Update last note USER/BOOT/SD button

Author: Jason Kridner

START.htm

@@ -366,10 +366,9 @@ <h3>Step #5: Eject the SD card</h3>
     <p>Eject the newly programmed SD card.</p>
 
     <h3>Step #6: Boot your board off of the SD card</h3>
-    <p>Insert SD card into your (powered-down) board, hold down the USER/BOOT button (if using Black) and apply power, either by the USB cable or 5V adapter.</p>
-    <p>Insert SD card into your (powered-down) board, hold down the USER/BOOT button (if using Black) and apply power, either by the USB cable or 5V adapter.</p>
-    <p>If using a Beagle without on-board eMMC flash, you are done.</p>
-    <p>If using BeagleBone Black or another Beagle with on-board eMMC flash and desire to write the image to your on-board eMMC, you'll need to follow the instructions at <a href="http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Flashing_eMMC">http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Flashing_eMMC</a>. When the flashing is complete, all 4 USRx LEDs will be steady on or off. The latest Debian flasher images automatically power down the board upon completion.  <em>This can take up to 45 minutes.</em>  Power-down your board, remove the SD card and apply power again to finish.</p>
+    <p>Insert SD card into your (powered-down) board, hold down the USER/BOOT/SD button (if your board has one) and apply power.<em>Note: this button will change the ROM boot mode of the processor on you board to prevent it from loading code from the on-board flash. If the software on you board was fairly recent and functional, pressing this button is completely optional.</em></p>
+    <p>If using a Beagle without on-board flash, you are done.</p>
+    <p>If using BeagleBone Black or another Beagle with on-board flash and desire to write the image to your on-board flash, you'll need to follow the instructions at <a href="http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Flashing_eMMC">http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Flashing_eMMC</a>. When the flashing is complete, all 4 USRx LEDs will be steady on or off. The latest Debian flasher images automatically power down the board upon completion.  <em>This can take up to 45 minutes.</em>  Power-down your board, remove the SD card and apply power again to finish.</p>
 
     <h2 id="distros">Other currently available software images</h2>
     <p>Some of the starting images below involve multiple steps to produce an SD card image or otherwise change some of the steps above, so be sure to read all the instructions on their pages. Choose the starting point you want, download or produce the SD card image and follow the steps above.</p>