Robert covered this last month  search list

On 2/23/2018 8:14 AM, Dennis Lee Bieber wrote:
> On Fri, 23 Feb 2018 03:27:35 -0800 (PST),
> declaimed the following:
>> Hello,
>> I installed  the following image on a BBB version 5AC: 
>> *microSD/Standalone: (stretch-iot) (All BeagleBone Variants & PocketBeagle) 
>> **bone-debian-9.3-iot-armhf-2018-02-18-4gb*
>       <SNIP>
>> The problem is that it has to be repeated (button pushed) after a power 
>> outage (in case of a clean shutdown (UPS) after power outage), Otherwise 
>> the BBB doesn't simply boot up. That can be a problem in case of remote 
>> installation. I don't see any warning in the wiki about this behavior 
>> It may be a hardware problem on my rather old BBB ver 5AC. Does anybody 
>> encountered the same issue ?
>       More likely, it is an antique image on the eMMC.
>       I believe it was only about a year or so ago that images were
> configured so that the eMMC boot-loader would look at and boot an installed
> SD card without needing the boot button.
>       Second, newer images are expecting u-Boot device tree (overlay)
> handling, whereas the older images put-off device tree overlay handling
> until Linux had booted.
>       You will probably need to obtain a 2GB image (I presume the "5AC" in
> your subject meant "A5C" version), verify that boots from SD card (using
> the button), convert to flasher image, flash the eMMC, remove SD card and
> verify unit boots from eMMC. 
>       THEN install your 4GB SD card image and see if the board now detects
> and boots from it without holding down the button.

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