Adding OpenWrt support for MikroTik cAP ac

For Developers
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The main problem was in wrong pinout. I mistakenly thought if console reacts on key pressing in the terminal and produces some output this is TX. I was completely wrong: it was CPU RESET :slightly_smiling_face:. It's designed for in-circuit flash programming.

Serial console is enabled and I couldn't even imagine that it would be so easy!
In the RB3011UiAS-2HnD-IN topic I've found a link to lan23.ru that explains how to do it:

The lowest bit must be changed from 1 to 0 for the parameter with the 0x15 tag.
Example:

00 04 00 15 00 28 40 01
                      ↓
00 04 00 15 00 28 40 00

In my case it was:

A7 0B 0B 15 00 04 00 01
                      ↓
A7 0B 0B 15 00 04 00 00

Moreover: OpenWrt BOOTS NOW! :partying_face:
It runs with manually created DTS that I mentioned above. But I'm really new to DTS, never done this before, and I don’t understand almost everything that is written there :slight_smile:

I'll publish my results soon.

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