node-beagle-boot 

A node.js bootloader server running over usb connection for BeagleBone hardware which can transfer bootloader files, ramdisk etc. It can also boot it into usb mass storage mode utilising the uboot's ums feature for flashing purposes.

This project is developed during Google Summer of Code 2017 under BeagleBoard Organisation.

This project is a port of BBBlfs, a flashing app which integrates a bootloader server for BeagleBone Black written in C language to JavaScript (node.js)

This project differs from BBBlfs in the way of booting into usb mass storage mode. BBBlfs utilizes a Kernel/ Ramdisk approach for the same and this new tool will be using uboot's ums feature for the same purpose. See this video for more info about the project.

The ultimate goal for this project is to integrate this bootloader server to an etcher.io like tool to make a complete flashing tool for BeagleBone hardware.
#### Code for complete app here

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#### Working of the bootloader server
When the AM335x ROM is connected to PC by holding down boot switch, it exposes a RNDIS interface which is a virtual ethernet link over usb.
1. After running the server through API or start script, it listens to events of device connection.
2. Once it detects the device connection, it starts serving BOOTP, ARP requests and finally TFTP request for respective file transfer for the device.
3. For USB Mass Storage functionality first TFTP trasnfer of SPL(Secondary Program Loader) is done for ROM device. SPL runs in device.
4. Now, newly connected device shows up as SPL device. TFTP trasnfer of UBOOT (configured for USB mass storage) is performed for SPL device.
5. Then UBOOT runs and mounts the emmc of device as USB mass storage device.

Recommended node version 6+

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#### Ubuntu / Debian
1. These packages are required to build libusb on linux.
``
sudo apt-get install build-essential libudev-dev
`

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1. Connect BB through usb by holding down S2 (boot button).
2. Install am335x usb drivers through Zadig.
3. Open Zadig, select Options -> List all devices. Select AM335x usb from list and install WinUSB driver.

Installation for use as standalone Server for USB mass storage purpose

1. Clone this repo. cd into it.
2. Run command for installation
`
npm install
`
3. Run following command with sudo for Linux/OSX or elevated admin cmd or PowerShell for Windows.
`
npm start
`
4. The server should be running now.
5. Connect BB through usb by holding down S2 (boot button) to begin the process.

It should now boot BB into USB Mass Storage Mode.

API Documentation

___
#### For USB Mass Storage

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The returned EventEmitter instance emits following events:
* progress: A progress event that passes state object of form:
`
{
description: 'ARP request sent', // Current status
complete: 20 // Percent complete
}
`
* done: An event emitted after process success which passes nothing.
* error: An error event which passes error.
* connect: An event reporting device connect which passes string for device type (ROM, SPL, UMS) connected.
* disconnect: An event reporting device disconnect which passes string for device type (ROM, SPL, UMS) disconnected.

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___
`
var BB = require('beagle-boot');

var emitter = BB.usbMassStorage();

emitter.on('progress', function(status){
console.log(status);
});

emitter.on('done', function(){
console.log('Transfer Complete');
});

emitter.on('error', function(error){
console.log('Error: '+error);
});

emitter.on('connect', function(device){
if(device === 'UMS') console.log('Ready for Flashing!');
});

emitter.on('disconnect', function(device){
console.log(device + ' device got disconnected');
});
`
___
#### For any File transfer to respective device


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This EventEmitter instance emits the same above events.
#### file transfer objects are of following form:
`
{
vid: vID, // Device Vendor ID as integer
pid: pID, // Device Product ID as integer
file_path: 'path' // Path of file to be transferred
}
`
The order of objects doesn't matter here

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`
var BB = require('beagle-boot');

var emitter = BB.tftpServer([
{vid: 0x0451, pid: 0x6141, file_path: './bin/spl'},
{vid: 0x525, pid: 0xa4a2, file_path: './bin/uboot'}
]);
``
#### This API can be used to boot ramdisk also
#### Infact above usbMassStorage function server is implemented using this any file transfer API