![]() Bad firmware checks for a specific processor model number and halts if it is not an exact match. Good firmware checks the processor family, and if it actually has specific code for multiple families, chooses the appropriate branch. When a firmware starts running one of the first things it does is calls CPUID (op code 0F A2). In some cases ( Dell) this is intentional. Processor compatibility is limited by badly written firmware. New processors models for any socket are always made fully compatible with older hardware. Besides, the operating system loads a newer version of microcodes anyway.Įxperience shows that adding microcodes to Mac firmware will make the system less likely to boot. No processor sold should need microcodes to boot. ![]() ![]() People erroneously think that upgrading a firmware's set of microcodes will make the computer support newer processors. ![]()
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