🔨 BTT STM32G0B1RE xfer build (#24245)

ini/stm32f1.ini

@@ -138,6 +138,7 @@ upload_protocol             = jlink
 #
 [STM32F103Rx_creality_xfer]
 extends         = STM32F103Rx_creality
+build_flags     = ${STM32F103Rx_creality.build_flags} -DXFER_BUILD
 extra_scripts   = ${STM32F103Rx_creality.extra_scripts}
                   pre:buildroot/share/scripts/upload.py
 upload_protocol = custom

ini/stm32g0.ini

@@ -36,3 +36,13 @@ build_flags                 = ${stm32_variant.build_flags}
                             -DSTEP_TIMER_IRQ_PRIO=0
 upload_protocol             = stlink
 debug_tool                  = stlink
+
+#
+# Custom upload to SD via Marlin with Binary Protocol
+#
+[env:STM32G0B1RE_btt_xfer]
+extends         = env:STM32G0B1RE_btt
+build_flags     = ${env:STM32G0B1RE_btt.build_flags} -DXFER_BUILD
+extra_scripts   = ${env:STM32G0B1RE_btt.extra_scripts}
+                  pre:buildroot/share/scripts/upload.py
+upload_protocol = custom