By Alan Holt, Chi-Yu Huang
This practically-oriented textbook presents a transparent creation to different part elements of an working procedure and the way those interact. The easy-to-follow textual content covers the bootloader, kernel, filesystem, shared libraries, start-up scripts, configuration records and method utilities. The approach for construction every one part is defined intimately, guiding the reader during the technique of making a absolutely sensible GNU/Linux embedded OS. positive factors: provides a concise assessment of the GNU/Linux process, and an in depth evaluate of GNU/Linux filesystems; describes how you can construct an embedded process to run on a digital computing device, and to run natively on an exact processor; introduces the idea that of the compiler toolchain, demonstrating tips to advance a go toolchain in order that courses will be outfitted on a variety of various architectures; discusses the ARM-based systems BeagleBone and Raspberry Pi; explains the right way to construct OpenWRT firmware photographs for OMxP Open-mesh units and the Dragino MS14 series.
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Extra info for Embedded Operating Systems: A Practical Approach
Physical disk drives can be divided into (one or more) partitions and filesystems are allocated to partitions. In this chapter we will examine the filesystems in detail. We discuss the organisation of physical disks and how filesystems are mapped to disk partitions. © Springer-Verlag London 2014 A. -Y. 1 GNU/Linux File Space While primary storage (main memory) is accessible directly from a program, secondary storage is only accessible through kernel services. The part of the kernel that provides these services is called the filesystem.
Directories themselves are files, however, unlike “regular” files the kernel imposes a structure to their content. Directories contain a list of links to files (and other directories) in the filesystem. A collection of files and directories, along with associated meta data form a filesystem. Files that store user data are sometimes called regular files in order to distinguish them from other file objects in the filesystem. In addition to regular files and directories, other file objects can be accessed through the filesystem: Device files A device file or special file is a device driver interface.
Nevertheless, this is sufficient to demonstrate how we can access a device file just as we would with any regular file. release = dd_close }; We compile the ddev module using the make utility. 3 shows the content of Makefile. o Building modules, stage 2. 989856] initialised dummy device driver Find the assigned major number: $ grep ddev /proc/devices 256 ddev We create two instances of ddev in the /dev directory. While they have the same major number (same driver code) they have different minor numbers: $ sudo mknod /dev/ddev0 c 256 0 $ sudo mknod /dev/ddev1 c 256 1 Next we write a utility, ddio, to run in user space to access the driver.