diff --git a/configs/metro-m4/README.txt b/configs/metro-m4/README.txt
index 829993ca83..d31069fc8d 100644
--- a/configs/metro-m4/README.txt
+++ b/configs/metro-m4/README.txt
@@ -42,7 +42,8 @@ STATUS
     Unfortunately, the board seems to have become unusable after the first
     NuttX image was written to FLASH.  I am unable to connect the JTAG
     debugger and so am dead in the water on this unless I get replacement
-    hardware.
+    hardware.  The primary JTAG problem seems to be that it is now unable
+    to halt the CPU.
 
 Unlocking FLASH
 ===============
diff --git a/configs/viewtool-stm32f107/README.txt b/configs/viewtool-stm32f107/README.txt
index ee082d3575..2fa7dd4860 100644
--- a/configs/viewtool-stm32f107/README.txt
+++ b/configs/viewtool-stm32f107/README.txt
@@ -732,7 +732,7 @@ MAX3421E Integration
     MOSI   J8  Pin 10  PA7/MOSI1   D11                MOSI (label CLK)
     INT#   J18 Pin 10  PA0         D9                 INT
     RST#   J18 Pin  8  PA1         D7                 MAX_RST
-    GPX                            D8                 GPX
+    GPX    J18 Pin  6  PC5         D8                 GPX (not used)
     VBUS   J18 Pin  2  5V          VIN                V_BUS
     3.3V   J8  Pin  7              N/C                VCC
     GND    J8  Pin  8              GND                GND (no label)
@@ -748,7 +748,7 @@ MAX3421E Integration
     MOSI   J8  Pin  4  PB15/MOSI2  D11                MOSI (label CLK)
     INT#   J18 Pin 10  PA0         D9                 INT
     RST#   J18 Pin  8  PA1         D7                 MAX_RST
-    GPX                            D8                 GPX
+    GPX    J18 Pin  6  PC5         D8                 GPX (not used)
     VBUS   J18 Pin  2  5V          VIN                V_BUS
     3.3V   J8  Pin  1              N/C                VCC
     GND    J8  Pin  2              GND                GND (no label)
diff --git a/configs/viewtool-stm32f107/src/stm32_max3421e.c b/configs/viewtool-stm32f107/src/stm32_max3421e.c
index 09afffb7d5..0cd562955b 100644
--- a/configs/viewtool-stm32f107/src/stm32_max3421e.c
+++ b/configs/viewtool-stm32f107/src/stm32_max3421e.c
@@ -231,6 +231,8 @@ static void max3421e_acknowledge(FAR const struct max3421e_lowerhalf_s *lower)
 static void max3421e_power(FAR const struct max3421e_lowerhalf_s *lower,
                            bool enable)
 {
+  /* We currently have no control over VBUS power */
+
 #ifdef CONFIG_VIEWTOOL_MAX3421E_PWR
   stm32_gpiowrite(GPIO_MAX3421E_PWR, enable);
 #endif
diff --git a/configs/viewtool-stm32f107/src/viewtool_stm32f107.h b/configs/viewtool-stm32f107/src/viewtool_stm32f107.h
index cc55bb479a..42ddbe0c6c 100644
--- a/configs/viewtool-stm32f107/src/viewtool_stm32f107.h
+++ b/configs/viewtool-stm32f107/src/viewtool_stm32f107.h
@@ -335,6 +335,7 @@
  * CS#    J8  Pin  6  PB12/NSS2 (For SPI2)
  * INT#   J18 Pin 10  PA0
  * RST#   J18 Pin  8  PA1
+ * GPX    J18 Pin  6  PC5 (not used)
  */
 
 #if defined(CONFIG_VIEWTOOL_MAX3421E_SPI1)
@@ -350,6 +351,8 @@
                              GPIO_EXTI | GPIO_PORTA | GPIO_PIN0)
 #define GPIO_MAX3421E_RST   (GPIO_OUTPUT | GPIO_CNF_OUTPP | GPIO_MODE_50MHz | \
                              GPIO_OUTPUT_CLEAR | GPIO_PORTA | GPIO_PIN1)
+#define GPIO_MAX3421E_GPX   (GPIO_INPUT | GPIO_CNF_INFLOAT | GPIO_MODE_INPUT | \
+                             GPIO_PORTC | GPIO_PIN5)
 
 /****************************************************************************
  * Public Functions
diff --git a/drivers/usbhost/usbhost_max3421e.c b/drivers/usbhost/usbhost_max3421e.c
index 160185a206..74b2bf817e 100644
--- a/drivers/usbhost/usbhost_max3421e.c
+++ b/drivers/usbhost/usbhost_max3421e.c
@@ -4875,11 +4875,7 @@ max3421e_usbhost_initialize(FAR const struct max3421e_lowerhalf_s *lower)
       goto errout_with_alloc;
     }
 
-  /* Drive Vbus +5V (the smoke test).
-   *
-   * REVISIT: Should be done elsewhere in order to support device self-
-   * powered mode?  How does the MAX3421E VBUS detect logic work?
-   */
+  /* Drive Vbus +5V (the smoke test). */
 
   lower->power(lower, true);
 
diff --git a/include/nuttx/usb/max3421e.h b/include/nuttx/usb/max3421e.h
index a762715799..b6f62c41f3 100644
--- a/include/nuttx/usb/max3421e.h
+++ b/include/nuttx/usb/max3421e.h
@@ -459,7 +459,8 @@ struct max3421e_lowerhalf_s
    *   attach      - Attach the interrupt handler to the GPIO interrupt
    *   enable      - Enable or disable the GPIO interrupt
    *   acknowledge - Acknowledge/clear any pending GPIO interrupt
-   *   power       - Enable or disable 5V VBUS power
+   *   power       - Enable or disable 5V VBUS power.  REVISIT:  Often a
+   *                 GPIO from the MAX3421E is used to control VBUS power.
    */
 
   CODE int (*attach)(FAR const struct max3421e_lowerhalf_s *lower,
@@ -468,7 +469,7 @@ struct max3421e_lowerhalf_s
                       bool enable);
   CODE void (*acknowledge)(FAR const struct max3421e_lowerhalf_s *lower);
   CODE void (*power)(FAR const struct max3421e_lowerhalf_s *lower,
-                      bool enable);
+                     bool enable);
 
   /* Additional, driver-specific state data may follow */
 };