variants: add DevEBox H743VITX and H750VBT support

https://github.com/mcauser/MCUDEV_DEVEBOX_H7XX_M

Fixes #1145 and fixes #1266

Signed-off-by: Frederic Pillon <[email protected]>

Author: fpistm

Diff for: README.md

@@ -329,6 +329,7 @@ User can add a STM32 based board following this [wiki](https://github.com/stm32d
 | :green_heart: | STM32H742ZG<br>STM32H742ZI | Generic Board | *2.0.0* |  |
 | :green_heart: | STM32H743IG<br>STM32H743II | Generic Board | *2.0.0* |  |
 | :green_heart: | STM32H743VG<br>STM32H743VI | Generic Board | *2.0.0* |  |
+| :yellow_heart: | STM32H743VI | [DevEBox H743VIT6](https://github.com/mcauser/MCUDEV_DEVEBOX_H7XX_M) | **2.2.0** | |
 | :yellow_heart: | STM32H743VI | [WeAct MiniSTM32H743VIT6](https://github.com/WeActTC/MiniSTM32H7xx) | **2.2.0** | [More info](https://github.com/stm32duino/Arduino_Core_STM32/pull/1552) |
 | :green_heart: | STM32H743ZG<br>STM32H743ZI | Generic Board | *2.0.0* |  |
 | :green_heart: | STM32H747AG<br>STM32H747AI | Generic Board | *2.0.0* |  |
@@ -338,6 +339,7 @@ User can add a STM32 based board following this [wiki](https://github.com/stm32d
 | :green_heart: | STM32H750IB | [Daisy](https://www.electro-smith.com/daisy/daisy) | *1.9.0* |  |
 | :yellow_heart: | STM32H750IB | [Daisy Patch SM](https://www.electro-smith.com/daisy/patch-sm) | *2.2.0* |  |
 | :green_heart: | STM32H750VB | Generic Board | *2.0.0* |  |
+| :yellow_heart: | STM32H750VB | [DevEBox H750VBT6](https://github.com/mcauser/MCUDEV_DEVEBOX_H7XX_M) | **2.2.0** | |
 | :yellow_heart: | STM32H750VB | [WeAct MiniSTM32H750VBT6](https://github.com/WeActTC/MiniSTM32H7xx) | **2.2.0** | [More info](https://github.com/stm32duino/Arduino_Core_STM32/pull/1552) |
 | :green_heart: | STM32H753VI | Generic Board | *2.0.0* |  |
 | :green_heart: | STM32H753ZI | Generic Board | *2.0.0* |  |

Diff for: boards.txt

@@ -3748,6 +3748,26 @@ GenH7.menu.pnum.DAISY_PATCH_SM.build.variant=STM32H7xx/H742I(G-I)(K-T)_H743I(G-I
 GenH7.menu.pnum.DAISY_PATCH_SM.build.peripheral_pins=-DCUSTOM_PERIPHERAL_PINS
 GenH7.menu.pnum.DAISY_PATCH_SM.build.ldscript=DAISY_SEED.ld
 
+# DevEBoxH743VITX
+GenH7.menu.pnum.DevEBoxH743VITX=DevEBox H743VITX
+GenH7.menu.pnum.DevEBoxH743VITX.upload.maximum_size=2097152
+GenH7.menu.pnum.DevEBoxH743VITX.upload.maximum_data_size=524288
+GenH7.menu.pnum.DevEBoxH743VITX.build.board=DevEBoxH743VITX
+GenH7.menu.pnum.DevEBoxH743VITX.build.product_line=STM32H743xx
+GenH7.menu.pnum.DevEBoxH743VITX.build.variant=STM32H7xx/H742V(G-I)(H-T)_H743V(G-I)(H-T)_H750VBT_H753VI(H-T)
+GenH7.menu.pnum.DevEBoxH743VITX.build.variant_h=variant_DevEBoxH7xx.h
+GenH7.menu.pnum.DevEBoxH743VITX.build.peripheral_pins=-DCUSTOM_PERIPHERAL_PINS
+
+# DevEBoxH750VBTX
+GenH7.menu.pnum.DevEBoxH750VBTX=DevEBox H750VBTX
+GenH7.menu.pnum.DevEBoxH750VBTX.upload.maximum_size=131072
+GenH7.menu.pnum.DevEBoxH750VBTX.upload.maximum_data_size=524288
+GenH7.menu.pnum.DevEBoxH750VBTX.build.board=DevEBoxH750VBTX
+GenH7.menu.pnum.DevEBoxH750VBTX.build.product_line=STM32H750xx
+GenH7.menu.pnum.DevEBoxH750VBTX.build.variant=STM32H7xx/H742V(G-I)(H-T)_H743V(G-I)(H-T)_H750VBT_H753VI(H-T)
+GenH7.menu.pnum.DevEBoxH750VBTX.build.variant_h=variant_DevEBoxH7xx.h
+GenH7.menu.pnum.DevEBoxH750VBTX.build.peripheral_pins=-DCUSTOM_PERIPHERAL_PINS
+
 # WeAct MiniSTM32H743VITX
 GenH7.menu.pnum.WeActMiniH743VITX=WeAct MiniSTM32H743VITX
 GenH7.menu.pnum.WeActMiniH743VITX.upload.maximum_size=2097152