From 5aa4db0505aeabd2f612eb702443e35c92fbdbde Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Mon, 2 May 2016 16:00:44 +0300
Subject: [PATCH] docs/esp8266/general: Add more points to "Multitude of
 boards" section.

---
 docs/esp8266/general.rst | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/docs/esp8266/general.rst b/docs/esp8266/general.rst
index 966b8794f..887d964b1 100644
--- a/docs/esp8266/general.rst
+++ b/docs/esp8266/general.rst
@@ -10,4 +10,25 @@ There are multitude of modules and boards from different sources which carry
 ESP8266 chip. MicroPython tries to provide a generic port which would run on
 as many boards/modules as possible, but there may be limitations. Adafruit
 Feather HUZZAH board is taken as a reference board for the port (for example,
-testing is performed on it).
+testing is performed on it). If you have another board, please make sure you
+have datasheet, schematics and other reference materials for your board
+handy to look up various aspects of your board functioning.
+
+To make a generic ESP8266 port and support as many boards as possible,
+following design and implementation decision were made:
+
+* GPIO pin numbering is based on ESP8266 chip numbering, not some "logical"
+numbering of a particular board. Please have manual/pin diagram of your board
+handy to find correspondce between your board pins and actual ESP8266 pins.
+We also encourage users of various boards to share this mapping via MicroPython
+forum, with the idea to collect community-maintained reference materials
+eventually.
+
+* All pins which make sense to support, are supported by MicroPython
+(for example, we don't expose pins which are used to connect SPI flash
+are not exposed, as they're unlikely useful for anything else, and
+operating on them will lead to board lock-up). However, any particular
+board may expose only subset of pins. Consult your board reference manual.
+
+* Some boards may lack external pins/internal connectivity to support
+ESP8266 deepsleep mode.
-- 
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