Add Generic STM32F103Rx boards

Four variants available:
 * STM32F103R8T6
 * STM32F103RBT6
 * STM32F103RCT6
 * STM32F103RET6

Fixes #556

Co-authored-by: Paul Kourany <pkourany@users.noreply.github.com>
Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

README.md

@@ -101,8 +101,9 @@ User can add a STM32 based board following this [wiki](https://github.com/stm32d
 | :---: | --- | :---: | :--- |
 | :green_heart: | [BluePill F103C(6-8-B)](https://stm32-base.org/boards/STM32F103C8T6-Blue-Pill) | *1.2.0* | USB CDC support since *1.5.0*, Maple bootloaders support since *1.6.0* |
 | :green_heart: | [BlackPill F103C(8-B)](https://stm32-base.org/boards/STM32F103C8T6-Black-Pill) | *1.5.0* |  |
-| :green_heart: | MapleMini F103CB | *1.2.0* | USB CDC support since *1.5.0*, Maple bootloaders support since *1.6.0* |
+| :yellow_heart: | [Generic F103R(8-B-C-E)T6](https://stm32-base.org/boards/STM32F103RET6-Generic-Board) | **1.7.0** | Blue Button |
 | :green_heart: | HY-TinySTM103T | *1.5.0* |  |
+| :green_heart: | MapleMini F103CB | *1.2.0* | USB CDC support since *1.5.0*, Maple bootloaders support since *1.6.0* |
 
 | Status | Generic STM32F3xx | Release | Comment |
 | :---: | --- | :---: | :--- |

boards.txt

@@ -729,13 +729,34 @@ GenF1.menu.pnum.BLACKPILL_F103C8B.build.board=BLACKPILL_F103C8
 GenF1.menu.pnum.BLACKPILL_F103C8B.build.product_line=STM32F103xB
 GenF1.menu.pnum.BLACKPILL_F103C8B.build.variant=PILL_F103XX
 
-# MAPLEMINI_F103CB board
-GenF1.menu.pnum.MAPLEMINI_F103CB=Maple Mini F103CB
-GenF1.menu.pnum.MAPLEMINI_F103CB.upload.maximum_size=131072
-GenF1.menu.pnum.MAPLEMINI_F103CB.upload.maximum_data_size=20480
-GenF1.menu.pnum.MAPLEMINI_F103CB.build.board=MAPLEMINI_F103CB
-GenF1.menu.pnum.MAPLEMINI_F103CB.build.product_line=STM32F103xB
-GenF1.menu.pnum.MAPLEMINI_F103CB.build.variant=MAPLEMINI_F103CB
+# Generic STM32F103Rx boards (Blue button)
+GenF1.menu.pnum.Generic_F103R8T6=Generic F103R8T6 (Blue Button)
+GenF1.menu.pnum.Generic_F103R8T6.upload.maximum_size=65536
+GenF1.menu.pnum.Generic_F103R8T6.upload.maximum_data_size=20480
+GenF1.menu.pnum.Generic_F103R8T6.build.board=GENERIC_F103R8T6
+GenF1.menu.pnum.Generic_F103R8T6.build.product_line=STM32F103xB
+GenF1.menu.pnum.Generic_F103R8T6.build.variant=Generic_F103Rx
+
+GenF1.menu.pnum.Generic_F103RBT6=Generic F103RBT6 (Blue Button)
+GenF1.menu.pnum.Generic_F103RBT6.upload.maximum_size=131072
+GenF1.menu.pnum.Generic_F103RBT6.upload.maximum_data_size=20480
+GenF1.menu.pnum.Generic_F103RBT6.build.board=GENERIC_F103RBT6
+GenF1.menu.pnum.Generic_F103RBT6.build.product_line=STM32F103xB
+GenF1.menu.pnum.Generic_F103RBT6.build.variant=Generic_F103Rx
+
+GenF1.menu.pnum.Generic_F103RCT6=Generic F103RCT6 (Blue Button)
+GenF1.menu.pnum.Generic_F103RCT6.upload.maximum_size=262144
+GenF1.menu.pnum.Generic_F103RCT6.upload.maximum_data_size=49152
+GenF1.menu.pnum.Generic_F103RCT6.build.board=GENERIC_F103RCT6
+GenF1.menu.pnum.Generic_F103RCT6.build.product_line=STM32F103xE
+GenF1.menu.pnum.Generic_F103RCT6.build.variant=Generic_F103Rx
+
+GenF1.menu.pnum.Generic_F103RET6=Generic F103RET6 (Blue Button)
+GenF1.menu.pnum.Generic_F103RET6.upload.maximum_size=524288
+GenF1.menu.pnum.Generic_F103RET6.upload.maximum_data_size=65536
+GenF1.menu.pnum.Generic_F103RET6.build.board=GENERIC_F103RET6
+GenF1.menu.pnum.Generic_F103RET6.build.product_line=STM32F103xE
+GenF1.menu.pnum.Generic_F103RET6.build.variant=Generic_F103Rx
 
 # HY-TinySTM103TB board
 GenF1.menu.pnum.HY_TinySTM103TB=HY-TinySTM103TB
@@ -745,6 +766,14 @@ GenF1.menu.pnum.HY_TinySTM103TB.build.board=HY_TinySTM103TB
 GenF1.menu.pnum.HY_TinySTM103TB.build.product_line=STM32F103xB
 GenF1.menu.pnum.HY_TinySTM103TB.build.variant=HY_TinySTM103T
 
+# MAPLEMINI_F103CB board
+GenF1.menu.pnum.MAPLEMINI_F103CB=Maple Mini F103CB
+GenF1.menu.pnum.MAPLEMINI_F103CB.upload.maximum_size=131072
+GenF1.menu.pnum.MAPLEMINI_F103CB.upload.maximum_data_size=20480
+GenF1.menu.pnum.MAPLEMINI_F103CB.build.board=MAPLEMINI_F103CB
+GenF1.menu.pnum.MAPLEMINI_F103CB.build.product_line=STM32F103xB
+GenF1.menu.pnum.MAPLEMINI_F103CB.build.variant=MAPLEMINI_F103CB
+
 # Upload menu
 GenF1.menu.upload_method.swdMethod=STM32CubeProgrammer (SWD)
 GenF1.menu.upload_method.swdMethod.upload.protocol=0