initial buildroot for linux 5.15

toolchain/toolchain-external/toolchain-external-arm-arm/Config.in

@@ -0,0 +1,31 @@
+comment "Arm toolchains available for Cortex-A with NEON + EABIhf"
+	depends on BR2_arm
+	depends on !BR2_ARM_CPU_ARMV7A || !BR2_ARM_EABIHF || !BR2_ARM_CPU_HAS_NEON
+	depends on !BR2_STATIC_LIBS
+
+config BR2_TOOLCHAIN_EXTERNAL_ARM_ARM
+	bool "Arm ARM 2021.07"
+	depends on BR2_arm
+	depends on BR2_ARM_CPU_ARMV7A || BR2_ARM_CPU_ARMV8A
+	depends on BR2_ARM_CPU_HAS_NEON
+	depends on BR2_HOSTARCH = "x86_64"
+	depends on BR2_ARM_EABIHF
+	depends on !BR2_STATIC_LIBS
+	select BR2_TOOLCHAIN_EXTERNAL_GLIBC
+	select BR2_TOOLCHAIN_HAS_SSP
+	select BR2_INSTALL_LIBSTDCPP
+	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_20
+	select BR2_TOOLCHAIN_GCC_AT_LEAST_10
+	select BR2_TOOLCHAIN_HAS_FORTRAN
+	select BR2_TOOLCHAIN_HAS_OPENMP
+	help
+	  Arm toolchain for the ARM architecture. It uses GCC 10.3,
+	  GDB 10.2, glibc 2.33, Binutils 2.36.1. It generates code
+	  that runs on all Cortex-A profile devices. The code
+	  generated uses the hard floating point calling convention,
+	  and uses the NEON FPU instructions.
+
+	  This is the same toolchain that was previously distributed by
+	  Linaro.
+
+	  https://developer.arm.com/open-source/gnu-toolchain

toolchain/toolchain-external/toolchain-external-arm-arm/Config.in.options

@@ -0,0 +1,9 @@
+if BR2_TOOLCHAIN_EXTERNAL_ARM_ARM
+
+config BR2_TOOLCHAIN_EXTERNAL_PREFIX
+	default "arm-none-linux-gnueabihf"
+
+config BR2_PACKAGE_PROVIDES_TOOLCHAIN_EXTERNAL
+	default "toolchain-external-arm-arm"
+
+endif

toolchain/toolchain-external/toolchain-external-arm-arm/toolchain-external-arm-arm.hash

@@ -0,0 +1,4 @@
+# From https://developer.arm.com/-/media/Files/downloads/gnu-a/10.3-2021.07/binrel/gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf.tar.xz.asc
+md5  87ec580b290df2febc7c476f59484635  gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf.tar.xz
+# locally calculated
+sha256  aa074fa8371a4f73fecbd16bd62c8b1945f23289e26414794f130d6ccdf8e39c  gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf.tar.xz

toolchain/toolchain-external/toolchain-external-arm-arm/toolchain-external-arm-arm.mk

@@ -0,0 +1,12 @@
+################################################################################
+#
+# toolchain-external-arm-arm
+#
+################################################################################
+
+TOOLCHAIN_EXTERNAL_ARM_ARM_VERSION = 2021.07
+TOOLCHAIN_EXTERNAL_ARM_ARM_SITE = https://developer.arm.com/-/media/Files/downloads/gnu-a/10.3-$(TOOLCHAIN_EXTERNAL_ARM_ARM_VERSION)/binrel
+
+TOOLCHAIN_EXTERNAL_ARM_ARM_SOURCE = gcc-arm-10.3-$(TOOLCHAIN_EXTERNAL_ARM_ARM_VERSION)-x86_64-arm-none-linux-gnueabihf.tar.xz
+
+$(eval $(toolchain-external-package))