Contents
What is Kbuild in Linux?
kbuild is an assortment of scripts that are built-in inside the kernel’s sources, and the kernel build process does not depend on anything named kmk. The kernel build system depends only on the standard GNU make, and it takes care of compiling its own helper programs, most of which are located under scripts/ directory.
What does OBJ M mean?
1. From the Linux kernel documentation for obj-m: “$(obj-m) specifies object files that are built as kernel modules.”. There isn’t an obj-m+ . The + is part of the += operator to append to a variable. It can also be used to append subdirectories which will be entered recursively. –
Why do we need device tree?
A device tree (DT) is a data structure of named nodes and properties that describe non-discoverable hardware. A bootloader using DTO can maintain the system-on-chip (SoC) DT and dynamically overlay a device-specific DT, adding nodes to the tree and making changes to properties in the existing tree.
What is Makefile in Linux kernel?
The top Makefile is responsible for building two major products: vmlinux (the resident kernel image) and modules (any module files). It builds these goals by recursively descending into the subdirectories of the kernel source tree. The list of subdirectories which are visited depends upon the kernel configuration.
What is Kconfig in Linux?
KConfig is a selection-based configuration system originally developed for the Linux kernel. In this interface, the user selects the options and features desired, and saves a configuration file, which is then used as an input to the build process.
What is Obj Y in Makefile?
obj-y += something/ This means that kbuild should go into the directory “something”. Once it moves to this directory, it looks at the Makefile in “something” to decide what objects should be built. It is analogous to saying- go to the directory “something” and execute “make”
What is Obj in Makefile?
It is standard practice for every makefile to have a variable named objects , OBJECTS , objs , OBJS , obj , or OBJ which is a list of all object file names.
What is difference between Vmlinux and Vmlinuz?
The vmlinux is the uncompressed built kernel, vmlinuz is the compressed one, that has been made bootable. (Note both names vmlinux and vmlinuz look same except for last letter z). Generally, you don’t need to worry about vmlinux, it is just an intermediate step.