[coreboot] Dont filter supported CPUs on a mainboard by the CPUID

[Timothy Pearson]

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On 02/22/2017 05:07 PM, i1w5d7gf38keg at tutanota.com wrote:
>  There is a Filter to stop booting when the CPUID is not in a list of
> supported CPUs. This filter does not make sense in the real world usage.
> For example socket 775:
> When you enter a working cpu, then it boots.  In some cases the coreboot
> code didnt work with a CPU where it should. For example some Pentium-4
> CPUs. Then it crashes even before raminit.
> But when you add a CPU that "would" work but is not listed in the CPUID
> lists from coreboot, the machine didnt boot. If you simply add the CPUID
> to the list everything works fine.
> 
> In short: The only thing this CPUID list is doing is blocking
> functionality and adding work (a list that have to be maintained).
> Nothing else. If a CPU is not supported, it crashes after 4-5 lines of
> logfile - even before the raminit. Thats before this CPUID list is been
> checked.
> 
> Please remove those CPUID lists.
> 

I would recommend the lists be retained.  Presumably the individual(s)
that wrote the CPU / northbridge support code are aware of the CPUs that
the code is designed to work with, and using CPUs that were never
intended with that code does entail a certain amount of risk.
Individuals capable of mitigating this risk / verifying processor
functionality are also capable of modifying the CPUID list.

- -- 
Timothy Pearson
Raptor Engineering
+1 (415) 727-8645 (direct line)
+1 (512) 690-0200 (switchboard)
https://www.raptorengineering.com
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