Update some configs

config/examples/ADIMLab/Gantry v1/Configuration_adv.h

@@ -1014,17 +1014,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/FYSETC/Cheetah 1.2/BLTouch/Configuration_adv.h

@@ -1060,7 +1060,7 @@
   // Add an optimized binary file transfer mode, initiated with 'M28 B1'
   //#define BINARY_FILE_TRANSFER
 
-  #ifdef TARGET_LPC1768
+  #if HAS_SDCARD_CONNECTION
     /**
      * Set this option to one of the following (or the board's defaults apply):
      *

config/examples/FYSETC/Cheetah 1.2/base/Configuration_adv.h

@@ -1060,7 +1060,7 @@
   // Add an optimized binary file transfer mode, initiated with 'M28 B1'
   //#define BINARY_FILE_TRANSFER
 
-  #ifdef TARGET_LPC1768
+  #if HAS_SDCARD_CONNECTION
     /**
      * Set this option to one of the following (or the board's defaults apply):
      *

config/examples/FYSETC/F6_13/Configuration_adv.h

@@ -1014,17 +1014,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   #define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**