So, there will be PCIE-8 connectors for 12vdc to the main board but does the Beaglebone take 5vdc? Is there a 12v-5v switching down converter onboard or will the Beaglebone always require a separate 5vdc supply? I can see how one might first apply the 5vdc, login, configure the miner, then fire up the 12vdc but an onboard converter would preclude two PSUs given the device can already have been configured.
You're questioning whether an engineering team with proven designs is going to forget to put a voltage regulator in place so a daughterboard can handle lower voltages?
Seriously?
The question came to mind seeing the Beaglebone PSU connector. About your tone....
I wasn't trying to be rude, I just look at it differently. My take is to simplify things, they would have an onboard power source for the BB.
Another valid engineering perspective would be 'to make it less expensively, let's not have an onboard power source for the BB.'
The cost of a DC:DC regulator, especially by the reel, is on the order of pennies, or fractions of a penny depending on what you get. They already said the only power connections to be made will be PCIE. They're going with a KIS method for this. Plugging up an extra power cord adds complexity and time, especially for rig-testing. I'd wager they're willing to spend the .005 cents on the PCB components for onboard power.
It's obvious you have never worked on a design for mass production. Eliminating a DC-DC regulator and associated circuitry would typically be considered a massive win for manufacturing.
No I haven't worked an electronics assembly line, nor have I managed an electronics-production line, nor have I done large scale electronics design. I have overseen mass distribution though. I have designed circuitry. These guys make it a business to do the same, and from what hints they've dropped, they appear to have gone the route I suspect.
Again as mentioned previously, their profit margin is well over 50%, likely 70% for these units. They're not too worried about their cost. They already have the boards, and are tested. This eliminates production time as a factor for delivery. They stated the only power connections would be PCIE. This hints there will be on board regulation.
So whether I've worked or designed as you propose is moot, especially if my understanding of their hints is correct.