r343567 aka PAE vs non-PAE merge breaks i386 freebsd

[John Baldwin]

On 2/28/19 11:14 AM, Cy Schubert wrote:
> On February 28, 2019 11:06:46 AM PST, Conrad Meyer <cem at freebsd.org> wrote:
>> On Thu, Feb 28, 2019 at 10:32 AM Steve Kargl
>> <sgk at troutmask.apl.washington.edu> wrote:
>>> This is interesting as well.  Does this mean that amd64 is now
>>> the only tier 1 platform and all other architectures are after
>>> thoughts?
>>
>> This has been the de facto truth for years.  i386 is mostly only
>> supported by virtue of sharing code with amd64.  There are efforts to
>> promote arm64 to Tier 1, but it isn't there yet.  Power8+ might be
>> another good alternative Tier 1 candidate eventually.  None have
>> anything like the developer popularity that amd64 enjoys.
>>
>> Conrad
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> 
> We deprecated and removed support for 386 and 486 processors. We should consider removing support for low end Pentium as well. I'm specifically thinking of removing the workarounds like F00F. Are there any processors that are still vulnerable to this?

We have only removed support for 386 since it didn't support cmpxchg.  We still
nominally support 486s.  I don't know how well FreeBSD 13 would run on a 486, but
in theory the code is still there and the binaries shouldn't die with illegal
instruction faults.

-- 
John Baldwin