Revision(s) Affected:

AWR1642 ES1.0 and AWR1642 ES2.0

Description:

The CR4 processor may perform an invalid pre-fetch access due to speculative TCM read leading to an invalid address access. This can result in a TCERROR and also a 2-bit ECC fatal error. The TCERROR is ignored by the processor since these correspond to instructions that are pre-fetched but never executed. However, the invalid MSS_TCMA_FATAL_ERR is generated on the ESM group3 channel-7.

Implication: In case of a genuine TCMA ECC fatal error, nERROR will not be generated directly through ESM.

Workaround(s):

Mask Group 3 channel 7: MSS_TCMA_FATAL_ERR to ESM can be masked by writing into MSS_RCM:ESMGATE0 register. CR4F abort handler should handle the nERROR generation

OR

Disable branch prediction for MSS-CR4F