Minor MIPS tree pruning

[Brooks Davis]

On Sat, Dec 30, 2017 at 11:44:20AM -0500, Alexander Kabaev wrote:
> On Sat, 30 Dec 2017 01:10:11 -0700
> Warner Losh <imp at bsdimp.com> wrote:
> 
> > I'd like to propose that we eliminate support for the following
> > before the FreeBSD 12 branch.
> > 
> > adm5120 (most boards don't have enough memory, very old)
> > alchemy (the au1xxxx port never really was finished, and boards lack
> > memory, very old)
> > idt (only a few boards worked, most are long obsolete)
> > rt305x (raylink kit is now out dated, at least I think so)
> > sibyte (long obsolete, hard to get hardware)
> > 
> > I thought I'd post a heads up here before I proposed this list to
> > arch at .
> > 
> > We have enough exemplars these days we don't need to keep these older
> > ports around as examples anymore, and I have my doubts if we even
> > work on these boards anymore.
> > 
> > If I'm wrong about these being old, or that FreeBSD is no longer
> > running on them, please let me know. Thanks!
> 
> RMI is another one that should get on chopping block, IMHO. They are
> impossible to track down in the wild and files were not touched more or
> less ever since being committed. They also re-implement too much of the
> code in MI and chances of FreeBSD-current working on the hardware are
> very, very slim.

Deleting that would clean up a fair number of ifdefs in MIPS MD code.

-- Brooks
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