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arch/arm: add the Neoverse-V3AE core

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This commit adds the Neoverse-V3AE (Automotive Enhanced) 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).

This CPU is present in NVIDIA Jetson Thor / Tegra T264 [6].

Note: at the time of this commit, the latest binutils v2.46 does not
include a Neoverse-V3AE support for its '-mcpu' option. See [7]. 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 [8] (first included in 2.38), and the oldest
Binutils version in Buildroot is 2.44.

[1] https://developer.arm.com/Processors/Neoverse%20V3AE
[2] https://developer.arm.com/documentation/101595/0002/The-Neoverse-V3AE--core/Neoverse-V3AE--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#l222
[5] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=7ca2a803c4a0d8e894f0b36625a2c838c54fb4cd
[6] https://www.nvidia.com/en-us/autonomous-machines/embedded-systems/jetson-thor/
[7] https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gas/config/tc-aarch64.c;h=cd76163488c48e45d43c35b2704d637999d51015;hb=3e93b95c3ae3f00a0283ddbab8029cbc07d96aff#l10833
[8] https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=3518022233e6b757c57d3deb7723fd91214fe036

Signed-off-by: Julien Olivain <ju.o@free.fr>
This commit is contained in:
Julien Olivain
2026-03-03 21:27:07 +01:00
parent 7e75792675
commit 3dbb2a0aaa
1 changed files with 7 additions and 0 deletions
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7
arch/Config.in.arm
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@@ -544,6 +544,12 @@ config BR2_neoverse_v3
select BR2_ARM_CPU_HAS_FP_ARMV8
select BR2_ARM_CPU_ARMV9A
select BR2_ARCH_NEEDS_GCC_AT_LEAST_15
config BR2_neoverse_v3ae
bool "neoverse-V3AE (aka poseidon)"
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_15
endchoice
config BR2_ARM_ENABLE_NEON
@@ -945,6 +951,7 @@ config BR2_GCC_TARGET_CPU
# armv9.2a
default "cortex-a720" if BR2_cortex_a720
default "neoverse-v3" if BR2_neoverse_v3
default "neoverse-v3ae" if BR2_neoverse_v3ae
config BR2_GCC_TARGET_ABI
default "aapcs-linux" if BR2_arm || BR2_armeb