arch/arm: add armv8.2a cortex-based cores
The armv8.2a generation is a cumulative extension to armv8.1a. Since gcc correctly enables the appropriate extensions based on the core name, we don't really need to introduce a separate config for armv8.2a, and we can piggyback on armv8a. In theory, gcc supports those cores in arm mode. However, configuring gcc thusly generates a non-working gcc that constantly whines: cc1: warning: switch -mcpu=cortex-a55 conflicts with -march=armv8.2-a switch It is to be noted that the -march flag is internal to gcc. It is not something that Buildroot did set when configuring gcc; Buildroot only ever sets --with-cpu (not --with-arch). Additionally, uClibc fails to build entirely (unsure if this is caused by the above, or if it is a separate issue, though), with: #### Your compiler does not support TLS and you are trying to build uClibc-ng #### with NPTL support. Upgrade your binutils and gcc to versions which #### support TLS for your architecture. Do not contact uClibc-ng maintainers #### about this problem. Glibc and musl have not been tested in arm mode, so maybe we could have a toolchain that eventually works (or at least, pretends to be working), but we decided it was not worth the effort. Thus, we restrict those cores to AArch64 mode only. Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
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@ -451,6 +451,28 @@ config BR2_vulcan
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select BR2_ARCH_HAS_MMU_OPTIONAL
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select BR2_ARCH_NEEDS_GCC_AT_LEAST_7
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endif # BR2_ARCH_IS_64
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if BR2_ARCH_IS_64
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comment "armv8.2a cores"
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config BR2_cortex_a55
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bool "cortex-A55"
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select BR2_ARM_CPU_HAS_FP_ARMV8
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select BR2_ARM_CPU_ARMV8A
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select BR2_ARCH_HAS_MMU_OPTIONAL
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select BR2_ARCH_NEEDS_GCC_AT_LEAST_8
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config BR2_cortex_a75
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bool "cortex-A75"
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select BR2_ARM_CPU_HAS_FP_ARMV8
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select BR2_ARM_CPU_ARMV8A
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select BR2_ARCH_HAS_MMU_OPTIONAL
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select BR2_ARCH_NEEDS_GCC_AT_LEAST_8
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config BR2_cortex_a75_a55
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bool "cortex-A75/A55 big.LITTLE"
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select BR2_ARM_CPU_HAS_FP_ARMV8
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select BR2_ARM_CPU_ARMV8A
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select BR2_ARCH_HAS_MMU_OPTIONAL
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select BR2_ARCH_NEEDS_GCC_AT_LEAST_8
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endif # BR2_ARCH_IS_64
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endchoice
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config BR2_ARM_ENABLE_NEON
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@ -796,6 +818,10 @@ config BR2_GCC_TARGET_CPU
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default "thunderx2t99" if BR2_thunderx2t99
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default "thunderx2t99p1" if BR2_thunderx2t99p1
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default "vulcan" if BR2_vulcan
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# armv8.2a
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default "cortex-a55" if BR2_cortex_a55
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default "cortex-a75" if BR2_cortex_a75
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default "cortex-a75.cortex-a55" if BR2_cortex_a75_a55
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config BR2_GCC_TARGET_ABI
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default "aapcs-linux" if BR2_arm || BR2_armeb
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