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In the face of the vast amount of x86-64 CPU architecture variants, Linux distributions have worked together to define "micro-architecture levels" in the x86-64 psABI, called x86-64-v2, x86-64-v3 and x86-64-v4. They standardize a set of CPU features, and GCC since its version 11.x has support for these micro-architecture levels as -march= options. It makes sense to support them in Buildroot, especially for those who want to build toolchains that aim at targeting a reasonably broad family of x86-64 processors. It only really makes sense to use as 64-bit CPUs, and not as 32-bit ones, so we guard them behind BR2_x86_64. More details: https://gitlab.com/x86-psABIs/x86-64-ABI/-/blob/master/x86-64-ABI/low-level-sys-info.tex https://developers.redhat.com/blog/2021/01/05/building-red-hat-enterprise-linux-9-for-the-x86-64-v2-microarchitecture-level https://www.phoronix.com/scan.php?page=news_item&px=GCC-11-x86-64-Feature-Levels https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=59482fa1e7243bd905c7e27c92ae2b89c79fff87 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> [yann.morin.1998@free.fr: - they are x86-64-only CPUs - add gcc commit URL ] Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
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 OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches