![]() ![]() ![]() NoteDesktop users whose motherboard contains a socketed DIP-8 chip, may use a solderless breadboard to hold the flash chip while programming. If you are unsure which type you need, see the next step. ![]() NoteOther brands of IC clip are available, but Pomona is arguably the best known, and their model numbers often quoted by 'compatibles'. However, for the sake of concreteness, I will assume you are using the specified (RPi3 or RPi4) system in what follows. ![]() You can also use the RPi3/4 in 32-bit mode, and it is also possible to use earlier versions of the RPi. NoteNote that there are many other SBCs that may be used for in-system flash reprogramming, for example the BeagleBone. Note however that you should be able to use me_cleaner's -s/-soft-disable-only option even if Boot Guard is in use on your system. By definition, Boot Guard cannot be active on systems where the motherboard and CPU are purchased separately, and at the time of writing only a minority of laptop systems have it active. It was introduced in the 4th generation (Haswell) architecture. NoteIntel systems that have Boot Guard enabled cannot be fully 'cleansed' - this technology stores a public verification key for the vendor's (signed) firmware images in one-time-programmable fuses in the CPU, and utilises the ME to verify these. NoteAMD-CPU-based systems do not have the IME of course, but do have a broadly equivalent subsystem, the platform security processor (or 'PSP'), for which there is no equivalent workaround at the time of writing. From Gentoo Wiki = 8GB microSD card (to hold the 64-bit Gentoo O/S image we will use for the RPi3/4) an appropriate IC clip for your target PC's flash chip, e.g.: a Pomona 5250 for SOIC-8 chips a Pomona 5208 for unsocketed DIP-8 chips, or a Pomona 5252 for SOIC-16 chips 8 female-female connector wires (to attach the appropriate clip to the RPi3/4's GPIO header) a maintenance manual for your target PC, where available, to assist in safe disassembly / reassembly and whatever tools are stipulated in the above. ![]()
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