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mmastractoday at 3:21 PM2 repliesview on HN

Did the microcode disassembly find any useful backdoors to read microcode without decapping?


Replies

nand2mariotoday at 3:28 PM

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.

NooneAtAll3today at 6:26 PM

there are several iterations of 386 and only one was disassembled

so there's still a chance