diff --git a/Makefile b/Makefile
index e6f76f552..aacd58e31 100644
--- a/Makefile
+++ b/Makefile
@@ -2,21 +2,11 @@
 
 JOBS = 4
 MAKE = make -j $(JOBS)
+SCONS = scons -Q -j $(JOBS)
 
-BOARDLOADER_BUILD_DIR = embed/boardloader/build
-BOOTLOADER_BUILD_DIR  = embed/bootloader/build
-FIRMWARE_BUILD_DIR    = embed/firmware/build
-
-TREZORHAL_PORT_OPTS   = FROZEN_MPY_DIR=src DEBUG=1
-CROSS_PORT_OPTS       = MICROPY_FORCE_32BIT=1
-UNIX_PORT_OPTS        = MICROPY_PY_BTREE=0 MICROPY_PY_TERMIOS=0 MICROPY_PY_FFI=0 MICROPY_PY_USSL=0 MICROPY_SSL_AXTLS=0 DEBUG=1
-
-UNAME_S := $(shell uname -s)
-ifeq ($(UNAME_S),Darwin)
-UNIX_PORT_OPTS += MICROPY_FORCE_32BIT=0
-else
-UNIX_PORT_OPTS += MICROPY_FORCE_32BIT=1
-endif
+BOARDLOADER_BUILD_DIR = build/boardloader
+BOOTLOADER_BUILD_DIR  = build/bootloader
+FIRMWARE_BUILD_DIR    = build/firmware
 
 ## help commands:
 
@@ -34,7 +24,7 @@ res: ## update resources
 ## emulator commands:
 
 run: ## run unix port
-	cd src ; ../vendor/micropython/unix/micropython
+	cd src ; ../build/unix/micropython
 
 emu: ## run emulator
 	./emu.sh
@@ -58,18 +48,16 @@ style: ## run code style check on application sources
 build: build_boardloader build_bootloader build_firmware build_unix build_cross ## build all
 
 build_boardloader: ## build boardloader
-	$(MAKE) -f Makefile.boardloader $(TREZORHAL_PORT_OPTS)
+	$(SCONS) build/boardloader/boardloader.bin
 
 build_bootloader: ## build bootloader
-	$(MAKE) -f Makefile.bootloader $(TREZORHAL_PORT_OPTS)
-	./tools/binctl $(BOOTLOADER_BUILD_DIR)/bootloader.bin -s 1 4141414141414141414141414141414141414141414141414141414141414141
+	$(SCONS) build/bootloader/bootloader.bin
 
 build_firmware: res build_cross ## build firmware with frozen modules
-	$(MAKE) -f Makefile.firmware $(TREZORHAL_PORT_OPTS)
-	./tools/binctl $(FIRMWARE_BUILD_DIR)/firmware.bin -s 1 4141414141414141414141414141414141414141414141414141414141414141
+	$(SCONS) build/firmware/firmware.bin
 
 build_unix: ## build unix port
-	$(MAKE) -f ../../../embed/unix/Makefile -C vendor/micropython/unix $(UNIX_PORT_OPTS)
+	$(SCONS) build/unix/micropython
 
 build_cross: ## build mpy-cross port
 	$(MAKE) -C vendor/micropython/mpy-cross $(CROSS_PORT_OPTS)
@@ -79,18 +67,16 @@ build_cross: ## build mpy-cross port
 clean: clean_boardloader clean_bootloader clean_firmware clean_unix clean_cross ## clean all
 
 clean_boardloader: ## clean boardloader build
-	$(MAKE) -f Makefile.boardloader clean $(TREZORHAL_PORT_OPTS)
+	rm -rf build/boardloader
 
 clean_bootloader: ## clean bootloader build
-	$(MAKE) -f Makefile.bootloader clean $(TREZORHAL_PORT_OPTS)
+	rm -rf build/bootloader
 
 clean_firmware: ## clean firmware build
-	$(MAKE) -f Makefile.firmware clean $(TREZORHAL_PORT_OPTS)
+	rm -rf build/firmware
 
 clean_unix: ## clean unix build
-	$(MAKE) -f ../../../embed/unix/Makefile -C vendor/micropython/unix clean $(UNIX_PORT_OPTS)
-	# workaround for relative paths containing ../.. in unix Makefile
-	rm -rf vendor/micropython/micropython
+	rm -rf build/unix
 
 clean_cross: ## clean mpy-cross build
 	$(MAKE) -C vendor/micropython/mpy-cross clean $(CROSS_PORT_OPTS)
diff --git a/SConscript.bootloader b/SConscript.bootloader
index 488606ccf..739215f31 100644
--- a/SConscript.bootloader
+++ b/SConscript.bootloader
@@ -1,5 +1,7 @@
 # pylint: disable=E0602
 
+import os
+
 CCFLAGS_MOD = ''
 CPPPATH_MOD = []
 CPPDEFINES_MOD = []
@@ -100,7 +102,7 @@ SOURCE_TREZORHAL = [
     'embed/trezorhal/hal/stm32f4xx_ll_fsmc.c',
 ]
 
-env = Environment()
+env = Environment(ENV=os.environ)
 
 env.Replace(
     AS='arm-none-eabi-as',
@@ -142,6 +144,9 @@ env.Replace(
     ] + CPPDEFINES_MOD,
     ASPPFLAGS='$CFLAGS $CCFLAGS', )
 
+env.Replace(
+    BINCTL='tools/binctl', )
+
 #
 # Program objects
 #
@@ -163,5 +168,7 @@ program_elf = env.Command(
 program_bin = env.Command(
     target='bootloader.bin',
     source=program_elf,
-    action='$OBJCOPY -O binary -j .header -j .flash -j .data $SOURCE $TARGET',
-)
+    action=[
+        '$OBJCOPY -O binary -j .header -j .flash -j .data $SOURCE $TARGET',
+        '$BINCTL $TARGET -s 1 4141414141414141414141414141414141414141414141414141414141414141',
+    ], )
\ No newline at end of file
diff --git a/SConscript.firmware b/SConscript.firmware
index 9890cd5ec..ccf23314f 100644
--- a/SConscript.firmware
+++ b/SConscript.firmware
@@ -347,13 +347,11 @@ env.Replace(
 
 env.Replace(
     PYTHON='python',
-    PYTHONPATH='vendor/micropython/py',
-    MAKEQSTRDEFS='$PYTHON vendor/micropython/py/makeqstrdefs.py',
     MAKEQSTRDATA='$PYTHON vendor/micropython/py/makeqstrdata.py',
     MAKEVERSIONHDR='$PYTHON vendor/micropython/py/makeversionhdr.py',
-    MPY_CROSS='vendor/micropython/mpy-cross/mpy-cross',
     MPY_TOOL='$PYTHON vendor/micropython/tools/mpy-tool.py',
-    MAKE_FROZEN='$PYTHON vendor/micropython/tools/make-frozen.py', )
+    MPY_CROSS='vendor/micropython/mpy-cross/mpy-cross',
+    BINCTL='tools/binctl', )
 
 #
 # Micropython version
@@ -425,5 +423,7 @@ program_elf = env.Command(
 program_bin = env.Command(
     target='firmware.bin',
     source=program_elf,
-    action='$OBJCOPY -O binary -j .header -j .flash -j .data $SOURCE $TARGET',
-)
+    action=[
+        '$OBJCOPY -O binary -j .header -j .flash -j .data $SOURCE $TARGET',
+        '$BINCTL $TARGET -s 1 4141414141414141414141414141414141414141414141414141414141414141',
+    ], )