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<p>
Unlike x86 (e.g. Intel/AMD) CPUs, ARM CPUs do not use microcode, not even built in.
On the Intel/AMD based libreboot systems, there is still microcode in the CPU
- (not considered problematic by the FSF, since it's part of the hardware), but we
- exclude microcode updates, which are proprietary software.
+ (not considered problematic by the FSF, since it's part of the hardware and read-only), but we
+ exclude microcode updates (volatile updates which are uploaded at boot time by the boot firmware,
+ if present), which are proprietary software.
</p>
<p>
On ARM CPUs, the instruction set is implemented in circuitry, without microcode.