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The Buildroot user manual. Chapter 6. Buildroot configuration. All the configuration options in make *config have a help text. The make *config commands also offer a search tool. Read the help. message in the different frontend menus to know how to use it.
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Ctrl + f. The result of the search shows the help message of the matching items. In menuconfig, numbers in the left column provide a shortcut to the. Just type this number to directly jump to the. Although the menu structure and the help text of the entries should be. Cross- compilation toolchain.
A compilation toolchain is the set of tools that allows you to compile. It consists of a compiler (in our case, gcc). C standard library (for example.
Clibc). The system installed on your development station certainly already has. If you’re using a PC, your compilation. Under most Linux systems, the compilation toolchain uses. GNU libc (glibc) as the C standard library.
This compilation. The machine on. which it is running, and on which you’re working, is called the "host. The compilation toolchain is provided by your distribution, and. Buildroot has nothing to do with it (other than using it to build a.
As said above, the compilation toolchain that comes with your system. As. your embedded system has a different processor, you need a. For example, if your host system uses x. ARM, the regular compilation toolchain on your host. ARM. Buildroot provides two solutions for the cross- compilation toolchain. The internal toolchain backend, called Buildroot toolchain in.
The external toolchain backend, called External toolchain in. The choice between these two solutions is done using the Toolchain. Type option in the Toolchain menu. Once one solution has been. Internal toolchain backend.
The internal toolchain backend is the backend where Buildroot builds. This backend supports several C libraries.
Once you have selected this backend, a number of options appear. The. most important ones allow to. Change the version of the Linux kernel headers used to build the. This item deserves a few explanations.
In the process of. C library is being. This library provides the interface between userspace. Linux kernel. In order to know how to "talk". Linux kernel, the C library needs to have access to the. Linux kernel headers (i.
Since this interface is backward. Linux kernel headers used to build. Linux kernel you intend to run on your embedded system.
They only. need to have a version equal or older to the version of the Linux. If you use kernel headers that are more. Linux kernel you run on your embedded system, then. C library might be using interfaces that are not provided by. Linux kernel. Change the version of the GCC compiler, binutils and the C library.
Select a number of toolchain options (u. Clibc only): whether the.
RPC support (used mainly for NFS). C++ support or thread support. Depending on which options you choose.
Buildroot menus will change: many applications and libraries require. Most packages show a comment. If needed, you can further refine the u. Clibc. configuration by running make uclibc- menuconfig.
Note however that. Buildroot are tested against the default u. Clibc. configuration bundled in Buildroot: if you deviate from this. Clibc, some packages may no. It is worth noting that whenever one of those options is modified. See. Section 8. 2, “Understanding when a full rebuild is necessary”.
Advantages of this backend. Well integrated with Buildroot. Fast, only builds what’s necessary. Drawbacks of this backend. Rebuilding the toolchain is needed when doing make clean, which. If you’re trying to reduce your build time, consider.
External toolchain backend. External toolchain backend. The external toolchain backend allows to use existing pre- built.
Buildroot knows about a number of. Linaro for ARM. Code. Bench for ARM, x.
Power. PC, MIPS and Super. H. Blackfin toolchains. Analog Devices, etc.) and is capable of downloading them. Then, you have three solutions to use an external toolchain. Use a predefined external toolchain profile, and let Buildroot.
Buildroot already knows. Code. Sourcery, Linaro, Blackfin and Xilinx toolchains. Just select the toolchain profile in Toolchain from the. This is definitely the easiest solution. Use a predefined external toolchain profile, but instead of having. Buildroot download and extract the toolchain, you can tell Buildroot. Just. select the toolchain profile in Toolchain through the available.
Download toolchain automatically, and fill the. Toolchain path text entry with the path to your cross- compiling. Use a completely custom external toolchain. This is particularly. NG or with Buildroot. To do this, select the Custom toolchain solution in the.
Toolchain list. You need to fill the Toolchain path, Toolchain. External toolchain C library options. Then, you have. to tell Buildroot what your external toolchain supports.
If your. external toolchain uses the glibc library, you only have to tell. C++ or not and whether it has. RPC support. If your external toolchain uses the u. Clibc. library, then you have to tell Buildroot if it supports RPC. C++. At the beginning of the execution, Buildroot will tell you if. Our external toolchain support has been tested with toolchains from.
Code. Sourcery and Linaro, toolchains generated by. NG, and toolchains generated by. Buildroot itself. In general, all toolchains that support the. If not, do not hesitate to contact the. We do not support toolchains or SDK generated by Open.
Embedded or. Yocto, because these toolchains are not pure toolchains (i. C and C++ libraries). Instead these toolchains. Therefore, Buildroot cannot import the sysroot of the. Buildroot. We also do not support using the distribution toolchain (i. C library installed by your distribution) as the.
This is because your. C/C++ library), so we cannot import it properly into the Buildroot. So even if you are building a system for a x.
Buildroot or crosstool- NG. If you want to generate a custom toolchain for your project, that can. Buildroot, our recommendation is. NG. We. recommend to build the toolchain separately from Buildroot, and then.
Buildroot using the external toolchain backend. Advantages of this backend. Allows to use well- known and well- tested cross- compilation. Avoids the build time of the cross- compilation toolchain, which is. Linux system. Not limited to u. Clibc: glibc and eglibc toolchains are supported.
Drawbacks of this backend. If your pre- built external toolchain has a bug, may be hard to get a. Crosstool- NG. External toolchain wrapper. When using an external toolchain, Buildroot generates a wrapper program. In case you need to. BR2_DEBUG_WRAPPER to either one of: 0, empty or not set: no debug. On a Linux system, the /dev directory contains special files, called.
Linux kernel. Without these device. Linux. kernel. Under System configuration, /dev management, Buildroot offers four. The first solution is Static using device table. This is the old. classical way of handling device files in Linux. With this method. Buildroot therefore.
Buildroot source code. This file is processed when Buildroot. The. BR2_ROOTFS_STATIC_DEVICE_TABLE option allows to change the. Buildroot, or to add an additional. Buildroot during the build. So, if you use this method, and a.
BR2_ROOTFS_STATIC_DEVICE_TABLE to. For more. details about the format of the device table file, see. Chapter 2. 2, Makedev syntax documentation. The second solution is Dynamic using devtmpfs only. Linux kernel that has been.
When mounted in /dev, this virtual. This filesystem is not persistent across reboots: it is. Using devtmpfs requires the. CONFIG_DEVTMPFS and CONFIG_DEVTMPFS_MOUNT. When Buildroot is in. Linux kernel for your embedded device, it.
However, if you. build your Linux kernel outside of Buildroot, then it is your. Buildroot system will not boot). The third solution is Dynamic using devtmpfs + mdev. This method. also relies on the devtmpfs virtual filesystem detailed above (so. CONFIG_DEVTMPFS and. CONFIG_DEVTMPFS_MOUNT enabled in the kernel configuration still. Busy. Box that the kernel will call every time a.
Thanks to the /etc/mdev. Basically, it allows userspace to react on device addition. For more details about mdev and the syntax.
The fourth solution is Dynamic using devtmpfs + eudev. This. method also relies on the devtmpfs virtual filesystem detailed. It is a. more heavyweight solution than mdev, but provides higher. Linux distributions.
Systemd. For more details, see. Udev. The Buildroot developers recommendation is to start with the Dynamic. Dynamic using devtmpfs + mdev is usually a. Note that if systemd is chosen as init system, /dev management will. The init program is the first userspace program started by the. PID number 1), and is responsible for starting.
Buildroot allows to use three different types of init systems, which. System configuration, Init system. The first solution is Busy. Box. Amongst many programs, Busy. Box has. an implementation of a basic init program, which is sufficient.
Enabling the BR2_INIT_BUSYBOX will. Busy. Box will build and install its init program. This is. the default solution in Buildroot. The Busy. Box init program will. The syntax. of this file can be found in. Busy. Box inittab syntax is special: do not use a random inittab.
Internet to learn about Busy. Box. inittab). The default inittab in Buildroot is stored in. Apart from mounting a few important. S shell script, and start a getty program (which. The second solution is system.
V. This solution uses the old. Buildroot in. package/sysvinit. This was the solution used in most desktop. Linux distributions, until they switched to more recent. Upstart or Systemd. Busy. Box). The default inittab installed with this init.
The third solution is systemd. Linux. It does far more than traditional init.
D- Bus activation for starting services, offers on- demand starting. Linux control groups. D- Bus and services.
It is worth noting that systemd. For more details about systemd, see. Software/systemd. The solution recommended by Buildroot developers is to use the. Busy. Box init as it is sufficient for most embedded.