[Buildroot] [PATCH 1/1] arch/arm: add the Cortex-A78 core

[Buildroot] [PATCH 1/1] arch/arm: add the Cortex-A78 core

[Julien Olivain]

This commit adds the Cortex-A78 core, which is a armv8.2a ISA.
See: [1] [2].

This CPU support was added in GCC 11. See [3] [4].

Buildroot commit 771da1dd9 "configs/nvidia_bf3_defconfig: new
defconfig" [5] added the first defconfig for a board including
this CPU.

[1] https://developer.arm.com/Processors/Cortex-A78
[2] https://developer.arm.com/documentation/101430/0102/Functional-description/Introduction/About-the-core
[3] https://gcc.gnu.org/gcc-11/changes.html
[4] https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/config/aarch64/aarch64-cores.def;hb=releases/gcc-11.1.0#l98
[5] https://gitlab.com/buildroot.org/buildroot/-/commit/771da1dd9b209adfb27d2dd344a4b2fdcc8bacc4

Signed-off-by: Julien Olivain <ju.o@free.fr>
---
 arch/Config.in.arm | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/Config.in.arm b/arch/Config.in.arm
index 219215d122..a11d581c43 100644
--- a/arch/Config.in.arm
+++ b/arch/Config.in.arm
@@ -466,6 +466,14 @@ config BR2_cortex_a76_a55
 	select BR2_ARM_CPU_HAS_FP_ARMV8
 	select BR2_ARM_CPU_ARMV8A
 	select BR2_ARCH_NEEDS_GCC_AT_LEAST_9
+config BR2_cortex_a78
+	bool "cortex-A78"
+	select BR2_ARM_CPU_HAS_ARM if !BR2_ARCH_IS_64
+	select BR2_ARM_CPU_HAS_NEON if !BR2_ARCH_IS_64
+	select BR2_ARM_CPU_HAS_THUMB2 if !BR2_ARCH_IS_64
+	select BR2_ARM_CPU_HAS_FP_ARMV8
+	select BR2_ARM_CPU_ARMV8A
+	select BR2_ARCH_NEEDS_GCC_AT_LEAST_11
 config BR2_neoverse_n1
 	bool "neoverse-N1 (aka ares)"
 	select BR2_ARM_CPU_HAS_ARM if !BR2_ARCH_IS_64
@@ -876,6 +884,7 @@ config BR2_GCC_TARGET_CPU
 	default "cortex-a75.cortex-a55"	if BR2_cortex_a75_a55
 	default "cortex-a76"	if BR2_cortex_a76
 	default "cortex-a76.cortex-a55"	if BR2_cortex_a76_a55
+	default "cortex-a78"	if BR2_cortex_a78
 	default "neoverse-n1"	if BR2_neoverse_n1
 	default "tsv110"	if BR2_tsv110
 	# armv8.4a
-- 
2.47.0

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Re: [Buildroot] [PATCH 1/1] arch/arm: add the Cortex-A78 core

[Thomas Petazzoni via buildroot]

On Sun,  3 Nov 2024 22:30:01 +0100
Julien Olivain <ju.o@free.fr> wrote:

> This commit adds the Cortex-A78 core, which is a armv8.2a ISA.
> See: [1] [2].
> 
> This CPU support was added in GCC 11. See [3] [4].
> 
> Buildroot commit 771da1dd9 "configs/nvidia_bf3_defconfig: new
> defconfig" [5] added the first defconfig for a board including
> this CPU.
> 
> [1] https://developer.arm.com/Processors/Cortex-A78
> [2] https://developer.arm.com/documentation/101430/0102/Functional-description/Introduction/About-the-core
> [3] https://gcc.gnu.org/gcc-11/changes.html
> [4] https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/config/aarch64/aarch64-cores.def;hb=releases/gcc-11.1.0#l98
> [5] https://gitlab.com/buildroot.org/buildroot/-/commit/771da1dd9b209adfb27d2dd344a4b2fdcc8bacc4
> 
> Signed-off-by: Julien Olivain <ju.o@free.fr>
> ---
>  arch/Config.in.arm | 9 +++++++++
>  1 file changed, 9 insertions(+)

Applied to master, thanks.

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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