By Christopher Hallinan
Up-to-the-Minute, entire tips for constructing Embedded options with Linux
Linux has emerged as today’s number 1 working method for embedded items. Christopher Hallinan’s Embedded Linux Primer has confirmed itself because the definitive real-world consultant to construction effective, high-value, embedded structures with Linux. Now, Hallinan has completely up-to-date this hugely praised ebook for the latest Linux kernels, functions, instruments, and help, together with complicated multicore processors.
Drawing on greater than a decade of embedded Linux event, Hallinan is helping you speedily climb the educational curve, no matter if you’re relocating from legacy environments or you’re new to embedded programming. Hallinan addresses today’s most vital improvement demanding situations and demonstrates how you can clear up the issues you’re probably to come across.
You’ll the best way to construct a contemporary, effective embedded Linux improvement surroundings, after which put it to use as productively as attainable. Hallinan bargains updated information on every little thing from kernel configuration and initialization to bootloaders, machine drivers to dossier platforms, and BusyBox utilities to real-time configuration and process research. This version provides totally new chapters on UDEV, USB, and open resource construct platforms.
* travel the common embedded approach and improvement setting and comprehend its suggestions and components.
* comprehend the Linux kernel and userspace initialization processes.
* Preview bootloaders, with particular emphasis on U-Boot.
* Configure the reminiscence know-how units (MTD) subsystem to interface with flash (and different) reminiscence devices.
* utilize BusyBox and most up-to-date open resource improvement tools.
* examine from increased and up-to-date assurance of kernel debugging.
* construct and examine real-time platforms with Linux.
* learn how to configure equipment documents and motive force loading with UDEV.
* stroll via specified insurance of the USB subsystem.
* Introduces the most recent open resource embedded Linux construct systems.
* Reference appendices comprise U-Boot and BusyBox commands.
Read or Download Embedded Linux Primer: A Practical Real-World Approach (2nd Edition) PDF
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Additional resources for Embedded Linux Primer: A Practical Real-World Approach (2nd Edition)
This includes things such as memory size, clock speeds, onboard devices, buses, and Flash layout. Next, the bootm (boot from memory image) command is issued, to instruct U-Boot to boot the kernel we just loaded from the address speciﬁed by the tftp command. In this example of using the bootm command, we instruct U-Boot to load the kernel that we put at 0x600000 and pass the device tree binary (dtb) we loaded at 0xc00000 to the kernel. This command transfers control to the Linux kernel. Assuming that your kernel is properly conﬁgured, this results in booting the Linux kernel to a console command prompt on your target board, as shown by the login prompt.
You will often hear this referred to as process context within the kernel. In contrast, the interrupt service routine (ISR) handling the IDE drive (or any other ISR, for that matter) is kernel code that is not executing on behalf of any particular process. This is typically called interrupt context. Several limitations exist in this operational context, including the limitation that the ISR cannot block (sleep) or call any kernel functions that might result in blocking. For further reading on these concepts, consult the references at the end of this chapter.
The goal of this exercise is not to delve into the details of the kernel initialization (this is covered in Chapter 5, “Kernel Initialization”). The goal is to gain a high-level understanding of what is happening and what components are required to boot a Linux kernel on an embedded system. LISTING 2-3 Linux Final Boot Messages ... 9 VFS: Mounted root (nfs filesystem). 86 booting ... freescale-8548cds login: Shortly before issuing a login prompt on the serial terminal, Linux mounts a root ﬁle system.