diff --git a/platformio.ini b/platformio.ini
index 8aff9ca..1a75656 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -33,10 +33,11 @@ board = m5stack-atom
 lib_deps =
         ${env.lib_deps}
 build_flags = -D BOARD_M5ATOM_CANUNIT
+upload_port = /dev/esp32
 
 [env:m5stickc-atom-canunit]
 board = m5stack-atom
 lib_deps =
         ${env.lib_deps}
 build_flags = -D BOARD_M5STICK_CANUNIT -D HAS_RTC -D HAS_M5LCD
-
+upload_port = /dev/esp32
diff --git a/tools/99-usb-serial.rules b/tools/99-usb-serial.rules
new file mode 100644
index 0000000..f1f7573
--- /dev/null
+++ b/tools/99-usb-serial.rules
@@ -0,0 +1 @@
+SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", SYMLINK+="esp32"