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arch: add support for RISC-V 64-bit (riscv64) architecture

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This enables a riscv64 system to be built with a Buildroot generated
toolchain (gcc >= 7.x, binutils >= 2.30, glibc only).

This configuration has been used to successfully build a qemu-bootable
riscv-linux-4.15 kernel (https://github.com/riscv/riscv-linux.git).

Signed-off-by: Mark Corbin <mark.corbin@embecosm.com>
[Thomas:
 - simplify arch.mk.riscv by directly setting GCC_TARGET_ARCH
 - simplify glibc.mk changes by using GLIBC_CONF_ENV.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Mark Corbin
2018-09-12 11:22:54 +01:00
committed by Thomas Petazzoni
parent 03e2bad868
commit 9b3d52b400
9 changed files with 167 additions and 2 deletions
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6
toolchain/toolchain-buildroot/Config.in
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@@ -46,14 +46,16 @@ config BR2_TOOLCHAIN_BUILDROOT_GLIBC
BR2_aarch64_be || BR2_i386 || BR2_mips || \
BR2_mipsel || BR2_mips64 || BR2_mips64el|| \
BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le || \
BR2_sh || BR2_sparc64 || BR2_x86_64 || \
BR2_microblaze || BR2_nios2 || BR2_archs38
BR2_riscv || BR2_sh || BR2_sparc64 || \
BR2_x86_64 || BR2_microblaze || BR2_nios2 || \
BR2_archs38
depends on BR2_USE_MMU
depends on !BR2_STATIC_LIBS
depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10 || !BR2_powerpc64le
depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5 || !BR2_MIPS_NAN_2008
depends on !BR2_powerpc_SPE
depends on BR2_RISCV_ISA_RVA || !BR2_riscv
select BR2_TOOLCHAIN_USES_GLIBC
# our glibc.mk enables RPC support
select BR2_TOOLCHAIN_HAS_NATIVE_RPC