June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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The devices: /sys/devices
This is the kernel's view of the devices discovered since boot and how they are connected to each other. It is organized at the top level by the system bus, so what you see varies from one system to another. This is the QEMU emulation of the ARM Versatile:
# ls /sys/devicesplatform software system tracepoint virtual
There are three directories that are present on all systems:
- system/: This contains devices at the heart of the system, including CPUs and clocks.
- virtual/: This contains devices that are memory-based. You will find the memory devices that appear as /dev/null, /dev/random, and /dev/zero in virtual/mem. You will find the loopback device, lo, in virtual/net.
- platform/: This is a catch-all for devices ...
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