GD32F103TB (was: GD32F103CB)

[NIIBE Yutaka]

Hello, 

It was nice to meet you.  And thanks for your board with GD32F103TB, and
the chip of GD32F103TB.  Well, I didn't expected you are so young.  :-)

This morning, I successfully built and tested Gnuk 1.2.10 with the
board.

It just requires a change like this:

==========================
--- board-fst-01g.h	2018-01-19 22:12:38.736218579 +0900
+++ board-fst-01r.h	2018-05-12 06:11:11.687258627 +0900
@@ -1,12 +1,16 @@
-#define BOARD_NAME "FST-01G"
-#define BOARD_ID    0x8801277f
-/* echo -n "FST-01G" | sha256sum | sed -e 's/^.*\(........\)  -$/\1/' */
+#define BOARD_NAME "FST-01R"
+#define BOARD_ID    0x8e8266af
+/* echo -n "FST-01R" | sha256sum | sed -e 's/^.*\(........\)  -$/\1/' */
+
+#define MCU_STM32F1_GD32F1 1
+#define STM32_USBPRE                    STM32_USBPRE_DIV2
+#define STM32_ADCPRE                    STM32_ADCPRE_DIV8
 
 #define MCU_STM32F1 1
 #define STM32F10X_MD		/* Medium-density device */
 
 #define STM32_PLLXTPRE                  STM32_PLLXTPRE_DIV1
-#define STM32_PLLMUL_VALUE              6
+#define STM32_PLLMUL_VALUE              8
 #define STM32_HSECLK                    12000000
 
 #define GPIO_LED_BASE   GPIOB_BASE
--