FreeBSD 11.3-RELEASE and 11.2-RELEASE images fail to boot on BeagleBone Black

[Sergey Manucharian]

Excerpts from Denis Polygalov's message from Sun 14-Jul-19 10:34:
>  > Yes, 12.0 works fine.
> 
> just for clarification, -
> FreeBSD-12.0-RELEASE-arm-armv7-BEAGLEBONE.img
> does *not* work for me (same behavior as 11.3 and 11.2).

Right now I have 2 BBBs running FreeBSD-12.0 for months, one of them 
has a working Newhaven 7" LCD cape (touchpanel doesn't work - there is 
no driver). I never needed any special tweaking to boot them.

There exist a few flavors of BBBs. I testify, that, e.g., black-board
industrial temperature BBBs have certain issues compared to red-board
ones.

Also, I discovered, that certain USB flash drives are not detected by
u-boot at boot time because of wrong timing, I had to recompile u-boot
to avoid such thing for my particular purpose. I know, it is not related
to your case, Denis, just an example. What if you try using a different
SD card? I know for sure that SanDisk cards of class 10 perfectly work
with all variants of BBBs I have.

The default DTB tells the kernel to set the SD card clock speed to
50MHz. It may be too high for certain types. I looked the clock's
waveform on the oscilloscope, it doesn't look good, believe me. I'm
involved in a commercial project with BBBs running Debian Linux, and 
to be on the safe side I lowered clock's speed to 25MHz.

-S