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Mastering Embedded Linux Programming

You're reading from   Mastering Embedded Linux Programming Unleash the full potential of Embedded Linux with Linux 4.9 and Yocto Project 2.2 (Morty) Updates

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Product type Paperback
Published in Jun 2017
Publisher Packt
ISBN-13 9781787283282
Length 478 pages
Edition 2nd Edition
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Author (1):
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Mr. Chris Simmonds Mr. Chris Simmonds
Author Profile Icon Mr. Chris Simmonds
Mr. Chris Simmonds
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Table of Contents (17) Chapters Close

Preface 1. Starting Out FREE CHAPTER 2. Learning About Toolchains 3. All About Bootloaders 4. Configuring and Building the Kernel 5. Building a Root Filesystem 6. Selecting a Build System 7. Creating a Storage Strategy 8. Updating Software in the Field 9. Interfacing with Device Drivers 10. Starting Up – The init Program 11. Managing Power 12. Learning About Processes and Threads 13. Managing Memory 14. Debugging with GDB 15. Profiling and Tracing 16. Real-Time Programming

Using TFTP to load the kernel

Now that we know how to mount the root filesystem over a network using NFS, you may be wondering if there is a way to load the kernel, device tree, and initramfs over the network as well. If we could do this, the only component that needs to be written to storage on the target is the bootloader. Everything else could be loaded from the host machine. It would save time since you would not need to keep reflashing the target, and you could even get work done while the flash storage drivers are still being developed (it happens).

The Trivial File Transfer Protocol (TFTP) is the answer to the problem. TFTP is a very simple file transfer protocol, designed to be easy to implement in bootloaders such as U-Boot.

But, firstly, you need to install a TFTP daemon on your development machine. On Ubuntu, you could install the tftpd-hpa package, which, by default...

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