🚀 go-pugleaf

>[9] Built In Self Test ( Built In Test Equipment )
>
>Each board should have BIST (BITE) features. The bus should be
>involved: the system should be able to force a board into BIST mode.
>This also puts the board's interface into BI mode, so that boards
>which temporarily/permanently aren't useful, won't be called upon.
>There is a question as to how a board comes back out of BIST mode,
>depending on why it went in, and what the result was. Also, if the
>board has failed, how much can the system find out about the failure.

Don't oblige potentially expensive features.
Encourage them. Support them.
But do not oblige boards to support a complicated BIST protocol.
I've seen boards spend a lot of logic supporting a BIST interface,
only to have no test hardware at all. The BIST interface could have
been used more productively on more basic things, like ECC.

Put another way: accept "No" responses to external BIST requests.
A simple No.
Not a No that needs to be bundled in some complicated packedt and returned.