bye bye support for atmega 168, your flash space has overflowed

stepper.c

@@ -111,11 +111,7 @@ void st_buffer_line(int32_t steps_x, int32_t steps_y, int32_t steps_z, uint32_t
 // "The Stepper Driver Interrupt" - This timer interrupt is the workhorse of Grbl. It is  executed at the rate set with
 // config_step_timer. It pops blocks from the block_buffer and executes them by pulsing the stepper pins appropriately. 
 // It is supported by The Stepper Port Reset Interrupt which it uses to reset the stepper port after each pulse.
-#ifdef TIMER1_COMPA_vect
 SIGNAL(TIMER1_COMPA_vect)
-#else
-SIGNAL(SIG_OUTPUT_COMPARE1A)
-#endif
 {        
   // TODO: Check if the busy-flag can be eliminated by just disabeling this interrupt while we are in it
   
@@ -192,11 +188,7 @@ SIGNAL(SIG_OUTPUT_COMPARE1A)
 
 // This interrupt is set up by SIG_OUTPUT_COMPARE1A when it sets the motor port bits. It resets
 // the motor port after a short period (settings.pulse_microseconds) completing one step cycle.
-#ifdef TIMER2_OVF_vect
 SIGNAL(TIMER2_OVF_vect)
-#else
-SIGNAL(SIG_OVERFLOW2)
-#endif
 {
   // reset stepping pins (leave the direction pins)
   STEPPING_PORT = (STEPPING_PORT & ~STEP_MASK) | (settings.invert_mask & STEP_MASK); 

stepper_plan.h

@@ -24,11 +24,7 @@
 #include <inttypes.h>
 
 // Pick a suitable block-buffer size
-#ifdef __AVR_ATmega328P__
 #define BLOCK_BUFFER_SIZE 20   // Atmega 328 has one full kilobyte of extra RAM!
-#else
-#define BLOCK_BUFFER_SIZE 10
-#endif
 
 // This struct is used when buffering the setup for each linear movement "nominal" values are as specified in 
 // the source g-code and may never actually be reached if acceleration management is active.

wiring_serial.c

@@ -87,11 +87,7 @@ void serialFlush()
 	rx_buffer_head = rx_buffer_tail;
 }
 
-#ifdef USART_RX_vect
 SIGNAL(USART_RX_vect)
-#else
-SIGNAL(SIG_USART_RECV)
-#endif
 {
 	unsigned char c = UDR0;
 	int i = (rx_buffer_head + 1) % RX_BUFFER_SIZE;