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This commit adds the Neoverse-V3 core, which is an armv9.2a ISA. See: [1] [2]. This CPU support was added in GCC 15. See [3] [4] [5]. This CPU supports Aarch64 only at all exception levels (EL0 to EL3). Note: at the time of this commit, the latest binutils v2.46 does not include a Neoverse-V3 support for its '-mcpu' option. See [6]. This is not an issue because gcc will call the "as" assembler with the relevant "-march=armv9.2-a+EXTENSION..." options. Binutils supports "armv9.2-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%20V3 [2] https://developer.arm.com/documentation/107734/0002/The-Neoverse--V3--core/Neoverse--V3--core-features [3] https://gcc.gnu.org/gcc-15/changes.html#aarch64 [4] https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/config/aarch64/aarch64-cores.def;hb=releases/gcc-15.1.0#l221 [5] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=729000b90300a31ef9ed405635a0be761c5e168b [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=3518022233e6b757c57d3deb7723fd91214fe036 Signed-off-by: Julien Olivain <ju.o@free.fr>