diff --git a/config/simulavr.config b/config/simulavr.config
index 682f5cb..4aff6e8 100644
--- a/config/simulavr.config
+++ b/config/simulavr.config
@@ -1,4 +1,4 @@
-# CONFIG_LOW_LEVEL_OPTIONS is not set
+CONFIG_LOW_LEVEL_OPTIONS=y
 CONFIG_MACH_AVR=y
 # CONFIG_MACH_ATSAM is not set
 # CONFIG_MACH_ATSAMD is not set
@@ -12,25 +12,30 @@ CONFIG_MACH_AVR=y
 # CONFIG_MACH_SIMU is not set
 CONFIG_AVR_SELECT=y
 CONFIG_BOARD_DIRECTORY="avr"
-CONFIG_MACH_atmega2560=y
+# CONFIG_MACH_atmega2560 is not set
 # CONFIG_MACH_atmega1280 is not set
 # CONFIG_MACH_at90usb1286 is not set
 # CONFIG_MACH_at90usb646 is not set
 # CONFIG_MACH_atmega32u4 is not set
 # CONFIG_MACH_atmega1284p is not set
-# CONFIG_MACH_atmega644p is not set
+CONFIG_MACH_atmega644p=y
 # CONFIG_MACH_atmega328p is not set
 # CONFIG_MACH_atmega328 is not set
 # CONFIG_MACH_atmega168 is not set
-CONFIG_MCU="atmega2560"
-CONFIG_AVRDUDE_PROTOCOL="wiring"
-CONFIG_CLOCK_FREQ=16000000
+CONFIG_MCU="atmega644p"
+CONFIG_AVRDUDE_PROTOCOL="arduino"
+# CONFIG_AVR_FREQ_16000000 is not set
+CONFIG_AVR_FREQ_20000000=y
+# CONFIG_AVR_FREQ_8000000 is not set
+CONFIG_CLOCK_FREQ=20000000
 CONFIG_AVR_CLKPR=-1
 CONFIG_AVR_STACK_SIZE=256
 CONFIG_AVR_WATCHDOG=y
 CONFIG_SERIAL=y
-CONFIG_SERIAL_BAUD_U2X=y
+CONFIG_AVR_SERIAL_UART0=y
+# CONFIG_AVR_SERIAL_UART1 is not set
 CONFIG_SERIAL_PORT=0
+CONFIG_SIMULAVR=y
 CONFIG_SERIAL_BAUD=250000
 CONFIG_USB_VENDOR_ID=0x1d50
 CONFIG_USB_DEVICE_ID=0x614e
@@ -41,6 +46,7 @@ CONFIG_WANT_SENSORS=y
 CONFIG_WANT_SOFTWARE_I2C=y
 CONFIG_WANT_SOFTWARE_SPI=y
 CONFIG_CANBUS_FREQUENCY=1000000
+CONFIG_INITIAL_PINS=""
 CONFIG_HAVE_GPIO=y
 CONFIG_HAVE_GPIO_ADC=y
 CONFIG_HAVE_GPIO_SPI=y