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This commit adds the Neoverse-V2 core, which is an armv9.0a ISA. See: [1] [2]. This CPU support was added in GCC 13. See [3] [4] [5]. This CPU supports Aarch64 at all exception levels (EL0 to EL3). It also supports Aarch32 only in EL0 (user-space). This means it's technically possible to compile Aarch32 code. GCC has the support to do so. Since Buildroot recompiles a full system (ATF, Kernel, user-space) this support has limited value. This is why this CPU is limited to 64bit builds only. Note: at the time of this commit, the latest binutils v2.46 does not include a Neoverse-V2 support for its '-mcpu' option. See [6]. This is not an issue because gcc will call the "as" assembler with the relevant "-march=armv9-a+EXTENSION..." options. Binutils supports "armv9-a" since upstream commit [7] (first included in 2.38), and the oldest Binutils version in Buildroot is 2.44. [1] https://developer.arm.com/Processors/Neoverse%20V2 [2] https://developer.arm.com/documentation/102375/latest/ [3] https://gcc.gnu.org/gcc-13/changes.html#aarch64 [4] https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/config/aarch64/aarch64-cores.def;hb=releases/gcc-13.1.0#l184 [5] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=14d4b4fb12041dde1511262b926662929196c3fe [6] https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gas/config/tc-aarch64.c;h=cd76163488c48e45d43c35b2704d637999d51015;hb=3e93b95c3ae3f00a0283ddbab8029cbc07d96aff#l10833 [7] https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=d5007f0280d881a8add44e6a68a3f536e138244c Signed-off-by: Julien Olivain <ju.o@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 https://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