Comment on z386: An Open-Source 80386 Built Around Original MicrocodeComments−mmastrac3moDid the microcode disassembly find any useful backdoors to read microcode without decapping?−nand2mario3moNot really. The 386 does not have an interface to read the ROM direclty. Instead, it uses the Built-In Self-Test (BIST) to verify the ROM's contents. It's basically a checksum-like mechanism that verify the integrity of the CROM.−NooneAtAll33mothere are several iterations of 386 and only one was disassembledso there's still a chance
Comments
Did the microcode disassembly find any useful backdoors to read microcode without decapping?
Not really. The 386 does not have an interface to read the ROM direclty. Instead, it uses the Built-In Self-Test (BIST) to verify the ROM's contents. It's basically a checksum-like mechanism that verify the integrity of the CROM.
there are several iterations of 386 and only one was disassembled
so there's still a chance