I decided not to copy what was in the TRM into the SRM. That is why the SRM is 
specific to the BBB. And the TRM gets updated failry often by TI.

Gerald


From: beagleboard@googlegroups.com [mailto:beagleboard@googlegroups.com] On 
Behalf Of William Hermans
Sent: Saturday, May 20, 2017 8:00 PM
To: beagleboard@googlegroups.com
Subject: Re: [beagleboard] Re: Surefire PRU - Setup.

System reference manual SRM, Technical reference manual TRM.

On Sat, May 20, 2017 at 5:58 PM, William Hermans 
<yyrk...@gmail.com<mailto:yyrk...@gmail.com>> wrote:
No, prior to uboot overlays, overlays were loaded from the initrd, at best. 
Also we need to understand that the board file(also an overlay of sorts - but 
required )is seperate from all this discussion.

 I do not understand why you would have "field people" playing around with 
hardware overlays though. Once your hardware is finalized, it should never 
change. Which is one small reason why I personally find Universal IO 
unnecessary for my own purposes.
The problem I've seen with explanations, and documentation on device tree, is 
that no one explains it really well. Additionally, as a new player into device 
tree overlays. Its not clear where to get information from. See, you need to 
understand the pin-ctrl subsystem, gpio subsystem . . . list goes one, and on . 
. .A lot of this information has to be found from the Linux kernel source 
documentation.HOWEVER, you do not necessarily need to memorize all of this. We 
( programmers ) just need a reference that does not goes on, and on for days 
about silly details we do not need to know to get our jobs done. Nothing like 
this exists.
Anyway, in order to learn, you need to "do".

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