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by jtl999
1951 days ago
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> This all makes me think there is some other microcontroller somewhere that controls the bios flashback process, which would almost certainly be an extra chip. I believe they just have some sort of extra microcontroller wired to a USB port and the SPI flash chip that stores the BIOS, probably with some sort of switch to ensure the host can't touch the SPI flash when the external microcontroller is attempting to flash it. |
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