0xFFFF000C indicated that Prefetch Abort occurred. Please kindly refer to below KBA for further analysis.
2. For un-correctable ECC error, please ensure continuous 64bit data was written to concerned address with 32bit write commands as TCFlash use 64-bit ECC.
Please kindly provide more information about the issue to your Cypress contact window (CY FAE/FSE) to do further analysis.