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Currently the BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT option is only available to be selected by another config option. This option controls if the Linux build system should build the DTB itself, or if buildroot explicitly calls the Linux Makefile like "make something.dtb". My use case: I want to build an OpenRISC image with a custom device tree file. OpenRISC does not support appended DTBs, and I'm not using a bootloader, but link everything into a single kernel (vmlinux) image. The kernel option CONFIG_OPENRISC_BUILTIN_DTB allows me to specify a dtb file, which is typically located in the kernel source tree in arch/openrisc/boot/dts/NAME.dts. Since my dts file is not part of the upstream kernel, I have two options: either patch the kernel to include the DTS file, and then specify it using the CONFIG_OPENRISC_BUILTIN_DTB option. Or use buildroot's BR2_LINUX_KERNEL_CUSTOM_DTS_PATH config option to copy any DTS file to the kernel source tree, and then specify this file with CONFIG_OPENRISC_BUILTIN_DTB as before. However, the second option also requries the buildroot option BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT to be set, otherwise I end up with a "make -C kerneldir NAME.dts" call, which doesn't work (no such target exists). Currently the BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT option exists, but it's not visible/available. Simply making it available solves the problem for me nicely. Signed-off-by: Philipp Wagner <mail@philipp-wagner.com> [Arnout: add help text] Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches