BugID:16699304:add README files for board\platform\drivers dir; dir board
+## Contents
+
+## Introduction
+supported boards' code here. It includes board init related codes.
+ * board init codes
+ * kernel config codes
+ * startup.c which include main function
+ * ld\scatter file
+ * peripheral drivers for this board
+
+### Features
+- board supported
+
+### Standand directories layout
+```sh
+|--board
+ |--xxx
+ |--config
+ | --board.h : board config file, define for user, such as uart port num Y
+ | --k_config.c : user's kernel hook and mm memory region define Y
+ | --k_config.h : kernel config file .h Y
+ | --partition_conf.c : board flash config file N
+ |--drivers : board peripheral driver N
+ |--startup
+ | --board.c : board config implement Y
+ | --startup.c : main entry file Y
+ |--xxx.ld : link script Y
+ |--aos.mk : board makefile Y
+ |--README
+```
### Supported Boards
* ARM
* C-Sky
* CK802
* [cb2210](./cb2210/README.md)
-* RISC-V
- * RISCY
- * [rv32m1_vega](./rv32m1_vega/README.md)
+
+### Dependencies
+
+## Reference
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