diff --git a/src/board.h b/src/board.h
index cf1d29e590..2a8b51433c 100755
--- a/src/board.h
+++ b/src/board.h
@@ -28,10 +28,10 @@
 #include "drivers/sound_beeper.h"
 #include "boardalignment.h"
 #include "battery.h"
-#include "math.h"
 
 #ifdef FY90Q
  // FY90Q
+#include "drivers/accgyro_fy90q.h"
 #include "drivers/adc_common.h"
 #include "drivers/adc_fy90q.h"
 #include "drivers/bus_i2c.h"
diff --git a/src/build_config.c b/src/build_config.c
index f4940a04f8..2b9ba0d644 100644
--- a/src/build_config.c
+++ b/src/build_config.c
@@ -1,5 +1,7 @@
 #include "stdbool.h"
 #include "stdint.h"
+#include "stdlib.h"
+#include "stdarg.h"
 
 #include "platform.h"
 
@@ -11,6 +13,12 @@
 #include "battery.h"
 #include "config.h"
 
+#include "drivers/serial_common.h"
+#include "runtime_config.h"
+#include "printf.h"
+
+#include "build_config.h"
+
 #if MAX_MOTORS != MAX_SUPPORTED_MOTORS
 #error Motor configuration mismatch
 #endif
@@ -18,3 +26,34 @@
 #if MAX_SERVOS != MAX_SUPPORTED_SERVOS
 #error Servo configuration mismatch
 #endif
+
+
+#ifdef REQUIRE_CC_ARM_PRINTF_SUPPORT
+
+// gcc/GNU version
+static void _putc(void *p, char c)
+{
+    serialWrite(core.mainport, c);
+}
+
+void initPrintfSupport(void)
+{
+    init_printf(NULL, _putc);
+}
+
+#else
+
+// keil/armcc version
+int fputc(int c, FILE *f)
+{
+    // let DMA catch up a bit when using set or dump, we're too fast.
+    while (!isSerialTransmitBufferEmpty(core.mainport));
+    serialWrite(core.mainport, c);
+    return c;
+}
+
+void initPrintfSupport(void)
+{
+    // nothing to do
+}
+#endif
diff --git a/src/build_config.h b/src/build_config.h
index 55547f99de..2e0b75e8d7 100644
--- a/src/build_config.h
+++ b/src/build_config.h
@@ -3,6 +3,8 @@
 //#define SOFT_I2C // enable to test software i2c
 
 #ifndef __CC_ARM
-#define USE_LAME_PRINTF
-#define PRINTF_LONG_SUPPORT
+#define REQUIRE_CC_ARM_PRINTF_SUPPORT
+#define REQUIRE_PRINTF_LONG_SUPPORT
 #endif
+
+void initPrintfSupport(void);
diff --git a/src/drivers/accgyro_fy90q.h b/src/drivers/accgyro_fy90q.h
new file mode 100644
index 0000000000..a1de1b4da6
--- /dev/null
+++ b/src/drivers/accgyro_fy90q.h
@@ -0,0 +1,3 @@
+#pragma once
+
+void adcSensorInit(sensor_t *acc, sensor_t *gyro);
diff --git a/src/drivers/adc_common.h b/src/drivers/adc_common.h
index e33d6923f7..28b03d9356 100755
--- a/src/drivers/adc_common.h
+++ b/src/drivers/adc_common.h
@@ -10,6 +10,3 @@ typedef struct drv_adc_config_t {
 
 void adcInit(drv_adc_config_t *init);
 uint16_t adcGetChannel(uint8_t channel);
-#ifdef FY90Q
-void adcSensorInit(sensor_t *acc, sensor_t *gyro);
-#endif
diff --git a/src/main.c b/src/main.c
index 105901cc83..6221d9f0b1 100755
--- a/src/main.c
+++ b/src/main.c
@@ -4,6 +4,8 @@
 #include "rx.h"
 #include "telemetry_common.h"
 
+#include "build_config.h"
+
 core_t core;
 
 extern rcReadRawDataPtr rcReadRawFunc;
@@ -11,23 +13,6 @@ extern rcReadRawDataPtr rcReadRawFunc;
 // receiver read function
 extern uint16_t pwmReadRawRC(uint8_t chan);
 
-#ifdef USE_LAME_PRINTF
-// gcc/GNU version
-static void _putc(void *p, char c)
-{
-    serialWrite(core.mainport, c);
-}
-#else
-// keil/armcc version
-int fputc(int c, FILE *f)
-{
-    // let DMA catch up a bit when using set or dump, we're too fast.
-    while (!isSerialTransmitBufferEmpty(core.mainport));
-    serialWrite(core.mainport, c);
-    return c;
-}
-#endif
-
 int main(void)
 {
     uint8_t i;
@@ -38,9 +23,7 @@ int main(void)
     serialPort_t* loopbackPort2 = NULL;
 #endif
     systemInit();
-#ifdef USE_LAME_PRINTF
-    init_printf(NULL, _putc);
-#endif
+    initPrintfSupport();
 
     checkFirstTime(false);
     readEEPROM();
diff --git a/src/printf.c b/src/printf.c
index 85c36a009d..389288fba6 100644
--- a/src/printf.c
+++ b/src/printf.c
@@ -31,7 +31,6 @@
 
 #include <stdbool.h>
 #include <stdint.h>
-
 #include <stdarg.h>
 
 #include "build_config.h"
@@ -41,12 +40,12 @@
 
 #include "printf.h"
 
-#ifdef PRINTF_LONG_SUPPORT
+#ifdef REQUIRE_PRINTF_LONG_SUPPORT
 #include "typeconversion.h"
 #endif
 
 
-#ifdef USE_LAME_PRINTF
+#ifdef REQUIRE_CC_ARM_PRINTF_SUPPORT
 
 typedef void (*putcf) (void *, char);
 static putcf stdout_putf;
@@ -76,7 +75,7 @@ void tfp_format(void *putp, putcf putf, char *fmt, va_list va)
             putf(putp, ch);
         else {
             char lz = 0;
-#ifdef 	PRINTF_LONG_SUPPORT
+#ifdef 	REQUIRE_PRINTF_LONG_SUPPORT
             char lng = 0;
 #endif
             int w = 0;
@@ -88,7 +87,7 @@ void tfp_format(void *putp, putcf putf, char *fmt, va_list va)
             if (ch >= '0' && ch <= '9') {
                 ch = a2i(ch, &fmt, 10, &w);
             }
-#ifdef 	PRINTF_LONG_SUPPORT
+#ifdef 	REQUIRE_PRINTF_LONG_SUPPORT
             if (ch == 'l') {
                 ch = *(fmt++);
                 lng = 1;
@@ -98,7 +97,7 @@ void tfp_format(void *putp, putcf putf, char *fmt, va_list va)
             case 0:
                 goto abort;
             case 'u':{
-#ifdef 	PRINTF_LONG_SUPPORT
+#ifdef 	REQUIRE_PRINTF_LONG_SUPPORT
                     if (lng)
                         uli2a(va_arg(va, unsigned long int), 10, 0, bf);
                     else
@@ -108,7 +107,7 @@ void tfp_format(void *putp, putcf putf, char *fmt, va_list va)
                     break;
                 }
             case 'd':{
-#ifdef 	PRINTF_LONG_SUPPORT
+#ifdef 	REQUIRE_PRINTF_LONG_SUPPORT
                     if (lng)
                         li2a(va_arg(va, unsigned long int), bf);
                     else
@@ -119,7 +118,7 @@ void tfp_format(void *putp, putcf putf, char *fmt, va_list va)
                 }
             case 'x':
             case 'X':
-#ifdef 	PRINTF_LONG_SUPPORT
+#ifdef 	REQUIRE_PRINTF_LONG_SUPPORT
                 if (lng)
                     uli2a(va_arg(va, unsigned long int), 16, (ch == 'X'), bf);
                 else
@@ -171,4 +170,5 @@ void tfp_sprintf(char *s, char *fmt, ...)
     putcp(&s, 0);
     va_end(va);
 }
-#endif /* USE_LAME_PRINTF */
+
+#endif
diff --git a/src/serial_cli.c b/src/serial_cli.c
index f61dad1ed1..189d5ca041 100644
--- a/src/serial_cli.c
+++ b/src/serial_cli.c
@@ -61,11 +61,7 @@ static const char * const mixerNames[] = {
 // sync this with AvailableFeatures enum from board.h
 static const char * const featureNames[] = {
     "PPM", "VBAT", "INFLIGHT_ACC_CAL", "SERIALRX", "MOTOR_STOP",
-    "SERVO_TILT",
-#ifndef FY90Q
-    "SOFTSERIAL",
-#endif
-    "LED_RING", "GPS",
+    "SERVO_TILT", "SOFTSERIAL", "LED_RING", "GPS",
     "FAILSAFE", "SONAR", "TELEMETRY", "POWERMETER", "VARIO", "3D",
     NULL
 };
diff --git a/src/typeconversion.c b/src/typeconversion.c
index a0c6611fcf..376dd3726f 100644
--- a/src/typeconversion.c
+++ b/src/typeconversion.c
@@ -3,7 +3,7 @@
 
 #include "build_config.h"
 
-#ifdef PRINTF_LONG_SUPPORT
+#ifdef REQUIRE_PRINTF_LONG_SUPPORT
 
 void uli2a(unsigned long int num, unsigned int base, int uc, char *bf)
 {