Altering the bootloader script

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来自 University of California San Diego 的课程

物联网：设置 DragonBoard™ 开发平台

147 个评分

University of California San Diego

物联网：设置 DragonBoard™ 开发平台

147 个评分

Do you want to develop skills to prototype mobile-enabled products using state-of-the-art technologies? In this course you will build a hardware and software development environment to guide your journey through the Internet of Things specialization courses. We will use the DragonBoard™ 410c single board computer (SBC). This is the first in a series of courses where you will learn both the theory and get the hands-on development practice needed to prototype Internet of Things products. This course is suitable for a broad range of learners. This course is for you if: • You want to develop hands-on experience with mobile technologies and the Internet • You want to pivot your career towards the design and development of Internet of Things enabled products • You are an entrepreneur, innovator or member of a DIY community Learning Goals: After completing this course, you will be able to: 1. Configure at least one integrated development environment (IDE) for developing software. 2. Make use of git, adb and fastboot to flash multiple OS and repair bricked boards. 3. Install Android 5.1 (Lollipop) and Linux based on Ubuntu. 4. Create, compile and run a Hello World program. 5. Describe the DragonBoard™ 410c peripherals, I/O expansion capabilities, Compute (CPU and Graphics) capabilities, and Connectivity capabilities.

从本节课中

Changing your Operating System

The DragonBoard™ 410c is capable of running a variety of different operating systems, that being said you are free to chose the operating system that you find is best fit for you. Now, we understand that there is a diverse user base for this board and would like to cover as much as possible in this lesson so everyone can enjoy it! Whether you are a Windows user or a Mac user, or prefer Android over Ubuntu, there is a video or two here for you! In this lesson we will help you choose an operating system to best fit for your needs, we will then cover the download, flashing and installation process for all currently available operating systems. Because of the diverse nature of this board we will teach you multiple ways to flash your new operating system and provide a pro's and con's list for the different methods. By the end of this lesson switching between operating system will be easy and exciting for users of all skill levels.

Introduction to Lesson 2c0:57

Download Android binaries/bootloader2:10

Altering the bootloader script6:30

Fastboot Flash onto eMMC4:05

A look back at Lesson 2c1:13

与讲师见面

Ganz Chockalingam
Principal Engineer
Qualcomm Institute of Calit2, UC, San Diego
Harinath Garudadri
Associate Research Scientist
Qualcomm Institute of Calit2, UC, San Diego

Hey everyone, so at this point,

we're gonna show you how to do two really important things.

The first we're gonna show you is how to create a path variable,

these things can be used for anything you want.

So a path variable is a tool that will allow you to go straight to a file without

having to go to through all the previous files.

So you don't have to traverse folder by folder,

you can just go straight to your destination using the path variable.

The second thing we're gonna show you how to do is, how to modify a script.

Now, a script will allow you to execute multiple commands on the command line,

by just executing the script.

So you dont have to go one by one with each command there.

And so Robert here, we're gonna jump to his screen and

he's gonna show you exactly how to do all that.

>> Yeah, first off,

like to touch on what we kinda covered at the very end of the last video.

In the last video we downloaded a bunch of files.

Now, all of those files you need to make sure that you have those unzipped.

And if you wanna stay a little organized like I like to do is,

I made a little folder here on my desktop and called it android.

I moved all of my files that I downloaded into the boot loader file, and

then I placed it into this nice, little, conveniently named android folder.

We'll go over that in a little bit, but

first off I wanna create this path variable that Yukresh was talking about.

So, let's take a look at the terminal here.

And for Macs, you're going to need to execute this commands right here.

So I kind of have a little generic one right there that I pasted up there.

But let's create one for us.

Particularly for where I can my FASTBOOT located.

Now for me, I'm gonna go export and I wanna call mine with lower case fastboot.

And you will see why I do this later.

But I'm gonna set my fastboot variable equal to the home directory.

And then I'm going to my, not Desktop, I'm gonna go to my Library.

Within my Library I have a folder called android this

is just where I put my fastboot.

Inside my android folder, I have my sdk and

inside there is the platform-tools and

once and for all the fastboot execute.

All right, so if I hit enter here I should have created

a path variable to that executable fastboot.

Now, that being said,

I mentioned that I put all of these files over here into this folder.

So, if we click this android here, and

this was the boot loader that I downloaded.

Now, inside that boot loader I told you I put all of those files that I unzipped.

Well here you can see that I have my boot, cache, persist,

recovery, system and userdata.

All of those were zipped, I unzipped them, put them in my boot loader file.

And you'll see why, because this little file right here,

this flashall file, is a very important executable script

that's given to us by the boot loader download.

Now what we're gonna do is we are gonna kind of guide our way into this folder

through the terminal here.

So lets do that.

So the folder I am in right now, you can see that I have Desktop right here.

I am going to cd into the Desktop because that is where my android

folder is located.

Now that I'm in the android location,

I can cd into that android and look what is in there.

That one extra folder that makes things extra difficult for me.

>> cd, dragonboard.

>> Oh, cd dragonboard.

>> There you go.

>> Okay, so now i'm in there right?

>> Yeah. >> Okay cool,

so you can see that little flashall folder.

I have a text editor that I like to use which is just vim,

all Macs should come with that.

>> All Macs have it.

>> But yeah so if I go into flashall you can see this script that was so

nicely given to us by 96 boards.

>> By 96 ports, yeah.

>> Yeah, so now what we wanna do is we wanna flash everything from here onto

the Dragonboard 410c.

In order to do we need to hit I, that allows me to insert.

But we need to include a little- >> $ there.

And as an you can see on the screen there, theres a bunch of commands there.

And each one is its own command but by putting it all executable,

you can just execute the executable.

And it'll just run the commands for you so you don't have to type each one out.

And the reason he's putting that $ in front of that fastboot is,

if you remember back to when we made that path variable,

we created a path variable called fastboot and it was all in lowercase.

So here your gonna see that the fastboot path variable is also in lowercase.

And by putting a $ we're actually calling that path variable.

So $ goes to that path variable, calls on the fastboot executable,

calls on the function inside that executable flash and

flash is that the appropriate file is on.

>> One little extra step that we took here, was that,

like I said earlier, I said I unzipped these and threw these in this folder.

Well I want this to do a little more for me.

I know it's already gonna do a lot, but I want it to do more.

So what I did is I kind of wrote a little extra bit right here.

So you can see that I took these commands right here, and

they're erasing what's already on the board.

Well, I want to use those same commands to give me a little more.

And that's essentially going to erase everything and

then reflash all of these extra files here now.

If I didn't put this in here, you could just go individually and

flash one by one onto your board.

But this is gonna make things a little quicker.

So if you want, right now, you can pause the video and open up your flashall.

Copy this section over here onto your script.

And then what you do invent at least, and you can always look up these commands.

Oh yeah, actually, good point Yukresh.

So yeah, we also need to add these $ because it is a path variable.

So, let's get those in there real quick.

Should've included that in the copy paste part.

All right, so now that we got all that in there.

You can go online, look up vin commands.

But yeah, so basically your gonna hit escape.

Then you're gonna do colon and then w for write, and q for quit.

You can hit enter so you officially updated your flashall script

there to run all of the commands you want it to run.

>> Yep, yeah.

>> Yeah, so let's execute that.

>> Wait, so actually, we'll see you on the next video, and we'll actually show

you how to execute each of the files onto the thing, onto the dragging board.

>> I was kinda jumping the gun there, but yeah.

Okay, we'll see you next video.

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