Refactor f103,f072,f042 based keyboards to use new MCU selection defaults (#7705)

* refactor keyboards using ST_STM32F072B_DISCOVERY to use 'MCU = STM32F072'

* refactor keyboards using GENERIC_STM32_F042X6 to use 'MCU = STM32F042'

* refactor keyboards using GENERIC_STM32_F103 to use 'MCU = STM32F103'

1 files changed, 2 insertions, 34 deletions

diff --git a/keyboards/retro_75/rules.mk b/keyboards/retro_75/rules.mk
index 82a2cfb06..d3ead7f64 100644
--- a/keyboards/retro_75/rules.mk
+++ b/keyboards/retro_75/rules.mk
@@ -1,37 +1,5 @@
-## chip/board settings
-# the next two should match the directories in
-#  <chibios>/os/hal/ports/$(MCU_FAMILY)/$(MCU_SERIES)
-MCU_FAMILY = STM32
-MCU_SERIES = STM32F0xx
-# linker script to use
-# it should exist either in <chibios>/os/common/ports/ARMCMx/compilers/GCC/ld/
-#  or <this_dir>/ld/
-MCU_LDSCRIPT = STM32F072xB
-# startup code to use
-# is should exist in <chibios>/os/common/ports/ARMCMx/compilers/GCC/mk/
-MCU_STARTUP = stm32f0xx
-# it should exist either in <chibios>/os/hal/boards/
-#  or <this_dir>/boards
-BOARD = ST_STM32F072B_DISCOVERY
-# Cortex version
-# Teensy LC is cortex-m0; Teensy 3.x are cortex-m4
-MCU  = cortex-m0
-# ARM version, CORTEX-M0/M1 are 6, CORTEX-M3/M4/M7 are 7
-ARMV = 6
-# If you want to be able to jump to bootloader from firmware on STM32 MCUs,
-# set the correct BOOTLOADER_ADDRESS. Either set it here, or define it in
-# ./bootloader_defs.h or in ./boards/<FOO>/bootloader_defs.h (if you have
-# a custom board definition that you plan to reuse).
-# If you're not setting it here, leave it commented out.
-# It is chip dependent, the correct number can be looked up here (page 175):
-# http://www.st.com/web/en/resource/technical/document/application_note/CD00167594.pdf
-# This also requires a patch to chibios:
-#   <tmk_dir>/tmk_core/tool/chibios/ch-bootloader-jump.patch
-#STM32_BOOTLOADER_ADDRESS = 0x1FFFC800
-
-# Options to pass to dfu-util when flashing
-DFU_ARGS = -d 0483:df11 -a 0 -s 0x08000000:leave
-DFU_SUFFIX_ARGS = -p df11 -v 0483
+# MCU name
+MCU = STM32F072
 
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