OHOS built using Yocto / bitbake

Leveraging existing BSP base in Yocto meta-layers

Signed-off-by: Robert Drab <robert.drab@huawei.com>

adr/0002-use-yocto-bitbake-for-building-ohos.md

+# 2. Use Yocto / bitbake for building OHOS
+
+Date: 2020-12-01
+
+## Status
+
+Accepted
+
+## Context
+
+OHOS as a distributed operating system is designed to be hosted on 
+top of OS kernel. Currently Liteos-a (targeting ARM Cortex-A based devices) 
+and Liteos-m (targeting ARM Cortex-M based devices) kernels are supported.
+
+OHOS Liteos-A has BSP for only two ip cameras devices, whereas Liteos-M
+has BSP for only one wifi iot device. Qemu support is missing.
+
+## Decision
+
+To leverage existing BSPs OHOS will be made compatible with Yocto.
+We will start with Linux Poky distribution for ARM Cortex-A based devices
+and Zephyr for the Cortex-M based devices.
+
+## Consequences
+
+meta-ohos layer (when done properly) will enable nearly effortless porting 
+of OHOS to new kernels / distros.
+
+Decoupling of existing OHOS services from Liteos-A/M kernels has to be done.
+
+HQ modification to the OHOS stack between releases can require repeating
+decoupling works with each and every release if we're not aligned and in sync.

adr/adr-list.md

 # Architecture Decision Records
 
 * [1. Record architecture decisions](0001-record-architecture-decisions.md)
+* [2. Use Yocto / bitbake for building OHOS](0002-use-yocto-bitbake-for-building-ohos.md)