By Alan Holt, Chi-Yu Huang
This practically-oriented textbook/reference presents a transparent advent to the various part elements of an working procedure and the way those paintings together.
The easy-to-follow textual content covers the bootloader, kernel, filesystem, shared libraries, start-up scripts, configuration records and method utilities. The strategy for construction each one part is defined intimately, guiding the reader during the means of making a totally sensible GNU/Linux embedded working system.
Topics and features:
* offers a concise review of the GNU/Linux approach, and a close evaluation of GNU/Linux filesystems
* Describes how one can construct an embedded procedure to run on a digital computer, and to run natively on an exact processor
* Introduces the concept that of the compiler toolchain, demonstrating the right way to improve a move toolchain in order that courses may be outfitted on more than a few diversified architectures
* Discusses the ARM-based structures BeagleBone and Raspberry Pi
* Explains tips on how to construct OpenWRT firmware pictures for OMxP Open-mesh units and the Dragino MS14 series
Ideal for undergraduate and graduate point scholars learning working platforms, the booklet also will end up to be hugely invaluable to pros enthusiastic about this quarter.
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Extra info for Embedded Operating Systems: A Practical Approach (Undergraduate Topics in Computer Science)
High latencies resulted from disk heads moving between inodes at the start of filesystem and data blocks located at the end. The Berkeley fast filesystem (FFS) divides the filesystem into chunks, so that inodes and associated data blocks are located in the same general proximity on the disk. This helps to minimise head 54 3 The Filesystem in Detail Fig. 2 The virtual filesystem movement and access latency. In fact the Berkeley FFS is now considered to be the Unix filesystem (UFS) rather than the original Unix filesystem.
Processes can respond to signals in three different ways: • Perform the default action. • Ignore the signal. • Catch the signal and run a function. The default action performed by a process when it receives a signal depends on the signal type. Most (like SIGKILL) cause the process to terminate. Others like SIGQUIT cause the process to terminate and generate a core dump. 5 Process Management 21 Start a process to sleep for 300 s (five min): $ ( sleep 300 ) If we wish to terminate the process before five min has elapsed, we can send the process a signal.
Even a small embedded GNU/Linux system will have a large number of files. It is important then, that the filesystem provides some method of organising files. Unix uses the concept of a directory to group files. Not only can regular files be grouped into directories but also other directories (subdirectories). The Unix file space, therefore, resembles an inverted hierarchical tree. Below, we introduce some Unix terms regarding directories: Root directory The directory at the top of the file space hierarchy is called the root directory which is referenced by a forward slash “/”.
Embedded Operating Systems: A Practical Approach (Undergraduate Topics in Computer Science) by Alan Holt, Chi-Yu Huang