Image   : 0x02000000
    Last Fail Image : 0x00000000
    State           : 0x00000000
    Version         : 0x00000202
    Error location  : 0x00000000
    Error details   : 0x00000000
    Retry counter   : 0x00000000

    The application image from slot 1 (partition P2) was loaded, because it is marked as the highest priority in the CPB.

    What do the fields mean:
    • Retry counter is 0x00000000 —first attempt to load this image.
    • State is 0x00000000 —No errors to report
  2. Corrupt the image in the slot 1 by erasing some of it:
    SOCFPGA # sf probe
    SF: Detected mt25qu02g with page size 256 Bytes, erase size 4 KiB, total 256 MiB
    SOCFPGA # sf erase 0x02000000 0x4000
    SF: 16384 bytes @ 0x2000000 Erased: OK
  3. Power cycle the board, stop at U-Boot prompt, and query the RSU log:
    SOCFPGA # rsu status_log
    Current Image   : 0x01000000
    Last Fail Image : 0x02000000
    State           : 0xf004d003
    Version         : 0x0dcf0202
    Error location  : 0x00000000
    Error details   : 0x00000000
    Retry counter   : 0x00000000

    The current image is P1, and the P2 shows as a failure. Note that SDM tried to load the image three times from flash, as specified by the max retry option. The top 16 bits of the version field are set as 0x0DCF which means the error was caused reported by the decision firmware, as it was not able to load the image. The top 16 bits of the state field are set to 0xF004, which indicate an internal error. For more information, refer to RSU Status and Error Codes .

  4. Clear the error status and display the log again to confirm it was cleared:
    SOCFPGA # rsu clear_error_status
    SOCFPGA # rsu status_log
    Current Image   : 0x01000000
    Last Fail Image : 0x00000000
    State           : 0x00000000
    Version         : 0x00000202
    Error location  : 0x00000000
    Error details   : 0x00000000
    Retry counter   : 0x00000000