Raptor Engineering makes/may eventually make(?) the "Talos Secure Workstation" based on POWER8. They claim "schematics and libre (fully open and auditable) fir

Raptor Engineering makes/may eventually make(?) the "Talos Secure Workstation" based on POWER8. They claim "schematics and libre (fully open and auditable) firmware also are included." Don't know; don't own one. A mere $5,300 gets/might get you an 8 core workstation. IBM makes POWER CPUs and you may assume that -- unless they've disclosed something -- no one other than IBM and the NSA really know if there are any unauditable "support" processors on the die. Beyond that the Raptor site mentions that there are still some bits you don't get to know about their system: "several pages will be redacted on the public schematic due to mandatory NDAs with a few of our support silicon vendors." Everything else is SOC/MCU stuff; nothing that approaches the capabilities of these Intel and AMD CPUs. You could hold out on older pre-ME/PSP systems until RISC-V goes through enough evolution and market success to achieve parity with then-contemporary devices, sometime around 2035 I'd guess... Answer to your question is, in most cases, simply no.