Merge nightly patches

Author: thinkyhead

Marlin/Configuration.h

@@ -1446,6 +1446,7 @@
 //#define EEPROM_SETTINGS     // Persistent storage with M500 and M501
 //#define DISABLE_M503        // Saves ~2700 bytes of PROGMEM. Disable for release!
 #define EEPROM_CHITCHAT       // Give feedback on EEPROM commands. Disable to save PROGMEM.
+#define EEPROM_BOOT_SILENT    // Keep M503 quiet and only give errors during first load
 #if ENABLED(EEPROM_SETTINGS)
   //#define EEPROM_AUTO_INIT  // Init EEPROM automatically on any errors.
 #endif

Marlin/Configuration_adv.h

@@ -753,8 +753,12 @@
 // Minimum time that a segment needs to take if the buffer is emptied
 #define DEFAULT_MINSEGMENTTIME        20000   // (ms)
 
-// If defined the movements slow down when the look ahead buffer is only half full
+// Slow down the machine if the look ahead buffer is (by default) half full.
+// Increase the slowdown divisor for larger buffer sizes.
 #define SLOWDOWN
+#if ENABLED(SLOWDOWN)
+  #define SLOWDOWN_DIVISOR 2
+#endif
 
 // Frequency limit
 // See nophead's blog for more info
@@ -999,7 +1003,7 @@
   #define BOOTSCREEN_TIMEOUT 4000        // (ms) Total Duration to display the boot screen(s)
 #endif
 
-#if HAS_GRAPHICAL_LCD && HAS_PRINT_PROGRESS
+#if HAS_GRAPHICAL_LCD && EITHER(SDSUPPORT, LCD_SET_PROGRESS_MANUALLY)
   //#define PRINT_PROGRESS_SHOW_DECIMALS // Show progress with decimal digits
   //#define SHOW_REMAINING_TIME          // Display estimated time to completion
   #if ENABLED(SHOW_REMAINING_TIME)
@@ -1008,7 +1012,7 @@
   #endif
 #endif
 
-#if HAS_CHARACTER_LCD && HAS_PRINT_PROGRESS
+#if HAS_CHARACTER_LCD && EITHER(SDSUPPORT, LCD_SET_PROGRESS_MANUALLY)
   //#define LCD_PROGRESS_BAR              // Show a progress bar on HD44780 LCDs for SD printing
   #if ENABLED(LCD_PROGRESS_BAR)
     #define PROGRESS_BAR_BAR_TIME 2000    // (ms) Amount of time to show the bar