C6678 internal exception

Any pointer about how to debug the issue further?

The address 0184 A280 is not defined in the CorePac users guide. The address 0184 A27Ch is the last Level 2 Memory Protection Page Attribute Register 31.

Hi Rajasekaran,

Thank you for the pointer. I looked at the thread in the BIOS forum. I get that the idea is to look at the memory map and the disassembly around the instruction where the exception happened.

I my case though, both NRP and IERR are 0. So, I cannot even roughly determine what section of code was executing before the exception was caught.

In addition to the register log, I do have the memory exception registers which DID catch something. So, lets see what we can determine from this data.

UMC_MPFSR 0x110
When set, indicates a supervisor write request. And Access was a "LOCAL" access.

UMC_MPFAR 0x184A280
The address 0x184A280 is not defined in the memory map of the C66 core pac users guide. So, it is quite odd that this address is recorded during the exception.
And the C6678 data sheet the memory map has it as a core pac register:
01800000 01BFFFFF 0 01800000 0 01BFFFFF 4M C66x CorePac Registers

Similarly,
DMC_MPFSR 0x120
When set, indicates a supervisor read request. And Access was a "LOCAL" access.

DMC_MPFAR 0x184A280
same unknown address.

The application leaves the memory protection configuration to the default values.
This exception happens after several hours of execution, not at bootup when I would expect some configuration code to setup registers normally.

The issue is also reproducible, and consistently points to same values in the exception registers log. So, the addresses are not random or a coincidence.

Register dump of another crash:
DEFAULT 1493: <<< Core 0 detected core 2 is in abort state with code 0x0
DEFAULT 1494: <<< Core 2 Abort Msg: ti.sysbios.family.c64p.Exception: line 248: .
DEFAULT 1495: <<< Core 2 Abort ArgsInfo: ; .
DEFAULT 1496: <<< Core 2 Register log: ERF 0x2 NRP 0x0 NTSR 0x1000C IERR 0x0 A31 0x10 A30 0xA1FF6C7C B31 0xB B30 0x0 ITSR 0x1000C IRP 0x0 SSR 0x0 AMR 0x0 ILC 0x2 RILC 0x0.
DEFAULT 1501: <<< Core 2 Register B[15-29]: 0x83EB68 0x3F 0xC1 0x264031C 0x1A8 0xA1FF5FC8 0x1F40 0xA1FF5FC8 0xA1FF5FF8 0x0 0xFEC0FEC0 0x0 0x0 0xBC8 0x881
DEFAULT 1499: <<< Core 2 Register A[15-29]: 0x0 0x3F 0xD4000000 0x0 0x0 0xD67 0x0 0xA1FF5FF8 0xCC 0xA1FF5FD8 0xA1FF5FE8 0xE34 0xC900C90 0xE34 0xE34
DEFAULT 1497: <<< Core 2 Memory Exception Regs: UMC_MPFAR 0x184A280 UMC_MPFSR 0x110 PMC_MPFAR 0x0 PMC_MPFSR 0x0 DMC_MPFAR 0x184A280 DMC_MPFSR 0x120
DEFAULT 1498: <<< Core 2 Register A[0-14]: 0x0 0x0 0x1 0x0 0x0 0xFFFFFFFF 0x0 0x82DAC4 0xD400FD58 0x20 0x2 0x5 0x0 0x0 0x0
DEFAULT 1500: <<< Core 2 Register B[0-14]: 0x0 0x1 0x0 0x1 0x0 0xFFFFFFFF 0x1 0x2 0x0 0x1 0x0 0x0 0xBFD7FF74 0x0 0x82DF78

Any new information? Can we close the thread?

Ran