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Read Permissions for Queue Manager Subsystem

SThakkar
Intellectual 470 points

Hi,

My application running on 6678 crashes sometimes. I found that the MPU2 has detected an error:

The MPU2 is for QMSS CFG port. And the address detected also falls in that range. I am not sure how I can address the issue.

I came across an usage note (#8) in the 6678 silicon errata which is:

Usage Note 8 MPU Read Permissions for Queue Manager Subsystem Usage Note

For proper device

operation, all of the read permissions for the VBUSM slave port of the QMSS must be

enabled. '

I did not find too much information about VBUSM slave port in the documentation either. Please let me know how I can make sure my configuration is correct.

Thanks!

  • 0
    TI__Genius 12065 points

    You can find clues in the MPU2 Fault Status Register value (0x0E080010), bits field [5:0] is 10000b which means "Supervisor Write Fault" is the cause of this access error based on the description in MPU user guide. And bit field [23:16] is 0x8, so master AID 0x8 (CPU0_CFG) is the master which generates this Supervisor write fault.

    Then if you look at the PROGn_MPPA register value (0x03FFFCE4), bit field 4 "Supervisor Write Permission" is 0b which means "Access not Allowed". And you enabled AID 0x8 in MPPA (bit 18) to check for access permission. 

    So probably you should set 1 to "Supervisor Write Permission" bit in PROGn_MPPA register(s) to enable the access for all AIDs which are enabled.