To be able to effectively talk with a peripheral, we need to have a way to read and write within its registers and, to do that, we have two ways: by using I/O ports or by using I/O memory. The former mechanism is not covered in this book because it is not used so much in modern platforms (apart form x86 and x86_64 ones), while the latter just uses normal memory areas to map each peripheral register and is the one that is commonly used in modern CPUs. In fact, I/O memory mapping is really common in System-on-Chip (SoC) systems, where the CPU can talk to its internal peripherals just by reading and writing into well-known physical addresses; in this scenario, each peripheral has its own reserved address and each one is connected to a register.
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You're reading from Linux Device Driver Development Cookbook
Rodolfo Giometti is an engineer, IT specialist, GNU/Linux expert and software libre evangelist. He is the author of the books BeagleBone Essentials, BeagleBone Home Automation Blueprints and GNU/Linux Rapid Embedded Programming by Packt Publishing and maintainer of the LinuxPPS projects. He still actively contributes to the Linux source code with several patches and new device drivers for industrial applications devices. During his 20+ years of experience, he has worked on the x86, ARM, MIPS, and PowerPC-based platforms. Now, he is the co-chief at HCE Engineering S.r.l., where he designs new hardware and software systems for the quick prototyping in industry environment, control automation, and remote monitoring.
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Rodolfo Giometti is an engineer, IT specialist, GNU/Linux expert and software libre evangelist. He is the author of the books BeagleBone Essentials, BeagleBone Home Automation Blueprints and GNU/Linux Rapid Embedded Programming by Packt Publishing and maintainer of the LinuxPPS projects. He still actively contributes to the Linux source code with several patches and new device drivers for industrial applications devices. During his 20+ years of experience, he has worked on the x86, ARM, MIPS, and PowerPC-based platforms. Now, he is the co-chief at HCE Engineering S.r.l., where he designs new hardware and software systems for the quick prototyping in industry environment, control automation, and remote monitoring.
Read more about Rodolfo Giometti