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'''CONTINUE AT YOUR OWN RISK!''' The suggested utility to program the SAM3U device is BOSSA has a ROM- see [http://wwwresident bootloader.shumatech.com/web/products/bossa] for details. Before proceedingThis means the bootloader is always present - unless the chip is damaged it can be run, install BOSSA for making the device almost "unbrickable". If you have trouble running the instructions on this webpage it's most likely an issue with your systemhost computer, and not an issue with the SAM3U being damaged.
==Entering Bootloader Mode==
If using Linux, you can use ''dmesg'' to verify the serial port was connected OK.
==Flashing Firmware Using BOSSA==
The suggested utility to program the device is BOSSA - see [http://www.shumatech.com/web/products/bossa] for details. Before proceeding, install BOSSA for your system.
Run BOSSA, and in the "File" point it to chipwhisperer\hardware\capture\chipwhisperer-lite\sam3u_fw\SAM3U_VendorExample\Debug\SAM3U_CW1173.bin from either your release or GIT. If you press the "Auto-Scan" button BOSSA should detect the ATSAM3U2 device. Note if you are using Windows it might take a few minutes to install the drivers - check the status, as until the drivers are fully loaded it won't detect the SAM3U device.
# Once this is done, press the Write button.
# Press Verify afterwards to confirm things worked.
# Press Exit to close out the program.
# Unplug & Replug the Micro-USB and you've got a working ChipWhisperer-Lite again, with the latest SAM3U firmware!
[[File:Bossa.png]]
==BOSSA Command Line==
On certain systems it may be easier to use the command-line version of BOSSA, called bossac. You can also build just this version if required (see instructions below).
You can also run the BOSSA utility at the command line, with an instruction like the following:
bossac -e -w -v -b /path/to/SAM3U_CW1173.bin
If you are on Linux, you may need to either fix permissions on the serial port, or run bossac as root/sudo. See below for details.
=== Linux-Specific Instructions ===
You may need to give yourself write permission for the serial port. This can be done on some systems easily by adding yourself to the <code>dialout</code> user group. For example, assuming your username was <code>cwuser</code>:
# <code>$ sudo usermod -a -G dialout cwuser</code>
# Log out and log back in again for changes to take effect.
You may also need to build bossac from sources, as the provided binary does not work with your system. Details of how to perform this are provided next:
To build BOSSA, it is recommended to use our simplified bossac repository, which only builds the command-line version. To build this perform these steps:
# Download [https://github.com/newaetech/BOSSA/archive/master.zip a copy of the GIT repo], or clone with <code>git clone git@github.com:newaetech/BOSSA.git</code> (see github.com/newaetech/bossa for the full repo).
# Unzip the directory if you downloaded the zip.
# Run <code>make</code>.
# The binary should be in <code>bin\bossac</code>.
