Modern PC will disable any debug IO interface when production to avoid hacker
attacks. The existing way used for BIOS debugging is using two-byte non-volatile memory
to record POST (Power On Self-Test) code for identifying high level BIOS driver error.
However, this debug method can’t help first triage the issue when bringing up from
For helping to shorten the debugging period and save the service cost, we introduce the
dual post code design idea.
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INC, HP, "DUAL POST CODE DESIGN", Technical Disclosure Commons, (November 15, 2021)