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Mastering Embedded Linux Programming

Mastering Embedded Linux Programming

By : Chris Simmonds
4.8 (20)
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Mastering Embedded Linux Programming

Mastering Embedded Linux Programming

4.8 (20)
By: Chris Simmonds

Overview of this book

Mastering Embedded Linux Programming takes you through the product cycle and gives you an in-depth description of the components and options that are available at each stage. You will begin by learning about toolchains, bootloaders, the Linux kernel, and how to configure a root filesystem to create a basic working device. You will then learn how to use the two most commonly used build systems, Buildroot and Yocto, to speed up and simplify the development process. Building on this solid base, the next section considers how to make best use of raw NAND/NOR flash memory and managed flash eMMC chips, including mechanisms for increasing the lifetime of the devices and to perform reliable in-field updates. Next, you need to consider what techniques are best suited to writing applications for your device. We will then see how functions are split between processes and the usage of POSIX threads, which have a big impact on the responsiveness and performance of the final device The closing sections look at the techniques available to developers for profiling and tracing applications and kernel code using perf and ftrace.
Table of Contents (16 chapters)
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15
Index

Configuring the network


Next, let's look at some basic network configurations so that we can communicate with the outside world. I am assuming that there is an Ethernet interface, eth0, and that we only need a simple IP v4 configuration.

These examples use the network utilities that are part of BusyBox, and are sufficient for a simple use case, using the old-but-reliable ifup and ifdown programs. You can read the man pages on both for more details. The main network configuration is stored in /etc/network/interfaces. You will need to create these directories in the staging directory:

etc/network
etc/network/if-pre-up.d
etc/network/if-up.d
var/run

For a static IP address, etc/network/interfaces would look like this:

auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
  address 10.0.0.42
  netmask 255.255.255.0
  network 10.0.0.0

For a dynamic IP address allocated using DHCP, etc/network/interfaces would look like this:

auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp

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