OpenEmbedded BSP layer for Rockchip boards

About:
-----
	The purpose of this layer is to provide OpenEmbedded BSP support for
	Rockchip-based devices using upstream sources as much as possible.

Dependencies:
------------
	URI: git://git.openembedded.org/openembedded-core
	layers: meta
	branch: matched branches (e.g. master, sumo, ...)

	URI: git://git.yoctoproject.org/meta-arm
	layers: meta-arm, meta-arm-toolchain
	branch: matched branches (e.g. master, sumo, ...)

Status of supported boards:
--------------------------
	builds and boots wic image:
		nanopi-m4
		nanopi-m4-2gb
		rock-pi-e
		rock-pi-4a
		rock-pi-4b
		rock-pi-4c
		rock64
		tinker-board
		tinker-board-s
		vyasa-rk3288
		firefly-rk3288
		nanopi-r4s
		rock-5b
		nanopi-r2s
		nanopi-m4b
		rock-pi-s
		rock-5a
		roc-rk3328-cc
		roc-rk3308-cc
		orangepi-5-plus
		rock-3a
		rock-4c-plus
	builds:
		marsboard-rk3066
		radxarock
		rock2-square

Notes:
-----
	The latest ddr initializer for the rk3308 platform does not output
	diagnostic messages to uart0. This causes a bunch of gibberish to
	be printed to the console window which only becomes legible once
	the linux kernel starts. I.e. the console output of the ddr
	initialization routine, as well as u-boot is lost. An older
	version of this same binary blob does, however, support output to
	uart0 (making its diagnostic messages as well as u-boot available
	on the console). By default the build assumes the user would like
	to see these message and be able to have the option to interact
	with u-boot.

	IOW: for rk3308-based devices, an older version of rkbin is used.

	If, however, the user would prefer to use the latest binary ddr
	initializer from rkbin, simply set:

		RKBIN_RK3308_LATEST = "1"
	
	in the configuration (e.g. conf/local.conf).

Maintenance:
-----------
	Please send pull requests, patches, comments, or questions to the
	yocto-patches mailing list (yocto-patches@lists.yoctoproject.org)
	CCing the maintainer

	When sending patches, please make sure the email subject line includes
	"[meta-rockchip][PATCH]" and follow the community's patch submission
	guidelines, as described in:
		https://www.openembedded.org/wiki/Commit_Patch_Message_Guidelines
		https://www.openembedded.org/wiki/How_to_submit_a_patch_to_OpenEmbedded

	This can be configured within the repository with the following commands:

		git config sendemail.to yocto-patches@lists.yoctoproject.org
		git config sendemail.cc <your full email address>
		git config format.subjectprefix "meta-rockchip] [PATCH"

	Then, to send your most recent commit (i.e. just one patch),
	please use something like:

		git format-patch -M -1
		git send-email <your patch file>

Maintainer:
----------
	Trevor Woerner <twoerner@gmail.com>

Brief History:
-------------
	2014 April
		- originally started by Julien Chauveau
		- Romain Perier joins
	2014 Sep
		- Julien leaves
	2015 Aug
		- Trevor Woerner joins
	2017 Mar
		- developers from Rockchip fork this layer see:
			https://github.com/rockchip-linux/meta-rockchip.git
			http://rockchip.wikidot.com/yocto-user-guide
	2017 May
		- Romain leaves
	2018 Feb
		- Rockchip developers abandon their fork for buildroot
			http://opensource.rock-chips.com/wiki_Buildroot