[boards] Add BW15 board definition, update boardgen

boards/bw15/README.md

@@ -0,0 +1,43 @@
+# BW15
+
+*by Ai-Thinker Co., Ltd.*
+
+[Product page](https://docs.ai-thinker.com/_media/rtl8710/docs/bw15_datasheet_en.pdf)
+
+- [General info](../../docs/platform/realtek/README.md)
+- [Vendor datasheet](https://docs.ai-thinker.com/_media/rtl8710/docs/bw15_datasheet_en.pdf)
+
+Parameter    | Value
+-------------|--------------------------
+MCU          | RTL8720CF
+Manufacturer | Realtek
+Series       | AmebaZ2
+Frequency    | 100 MHz
+Flash size   | 2 MiB
+RAM size     | 256 KiB
+Voltage      | 3.0V - 3.6V
+I/O          | 13x GPIO, 8x PWM, 3x UART
+Wi-Fi        | 802.11 b/g/n
+BLE          | v4.2
+
+## Pinout
+
+![Pinout](pinout_bw15.svg)
+
+## Flash memory map
+
+Flash size: 2 MiB / 2,097,152 B / 0x200000
+
+Hex values are in bytes.
+
+Name            | Start    | Length            | End
+----------------|----------|-------------------|---------
+Partition Table | 0x000000 | 4 KiB / 0x1000    | 0x001000
+System Data     | 0x001000 | 4 KiB / 0x1000    | 0x002000
+Calibration     | 0x002000 | 4 KiB / 0x1000    | 0x003000
+(reserved)      | 0x003000 | 4 KiB / 0x1000    | 0x004000
+Boot Image      | 0x004000 | 32 KiB / 0x8000   | 0x00C000
+OTA1 Image      | 0x00C000 | 992 KiB / 0xF8000 | 0x104000
+OTA2 Image      | 0x104000 | 992 KiB / 0xF8000 | 0x1FC000
+Key-Value Store | 0x1FC000 | 8 KiB / 0x2000    | 0x1FE000
+User Data       | 0x1FE000 | 8 KiB / 0x2000    | 0x200000