Update README.md

Author: ladyada

README.md

@@ -5,26 +5,22 @@ for Atmel's SAMD21 and SAMD51 processor (used on the Arduino/Genuino Zero, MKR10
 
 In particular, this adds support for the Adafruit SAMD Boards such as the Feather M0
 
-## Installation on Arduino IDE
+## ATSAMD51 Installation on Arduino IDE
 
-This is a detailed process for now!
+The ATSAMD51 is a significantly new chip, so this is a detailed process for now! For the SAMD21, please install via the board manager (no extra steps required)
 
 1. Install Arduino IDE 1.8.5 or greater
-2. Remove the Adafruit SAMD board support package if you have installed it
-3. make a folder in your ArduinoSketchFolder called "hardware", then make a folder "hardware/Adafruit"
-4. in "hardware/Adafruit" git clone https://github.com/adafruit/ArduinoCore-samd, and rename the folder "samd"
-5. Check you now have "ArduinoSketcheFolderName/hardware/Adafruit/samd/boards.txt"
-6. git checkout samd51 from within the cloned repo, and check boards.txt contains "# Adafruit Metro M4 (SAMD51)"
-7. Now we need to update CMSIS! Download https://github.com/adafruit/ArduinoModule-CMSIS-Atmel/archive/master.zip and unzip
-8. Find your Arduino CMSIS, in Mac its "~/Library/Arduino15/packages/arduino/tools/CMSIS-Atmel/1.1.0/CMSIS" version # may vary, you'll need "Go to folder..." feature in the Finder to get to " ~/Library/Arduino15" as it is hidden. In Windows it is "C:\Users\yourusername\AppData\Local\Arduino15\packages\arduino\tools\CMSIS-Atmel\1.1.0\CMSIS" Inside is a folder named Device
+2. Install/update the Adafruit SAMD board support package if you have installed it
+3. Now we need to update CMSIS! Download https://github.com/adafruit/ArduinoModule-CMSIS-Atmel/archive/master.zip and unzip
+4. Find your Arduino CMSIS, in Mac its "~/Library/Arduino15/packages/arduino/tools/CMSIS-Atmel/1.1.0/CMSIS" version # may vary, you'll need "Go to folder..." feature in the Finder to get to " ~/Library/Arduino15" as it is hidden. In Windows it is "C:\Users\yourusername\AppData\Local\Arduino15\packages\arduino\tools\CMSIS-Atmel\1.1.0\CMSIS" Inside is a folder named Device
 
 For Linux: the Arduino stuff is located in ~/.arduino15/packages/arduino/tools/CMSIS-Atmel/1.1.0/CMSIS
 
-9. Inside the downloaded CMSIS zip, go into the CMSIS-Atmel/CMSIS folder, you should see a folder named Device. *DRAG THE DEVICE FOLDER ONLY* from the zip to your arduino Library folder so that Device is merged with Device. It will replace a bunch of files.
+5. Inside the downloaded CMSIS zip, go into the CMSIS-Atmel/CMSIS folder, you should see a folder named Device. *DRAG THE DEVICE FOLDER ONLY* from the zip to your arduino Library folder so that Device is merged with Device. It will replace a bunch of files.
 
 For Linux, it may be better to just delete the original Device Folder then copy over the new one - the drag/drop worked ok on MACOS, but not so well on my Linux box.  
 
-10. You will also need to replace bossac. For Windows or Mac: Go here https://github.com/adafruit/BOSSA/releases and download either windows exe or mac app of latest bossac. unzip.  Go to Step 12.
+6. You will also need to replace bossac. For Windows or Mac: Go here https://github.com/adafruit/BOSSA/releases and download either windows exe or mac app of latest bossac. unzip.  Go to Step 12.
 
 For Linux users it is best to build a copy of bossac locally - 
 clone the Adafruit Repostitory to somewhere on your local machine.
@@ -35,8 +31,8 @@ git checkout arduino
 ```
 Follow the instructions to build bossac in README.md or at https://github.com/adafruit/BOSSA/tree/arduino.
 
-11. Replace the binary at ".../Library/Arduino15/packages/arduino/tools/bossac/1.7.0/bossac" or "...\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.7.0\bossac"
-12. On Windows 7 you will also need to install the updated serial driver, download https://github.com/adafruit/Adafruit_Windows_Drivers/archive/master.zip to get all the drivers, and point the Device Manager to the unzipped folder. It isn't signed, so just approve the installation manually.
+7. Replace the binary at ".../Library/Arduino15/packages/arduino/tools/bossac/1.7.0/bossac" or "...\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.7.0\bossac"
+8. On Windows 7 you will also need to install the updated serial driver, download https://github.com/adafruit/Adafruit_Windows_Drivers/archive/master.zip to get all the drivers, and point the Device Manager to the unzipped folder. It isn't signed, so just approve the installation manually.
 13. That's it!
 
 ## Bugs or Issues