diff --git a/examples/arduino-blink-earlephilhower/platformio.ini b/examples/arduino-blink-earlephilhower/platformio.ini
index 5a41859..e205688 100644
--- a/examples/arduino-blink-earlephilhower/platformio.ini
+++ b/examples/arduino-blink-earlephilhower/platformio.ini
@@ -10,10 +10,15 @@
 [env]
 platform = raspberrypi
 framework = arduino
-board_build.core = earlephilhower
 
 [env:pico]
 board = pico
+; "pico" board can use both mbed and earlephilhower core, must select here
+board_build.core = earlephilhower
+
+; earlephilhower-only boards
+[env:rpipico]
+board = pico
 
 [env:nanorp2040connect]
 board = nanorp2040connect
@@ -22,4 +27,7 @@ board = nanorp2040connect
 board = adafruit_feather
 
 [env:seeed_xiao_rp2040]
-board = seeed_xiao_rp2040
\ No newline at end of file
+board = seeed_xiao_rp2040
+
+[env:sparkfun_thingplusrp2040]
+board = sparkfun_thingplusrp2040
\ No newline at end of file