From efe7aa7ca47ba3e21032c69467519928bb4202a6 Mon Sep 17 00:00:00 2001 From: Julien Olivain Date: Tue, 3 Mar 2026 21:27:05 +0100 Subject: [PATCH] arch/arm: add the Neoverse-V2 core 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 --- arch/Config.in.arm | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/Config.in.arm b/arch/Config.in.arm index 16911f5b95..e9f3c53e0d 100644 --- a/arch/Config.in.arm +++ b/arch/Config.in.arm @@ -524,6 +524,12 @@ config BR2_neoverse_n2 select BR2_ARM_CPU_HAS_FP_ARMV8 select BR2_ARM_CPU_ARMV9A select BR2_ARCH_NEEDS_GCC_AT_LEAST_11 +config BR2_neoverse_v2 + bool "neoverse-V2 (aka demeter)" + depends on BR2_ARCH_IS_64 + select BR2_ARM_CPU_HAS_FP_ARMV8 + select BR2_ARM_CPU_ARMV9A + select BR2_ARCH_NEEDS_GCC_AT_LEAST_13 comment "armv9.2a cores" config BR2_cortex_a720 @@ -929,6 +935,7 @@ config BR2_GCC_TARGET_CPU # armv9.0a default "cortex-a710" if BR2_cortex_a710 default "neoverse-n2" if BR2_neoverse_n2 + default "neoverse-v2" if BR2_neoverse_v2 # armv9.2a default "cortex-a720" if BR2_cortex_a720