[TF-A] BERT Record Erase Only After Kernel Consumes

Hi All,

BERT (Boot Error Record Table) captures errors which occurred in previous boot. Below is the Flow with FFH (firmware first handling)

1. Kernel is running 2. Fatal error happens, which requires reboot 3. Firmware decides to reboot system, before that capture current snapshot and save it as bert record on non-volatile memory 4. System reboot 5. On next boot, firmware read bert record from non-volatile memory 6. Copy bert record to ghes dram buffer 7. Kernel boots 8. Kernel reads ghes dram buffer and prints bert record.

Problem in this flow is "When firmware should erase or delete bert records from non-volatile memory"?

Ideally, when Kernel has consumed Bert record after that only firmware should erase them from non-volatile memory. But there is no communication from Kernel to firmware that it has consume bert record and now it is safe to erase them.

Is there already a solution for this problem available in Kernel or firmware? Can generic SMC call from Kernel to firmware be a solution? Any other suggestion?

Thanks

Regards, Jaiprakash